Tda Modular Amp

Modular expandable power amplifier with TDA7293 / TDA7294

C9

C6

R6R7

C8

U1

C2

C3

R1

C1C5

R2

Conn4 Conn5

3 - Modular poweramp with TDA7293 and TDA7294

Document last modified and saved: 22 January 2012 5:42 PM

Schematics and Bill of materials for TDA amplifierSchematic and BOM of first (main) module

Schematics and BOM for modular TDA7293 amplifier

Schematics and BOM for modular TDA7293 amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Schematic and BOM of first (main) module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Schematic and BOM of second (bridge) module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Schematic and BOM of third (parallel) module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Schematic and BOM of speaker protection module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Three modes of TDA7293 from the official datasheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Simplified schematic of bridged and paralleled modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Connections between single, bridge and parallel modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Variations between main, bridge, and parallel modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

PCB for modular expandable TDA amplifier project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13PCB of main module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14PCB of bridge module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15PCB of parallel module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16PCB of speaker protection module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Examples how to connect modules and build instrument amplifiers . . . . . . . . . . . . . . . . . . . .18Mono bridge, single and parallel, stereo bridge and single amp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Stereo bridge + parallel, mono bridge + doubled parallel amp with speaker protection . . . . . . . . . . . . . . . . . . . . 20

More power with parallel modules up to 800W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22More power with 3 parallel modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Speaker protection schematic with PWM fan controller V:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Speaker protection PCB with PWM fan controller V:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Speaker protection schematic with PWM fan controller V:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Speaker protection PCB with PWM fan controller V:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

This project made for very simple and popular homemade amplifier instrument amplification . The gainclone called TDA7293 and 7294 is very good solution for guitar or microphone amplifiers . The poweramp can be connected to bridge, parallel, and bridge+parallel mode . This project contains 3 different PCBs for this integrated MOSFET

amplifier, and one PCB for speaker protection . Very easy to build, the output power is from 75W to 300W with one channel, but with this project possible to build stereo application . Popular guitar amplifier makers like Marshall and

Carlsbro using TDA729x ICs for combos and guitar heads .

English blog and PCB order: http://custompcb.blogspot.com/Hungarian blog and PCB order: http://diyguitarpa.blogspot.com/

The Youtube Channel Picasa gallery Email: [email protected]

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\TDA7293.SchDoc Drawn By:

TDA7293

STB-GND1

- IN2

+ IN3Slave GND 4

Clip Det. 5

Bootstrap 6

+V Sig

7-V Sig

8

STBY 9

Mute 10

Buff. Drv.11 Bootst. Loader 12

+V Pow

er13

Out 14

-V Pow

er15

U1

1000u 60VC2

1000u 60VC8

GND

GND

220nC1

220n

C9

22uC6

22kR7

680R1

GND

22kR6

GND

GND GND

10uC5

3 inp

ut co

nnec

tor

1

2

3

Conn1

GND

GND

10uC3

10uC4

GND GND

10kR3

22kR4

GND

+ V

- V

3 inp

ut co

nnec

tor

1

2

3

Conn6

GND

Out -

Out +

In 1

Buff. Drv.

22u

C7

30kR2

1N4148

D1

22kR5

220 R10BC212

T1 82k R9

6.8k

R8

1

2

2 inp

ut co

nnec

tor

Conn7

GND

3 inp

ut co

nnec

tor

1

2

3

Conn5

22uC10

TDA 7293/7294 Stage 1 (main module)

http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/

123456789

10

15x1

pin

conn

ector

1112131415

Conn4

123456789

10

15x1

pin

conn

ector

1112131415

Conn2

GND

Out -

Br. I/OSTBYMute- V+ V

B.S.B.L.

B.L. B.S.

MuteSTBY

In 2

56kR11

Bill of MaterialsTDA7293.SchDoc 12/12/2011 16:20:00

Comment Footprint Value Quantity Pins Designator Price Total PriceH Total HConnector 2 pin connector 100mil 2 input connector 1 2 Conn7 #VALUE! 20 20 FtCap CAP, 2 and 3 MIL 22u 1 2 C7 #VALUE! #VALUE!Cap Cap, Tantal, 1mil 10u 1 2 C5 #VALUE! #VALUE!NonPolarized Cap CAP, WIMA, 2MIL 220n 2 2 C1, C9 #VALUE! #VALUE!Diode Diode 1N4148 1 2 D1 #VALUE! 2 2 FtCap Elco 12 mm, 2 mil pins 1000u 60V 2 2 C2, C8 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 10u 2 2 C3, C4 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 22u 2 2 C6, C10 #VALUE! #VALUE!Header 15 pin Female connector FHSHR 15 15x1 pin connector 2 15 Conn2, Conn4 #VALUE! 10 20 FtConnector Panel Connector 3 input Small 3 input connector 3 3 Conn1, Conn5, Conn6 #VALUE! 44 132 FtResistor Resistor 300mil 10k 1 2 R3 #VALUE! 2 2 FtResistor Resistor 300mil 220 1 2 R10 #VALUE! 2 2 FtResistor Resistor 300mil 22k 4 2 R4, R5, R6, R7 #VALUE! 2 8 FtResistor Resistor 300mil 30k 1 2 R2 #VALUE! 2 2 FtResistor Resistor 300mil 56k 1 2 R11 #VALUE! 2 2 FtResistor Resistor 300mil 6.8k 1 2 R8 #VALUE! 2 2 FtResistor Resistor 300mil 680 1 2 R1 #VALUE! 2 2 FtResistor Resistor 300mil 82k 1 2 R9 #VALUE! 2 2 FtTDA7293 TDA7293 TDA7293 1 15 U1 #VALUE! #VALUE!PNP Transistor TO92 BC212 1 3 T1 #VALUE! #VALUE!

30 SUM: #VALUE! #VALUE!

Notes

This is the first and the most important module of this project . This module can be used alone for 1x75W or 2x75W amplification . The commercial amplifi-ers says 100W for this circuit what is not true . The output power is 7075w with 4 Ohm speakers, and about 4050w with 8 Ohm speakers . The maximum power supply is 50V, but 47V recommend-ed . The max . power of circuit called 7294 is 40V, with the 7293 possible to use 50V . If you need more power, dont increase the power supply, use bridge or parallel configuration instead . This module useful for both 7294 and 7293 . Only one thing must be changed, the C6 and C7 capacitor . For 7294 use ONLY C6 between output and Bootstrap pin, for 7293 use ONLY C7 between pin 6 and pin 12 . Use this rule for all other modules .

Conn1: Power supply, 47V for 7293, 40V for 7294Conn5: Left and Right audio level inputsConn7: Clipping LED connectorConn6: Simple (GND and Out+) and bridge

(Out+ and Out-) mode speaker outputs .

Modular poweramp with TDA7293 and TDA7294 - 4 5 - Modular poweramp with TDA7293 and TDA7294


Schematics and Bill of materials for TDA amplifierSchematic and BOM of second (bridge) module

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\TDA7293-BR-MOD.SchDocDrawn By:

TDA7293

STB-GND1

- IN2

+ IN3Slave GND 4

Clip Det. 5

Bootstrap 6

+V Sig

7-V Sig

8

STBY 9

Mute 10


+V Pow

er13

Out 14

-V Pow

er15

U1

1000u 60VC2

1000u 60VC8

GND

GND

220nC1

220n

C9

22uC6

22kR7

680R1

GND

22kR6

GND

GND GND

10u

C5

GND

+ V

- V

22u

C7

GND

GND

22uC3

TDA 7293/7294 Stage 2 (bridge module)


Out -

123456789

10

15x1

pin

conn

ector

1112131415

Conn4

123456789

10

15x1

pin

conn

ector

1112131415

Conn5

B.S.B.L.

B.L. B.S.

56k

R2

Bill of MaterialsTDA7293-BR-MOD.SchDoc 12/12/2011 16:12:03

Comment Footprint Value Quantity Pins Designator Price Total PriceH Total HCap CAP, 2 and 3 MIL 22u 1 2 C7 #VALUE! #VALUE!Cap Cap, Tantal, 1mil 10u 1 2 C5 #VALUE! #VALUE!NonPolarized Cap CAP, WIMA, 2MIL 220n 2 2 C1, C9 #VALUE! #VALUE!Cap Elco 12 mm, 2 mil pins 1000u 60V 2 2 C2, C8 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 22u 2 2 C3, C6 #VALUE! #VALUE!Header 15 pin Female connector FHSHR 15 15x1 pin connector 1 15 Conn5 #VALUE! 10 10 FtHeader 15 pin Male connector PHSR-15 (T-T) 15x1 pin connector 1 15 Conn4 #VALUE! 10 10 FtResistor Resistor 300mil 22k 2 2 R6, R7 #VALUE! 2 4 FtResistor Resistor 300mil 56k 1 2 R2 #VALUE! 2 2 FtResistor Resistor 300mil 680 1 2 R1 #VALUE! 2 2 FtTDA7293 TDA7293 TDA7293 1 15 U1 #VALUE! #VALUE!


Altium Limited Confidential 12/12/2011 Page 1

Notes

This is the bridge module of this project . This mod-ule can be connected to the right side of first (main) circuit . This module dupli-cate the output power with 8 ohm speakers . 4 Ohm speakers cannot be used with bridge amplifier .

Schematics and Bill of materials for TDA amplifierSchematic and BOM of third (parallel) module

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\TDA7293-PAR-MOD.SchDocDrawn By:

TDA7293

STB-GND1

- IN2

+ IN3Slave GND 4

Clip Det. 5

Bootstrap 6

+V Sig

7-V Sig

8

STBY 9

Mute 10


+V Pow

er13

Out 14

-V Pow

er15

U1

1000u 60VC2

1000u 60VC8

GND

GND

220nC1

220n

C9

GND

+ V

- V

GND

GND

22u

C7

TDA 7293/7294 Stage 3 (paralel module)


123456789

10

15x1

pin

conn

ector

1112131415

Conn1

123456789

10

15x1

pin

conn

ector

1112131415

Conn2

B.S.B.L.

Out +/-

B.L.

B.S.

56k

R6

B.S.B.L.

Bill of MaterialsTDA7293-PAR-MOD.SchDoc 12/12/2011 16:20:58

Comment Footprint Value Quantity Pins Designator Price Total PriceH Total HCap CAP, 2 and 3 MIL 22u 1 2 C7 #VALUE! #VALUE!NonPolarized Cap CAP, WIMA, 2MIL 220n 2 2 C1, C9 #VALUE! #VALUE!Cap Elco 12 mm, 2 mil pins 1000u 60V 2 2 C2, C8 #VALUE! #VALUE!Header 15 pin Female connector FHSHR 15 15x1 pin connector 1 15 Conn2 #VALUE! 10 10 FtHeader 15 pin Male connector PHSR-15 (T-T) 15x1 pin connector 1 15 Conn1 #VALUE! 10 10 FtResistor Resistor 300mil 56k 1 2 R6 #VALUE! 2 2 FtTDA7293 TDA7293 TDA7293 1 15 U1 #VALUE! #VALUE!


Altium Limited Confidential 12/12/2011 Page 1

Notes

This is the parallel module of this amplifier project . This mode can be con-nected to the right side of first (main) module to use with 4 ohm speakers, or can be connected to the second (bridge) module to use bridged amp with 4 ohm too . For parallel amplification use only TDA7293 only .

This module can be connected to the first (main) module, to the second (bridged) module, and if you need more power, can be connected to the first parallel module on the system to increase the output current.



1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 12/12/2011 Sheet ofFile: D:\!Works\..\Amp-Protection.SchDoc Drawn By:

11

UPC1237

22

33

44

55

66

77

88

U1

330uC1

GND

9.2k

R9

1N4148

D3

4.7uC4

GND

56k R7

6.8kR8

GND

10R2

22nC3

GND

1N4148

D2

35

1

46

2

7 8

Rel1

1 2 2 input connectorConn1

GND22k

R1

1 2 2 input connectorConn2

GND

1N4148D1

GND

123456789

10

15x1

pin con

nector

1112131415

Conn3

123456789

10

15x1

pin

conn

ector

1112131415

Conn4

33uC2

GND

GND

GND

3 input connector1 2 3

Conn5

GND

Dual Speker protection module


AC 24V+24V

In2

Bill of MaterialsAmp-Protection.SchDoc 12/12/2011 16:18:00

Comment Footprint Value Quantity Pins Designator Price Total PriceH Total HConnector 2 pin connector 100mil 2 input connector 1 2 Conn1 #VALUE! 20 20 FtNonPolarized Cap CAP, Ceramic, 1MIL 22n 1 2 C3 #VALUE! #VALUE!Diode Diode 1N4148 3 2 D1, D2, D3 #VALUE! 2 6 FtCap Elco 12 mm, 2 mil pins 330u 1 2 C1 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 33u 1 2 C2 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 4.7u 1 2 C4 #VALUE! #VALUE!Header 15 pin Male connector PHSR-15 (T-T) 15x1 pin connector 2 15 Conn3, Conn4 #VALUE! 10 20 FtConnector Panel Connector 2 input Small 2 input connector 1 2 Conn2 #VALUE! 20 20 FtConnector Panel Connector 3 input Small 3 input connector 1 3 Conn5 #VALUE! 44 44 FtRelay 2 Relay RE2L 24V DC 1 8 Rel1 #VALUE! #VALUE!Resistor Resistor 300mil 10 1 2 R2 #VALUE! 2 2 FtResistor Resistor 300mil 22k 1 2 R1 #VALUE! 2 2 FtResistor Resistor 300mil 56k 1 2 R7 #VALUE! 2 2 FtResistor Resistor 300mil 6.8k 1 2 R8 #VALUE! 2 2 FtResistor Resistor 300mil 9.2k 1 2 R9 #VALUE! 2 2 FtUPC1237 UPC1237 1 8 U1 #VALUE! #VALUE!


Notes

This is very simple and optional module for all configuration of this amplifier project . This module possible to use for all one channel mono and all two channels stereo configura-tions . This module (if used) must be connected between left and right channels . Connect the left side connector of speaker protection to the last module of left channel, connect right side connector to the first module of the main module of right channel . The Conn5 is used for 24V DC power, and for 24V AC input of UPC1237 . Conn1 is the LED connector for protection checking . Conn2 is for the high current relays, connect or disconnect the speakers from speaker outputs .

Warning

Make sure to use the schematic from the datasheet from 2003 . Slave mode is activated by pulling IN+, IN- and SGND to -Vs, the negative supply! In older versions from 1999 of the schematic slave mode is NOT activated prop-erly, which may lead according to reports on the internet to the destruction of the chip .

Schematics and Bill of materials for TDA amplifierSchematic and BOM of speaker protection module

Schematics and Bill of materials for TDA amplifierThree modes of TDA7293 from the official datasheet

Simple 7293 or 7294:

TDA7293

120V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIGH OPERATING VOLTAGE RANGE(50V)DMOS POWER STAGEHIGH OUTPUT POWER (100W @ THD =10%, RL = 8, VS = 40V)MUTING/STAND-BY FUNCTIONSNO SWITCH ON/OFF NOISEVERY LOW DISTORTIONVERY LOW NOISESHORT CIRCUIT PROTECTIONTHERMAL SHUTDOWNCLIP DETECTORMODULARITY (MORE DEVICES CAN BEEASILY CONNECTED IN PARALLEL TODRIVE VERY LOW IMPEDANCES)

DESCRIPTIONThe TDA7293 is a monolithic integrated circuit inMultiwatt15 package, intended for use as audioclass AB amplifier in Hi-Fi field applications(Home Stereo, self powered loudspeakers, Top-

class TV). Thanks to the wide voltage range andto the high out current capability it is able to sup-ply the highest power into both 4 and 8 loads.The built in muting function with turn on delaysimplifies the remote operation avoiding switchingon-off noises.Parallel mode is made possible by connectingmore device through of pin11. High output powercan be delivered to very low impedance loads, sooptimizing the thermal dissipation of the system.

December1999

IN- 2R2

680C2

22F

C1 470nFIN+

R1 22K

3

R3 22K

-

+

MUTE

STBY

4

VMUTE

VSTBY

10

9

SGND

MUTE

STBY

R4 22K

THERMALSHUTDOWN

S/CPROTECTION

R5 10K

C3 10F C4 10F

1

STBY-GND

C522F

7 13

14

6

158

-Vs -PWVs

BOOTSTRAP

OUT

+PWVs+Vs

C9 100nF C8 1000F

-VsD97AU805A

+VsC7 100nF C6 1000F

BUFFER DRIVER

11

BOOTLOADER12

5VCLIP

CLIP DET

(*)

(*) see Application note(**) for SLAVE function

(**)

Figure 1: Typical Application and Test Circuit

Multiwatt15ORDERING NUMBER: TDA7293V

MULTIPOWER BCD TECHNOLOGY

1/13

Parallel with 7293:

IN- 2R2

680

C222F

C1 470nFIN+

R1 22K

3

R3 22K

-

+

MUTE

STBY

4

10

9

SGND

MUTE

STBY

R4 22K

THERMALSHUTDOWN

S/CPROTECTION

R5 10K

C3 10F

C4 10F

1

STBY-GND

C547F

7 13

14

6

158

-Vs -PWVs

BOOTSTRAP

OUT

+PWVs+Vs

C9 100nF C8 1000F

-Vs

D97AU808C

+VsC7 100nF C6 1000F

BUFFERDRIVER

11

BOOTLOADER12

IN- 2

IN+ 3

-

+

MUTE

STBY

4

10

9

SGND

MUTE

THERMALSHUTDOWN

S/CPROTECTION

1

STBY-GND

7 13

14

6

158

-Vs -PWVs

BOOTSTRAP

OUT

+PWVs+Vs

C9 100nF C8 1000F

-Vs

+VsC7 100nF C6 1000F

BUFFERDRIVER

11

BOOTLOADER12

5CLIP DET

5

MASTER

SLAVE

C10100nF

R72

VMUTE

VSTBY

STBY

Figure 7: Modular Application Circuit

Figure 6b: PCB - Solder Side of the fig. 6.

TDA7293

10/13

IN- 2R2

680C2

22F

C1 470nFIN+

R1 22K

3

R3 22K

-

+

MUTE

STBY

4

10

9

SGND

MUTE

STBY

R4 22K

THERMALSHUTDOWN

S/CPROTECTION

R5 10K

C3 10F

C4 10F

1

STBY-GND

C547F

7 13

14

6

158

-Vs -PWVs

BOOTSTRAP

OUT

+PWVs+Vs

C9 100nF C8 1000F

-Vs

D97AU808D

+VsC7 100nF C6 1000F

BUFFERDRIVER

11

BOOTLOADER12

IN- 2

IN+ 3

-

+

MUTE

STBY

4

10

9

SGND

MUTE

THERMALSHUTDOWN

S/CPROTECTION

1

STBY-GND

7 13

14

6

158

-Vs -PWVs

BOOTSTRAP

OUT

+PWVs+Vs

C9 100nF C8 1000F

-Vs

+VsC7 100nF C6 1000F

BUFFERDRIVER

11

BOOTLOADER12

5CLIP DET

5

MASTER

SLAVE

C10100nF

R72

VMUTE

VSTBY

STBY

Figure 7: Modular Application Circuit

Figure 6b: PCB - Solder Side of the fig. 6.

TDA7293

10/15

Bridge with 7293 and 7294:

BRIDGE APPLICATIONAnother application suggestion is the BRIDGEconfiguration, where two TDA7294 are used, asshown by the schematic diagram of figure 25.In this application, the value of the load must notbe lower than 8 Ohm for dissipation and currentcapability reasons.A suitable field of application includes HI-FI/TVsubwoofers realizations.The main advantages offered by this solution are:

- High power performances with limited supply voltage level.- Considerably high output power even with high load values (i.e. 16 Ohm).The characteristics shown by figures 27 and 28,measured with loads respectively 8 Ohm and 16Ohm.With Rl= 8 Ohm, Vs = 25V the maximum outputpower obtainable is 150 W, while with Rl=16Ohm, Vs = 35V the maximum Pout is 170 W.

22K0.56F

2200F0.22F

TDA7294

+

-

22F

22K

680

22K

3

1

4

137

+Vs

Vi

815

2

14

6

10 9

+

-

3

0.56F 22K1

4

2

14

622F

22K

680

10 9

22F

15 8

-Vs2200F 0.22F

22F

20K

10K 30K

1N4148

ST-BY/MUTE

TDA7294

137

D93AU015A

Figure 25: Bridge Application Circuit

TDA7294

13/17

For 7293:

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value UnitVS Supply Voltage (No Signal) 60 VV1 VSTAND-BY GND Voltage Referred to -VS (pin 8) 90 VV2 Input Voltage (inverting) Referred to -VS 90 V

V2 - V3 Maximum Differential Inputs 30 VV3 Input Voltage (non inverting) Referred to -VS 90 VV4 Signal GND Voltage Referred to -VS 90 VV5 Clip Detector Voltage Referred to -VS 120 VV6 Bootstrap Voltage Referred to -VS 120 VV9 Stand-by Voltage Referred to -VS 120 VV10 Mute Voltage Referred to -VS 120 VV11 Buffer Voltage Referred to -VS 120 VV12 Bootstrap Loader Voltage Referred to -VS 100 VIO Output Peak Current 10 A

Ptot Power Dissipation Tcase = 70C 50 WTop Operating Ambient Temperature Range 0 to 70 C

Tstg, Tj Storage and Junction Temperature 150 C

1

2

3

4

5

6

7

9

10

11

8

BUFFER DRIVER

MUTE

STAND-BY

-VS (SIGNAL)

+VS (SIGNAL)

BOOTSTRAP

CLIP AND SHORT CIRCUIT DETECTOR

SIGNAL GROUND

NON INVERTING INPUT

INVERTING INPUT

STAND-BY GND

TAB CONNECTED TO PIN 8

13

14

15

12

-VS (POWER)

OUT

+VS (POWER)

BOOTSTRAP LOADER

D97AU806

PIN CONNECTION (Top view)

QUICK REFERENCE DATA

Symbol Parameter Test Conditions Min. Typ. Max. UnitVS Supply Voltage Operating 12 50 V

GLOOP Closed Loop Gain 26 40 dB

PtotOutput Power VS = 45V; RL = 8; THD = 10% 140 W

VS = 30V; RL = 4; THD = 10% 110 WSVR Supply Voltage Rejection 75 dB

THERMAL DATA

Symbol Description Typ Max UnitRth j-case Thermal Resistance Junction-case 1 1.5 C/W

TDA7293

2/13

For 7294:

BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value UnitVS Supply Voltage (No Signal) 50 VIO Output Peak Current 10 A

Ptot Power Dissipation Tcase = 70C 50 WTop Operating Ambient Temperature Range 0 to 70 C

Tstg, Tj Storage and Junction Temperature 150 C

TAB connected to -VS

PIN CONNECTION (Top view)

TDA7294

2/17



Schematics and Bill of materials for TDA amplifierSimplified schematic of bridged and paralleled modes

Paralleled mode

Bridged+paralleled mode

Bridged mode



1 1

2 2

3 3

4 4

5 5

6 6

DD

CC

BB

AA

Title

Num

berRevision

Size

A4

Date:

12/12/2011Sheet of

File:D:\!W

orks\..\Amp-P

rotection.SchD

ocDraw

n By:

11

UPC1237

22

33

44

55

66

77

88

U1

330uC1

GND

9.2k

R9

1N4148

D3

4.7uC4

GND

56kR7

6.8kR8

GND

10 R222nC3

GND

1N4148

D2

351

462

78

Rel1

1

2

2 input connectorConn1

GND

22k

R1

1

2

2 input connectorConn2

GND

1N4148D1

GND

1 2 3 4 5 6 7 8 9 10

15x1 pin connector

11 12 13 14 15

Conn31 2 3 4 5 6 7 8 9 10

15x1 pin connector

11 12 13 14 15

Conn4

33uC2

GND

GND

GND

3 input connector

1

2

3Conn5

GND

Dual Speker protection m

odule

http://diyguitarpa.blogspot.com/

http://custompcb.blogspot.com

/

AC 24V

+24V

In2

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\TDA7293-BR-MOD.SchDocDrawn By:

TDA7293

STB-GND1

- IN2

+ IN3Slave GND 4

Clip Det. 5

Bootstrap 6

+V Sig

7-V Sig

8

STBY 9

Mute 10


+V Pow

er13

Out 14

-V Pow

er15

U1

1000u 60VC2

1000u 60VC8

GND

GND

220nC1

220n

C9

22uC6

22kR7

680R1

GND

22kR6

GND

GND GND

10u

C5

GND

+ V

- V

22u

C7

GND

GND

22uC3

TDA 7293/7294 Stage 2 (bridge module)


Out -

123456789

10

15x1

pin

conn

ector

1112131415

Conn4

123456789

10

15x1

pin

conn

ector

1112131415

Conn5

B.S.B.L.

B.L. B.S.

56k

R2

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\TDA7293-PAR-MOD.SchDocDrawn By:

TDA7293

STB-GND1

- IN2

+ IN3Slave GND 4

Clip Det. 5

Bootstrap 6

+V Sig

7-V Sig

8

STBY 9

Mute 10


+V Pow

er13

Out 14

-V Pow

er15

U1

1000u 60VC2

1000u 60VC8

GND

GND

220nC1

220n

C9

GND

+ V

- V

GND

GND

22u

C7

TDA 7293/7294 Stage 3 (paralel module)


123456789

10

15x1

pin

conn

ector

1112131415

Conn1

123456789

10

15x1

pin

conn

ector

1112131415

Conn2

B.S.B.L.

Out +/-

B.L.

B.S.

56k

R6

B.S.B.L.

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\TDA7293.SchDoc Drawn By:

TDA7293

STB-GND1

- IN2

+ IN3Slave GND 4

Clip Det. 5

Bootstrap 6

+V Sig

7-V Sig

8

STBY 9

Mute 10


+V Pow

er13

Out 14

-V Pow

er15

U1

1000u 60VC2

1000u 60VC8

GND

GND

220nC1

220n

C9

22uC6

22kR7

680R1

GND

22kR6

GND

GND GND

10uC5

3 inp

ut co

nnec

tor

1

2

3

Conn1

GND

GND

10uC3

10uC4

GND GND

10kR3

22kR4

GND

+ V

- V

3 inp

ut co

nnec

tor

1

2

3

Conn6

GND

Out -

Out +

In 1

Buff. Drv.

22u

C7

30kR2

1N4148

D1

22kR5

220 R10BC212

T1 82k R9

6.8k

R8

1

2

2 inp

ut co

nnec

tor

Conn7

GND

3 inp

ut co

nnec

tor

1

2

3

Conn5

22uC10

TDA 7293/7294 Stage 1 (main module)


123456789

10

15x1

pin

conn

ector

1112131415

Conn4

123456789

10

15x1

pin

conn

ector

1112131415

Conn2

GND

Out -

Br. I/OSTBYMute- V+ V

B.S.B.L.

B.L. B.S.

MuteSTBY

In 2

56kR11

Schematics and Bill of materials for TDA amplifierConnections between single, bridge and parallel modes

Notes

Blue lines: connections between main module and bridge module, one con-nection required between parallel mod-ule and bridged module .Green lines: connection between main module and parallel module, and be-tween bridge module and parallel mod-ule .Yellow lines: Connection between all modules and speaker protection .Red lines: Input for all channels, the dot-ted line is for second channel if the full configuration is stereo .

Input connectors for another modules: Conn4 on Main module Conn5 on Bridge module Conn2 on parallel module



Schematics and Bill of materials for TDA amplifierVariations between main, bridge, and parallel modules

Bridge application:

1) - 1 TDA729x IC paralleled / bridge


Single application:

1) - 1 TDA729x IC paralleled


One channel (mono) applications:

About 75-80W:1. Main module only2. Main module and speaker protection

About 150-200W on 8 Ohm:1. Main module and Bridge module2. Main module, Bridge module and speaker

protection

About 120W on 4 Ohm:1. Main module, parallel module2. Main module, parallel module and speaker

protection

About 180W on 4 Ohm:1. Main module, and 2 parallel module2. Main module, 2 parallel module, and

speaker protection

About 220W on 8 Ohm:1. Main module, 1 parallel module, bridge

module and 1 parallel module2. Main module, 1 parallel module, bridge

module, 1 parallel module and speaker protection

About 300W on 4 Ohm:1. Main module, 2 parallel module, bridge

module and 2 parallel module2. Main module, 2 parallel module, bridge

module, 2 parallel module and speaker protection

Two channel (stereo) applications:

About 2x75-80W:1. Main module, speaker protection, main

module

About 2x150-200W on 8 Ohm:1. Main module and Bridge module, speaker

protection, main module, bridge module

About 2x120W on 4 Ohm:1. Main module, parallel module, speaker

protection, main module, parallel module

About 2x180W on 4 Ohm:1. Main module, and 2 parallel module,

speaker protection, main module, 2 parallel module

About 2x220W on 8 Ohm:1. Main module, 1 parallel module, bridge

module and 1 parallel module, speker protection, main module, 1 parallel module, bridge module and 1 parallel module

About 2x300W on 4 Ohm:1. Main module, 2 parallel module, bridge

module and 2 parallel module, speaker protection, main module, 2 parallel module, bridge module and 2 parallel module

PCB for modular expandable

TDA amplifier project



PCB for TDA729x amplifier projectPCB of main module

PCB for TDA729x amplifier projectPCB of bridge module

1 3

C2

C5

C4R1

U1

C8

R8

C1

T1

D1R2

C9

R4

R10

R11

Conn1

Conn5

C3

C10

C6Conn2

Conn7

R9

R3

R5

R6

R7

Conn6 C9

C6

R6R7

C8

U1

C2

C3

R1

C1C5

R2

Conn4 Conn5

TOP LAYER TOP LAYERBOTTOM LAYER BOTTOM LAYER

OVERLAY ON TOP LAYER

OV

ER

LAY

ON

TO

P LA

YE

R

Notes

This module can be used alone for mono - or with speaker protection - for ste-reo amplifiers . This is the first module for all possible configurations . Conn4 can be connected to the right side of speaker protection only, Conn2 is the input of bridge, parallel or speaker protection modules . Notes

This is the bridge mod-ule of this project . This module can be con-nected to the right side of first (main) module only . This module du-plicate the output pow-er with 8 ohm speak-ers . 4 Ohm speakers cannot be used with bridge amplifier if par-allel modules not used .



PCB for TDA729x amplifier projectPCB of parallel module

PCB for TDA729x amplifier projectPCB of speaker protection module

R6

C8

C2

C9

U1

C1

Conn2Conn1

R1

R8

R7

C2

U1 R2R9

C1

C4

Conn5

D1

C3

Conn1Conn2

D2Rel1

D3

Conn4

TOP LAYER TOP LAYERBOTTOM LAYER BOTTOM LAYER

OV

ER

LAY

ON

TO

P LA

YE

R

OV

ER

LAY

ON

TO

P LA

YE

R

Notes

This is very simple, cheap and optional module for all configuration of this amplifier project with UPC1237 . This module possible to use for all one channel mono and all two channels stereo configura-tions . This module (if used) must be connected between the last module of left channel and the first (main) module of right channel . Otherworld, the left side connector (Conn3) of speaker protection must be connected to the last module (main, bridge or parallel) of left channel, and the right side con-nector (Conn4) must be connected to the (first) main module of right channel .

Notes

This is the parallel mod-ule of this amplifier pro-ject . This mode can be connected to the right side of first (main) mod-ule to use with 4 ohm speakers, or can be connected to the sec-ond (bridge) module to use bridged amp with 4 ohm speakers instead of 8 . For parallel amplifica-tion use only TDA7293 only . This module can be duplicated on sin-gle or bridged con-figurations after main or bridged module to increase the maxi-mum output current . Its mean, this module can be connected to the previous parallel mod-ule as second parallel output .



3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

C9

C7

C6

R6R7

C2

U1

R2

C8

C3

R1

C1C5

Conn4 Conn5

C9

C7

C6

R6R7

C2

U1

R2

C8

C3

R1

C1C5

Conn4 Conn5

Examples how to connect modules and build instrument

amplifiers

Examples for modular amplifiersMono bridge, single and parallel, stereo bridge and single amp

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

C9

C7

C6

R6R7

C2

U1

R2

C8

C3

R1

C1C5

Conn4 Conn5

R1

R8

R7

C2

U1 R2R9

C1

C4

Conn5

D1

C3

Conn1Conn2

D2Rel1

D3

Conn4

R1

R8

R7

C2

U1 R2R9

C1

C4

Conn5

D1

C3

Conn1Conn2

D2Rel1

D3

Conn4

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

Mono bridge

Mono single Stereo single

Stereo bridge

Mono parallel

Main module

Main module

Main module

Main module Main module

Speaker protection

Speaker protection

Main module

Main module

Bridge module

Bridge module

Bridge module

Parallel module



3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

3 1

C2

R1

R6

U1

R2

C8

C1

R4D1C7

T1

R9R8 R10 R11

Conn6 Conn5 Conn1

C6C3

C9C4

R5C10

R7 R3C5

Conn7

Conn2

C9

C7

C6

R6R7

C2

U1

R2

C8

C3

R1

C1C5

Conn4 Conn5

C9

C7

C6

R6R7

C2

U1

R2

C8

C3

R1

C1C5

Conn4 Conn5

C9

C7

C6

R6R7

C2

U1

R2

C8

C3

R1

C1C5

Conn4 Conn5

R1

R8

R7

C2

U1 R2R9

C1

C4

Conn5

D1

C3

Conn1Conn2

D2Rel1

D3

Conn4

R1

R8

R7

C2

U1 R2R9

C1

C4

Conn5

D1

C3

Conn1Conn2

D2Rel1

D3

Conn4

Stereo bridge + parallel

Mono bridge + doubled parallel amplifier with speaker protection

Main module

Main module

Main module

Speaker protection

Speaker protection

Bridge module

Bridge module

Bridge module

Examples for modular amplifiersStereo bridge + parallel, mono bridge + doubled parallel amp with

speaker protection

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

C7

C8

R6

C1

C2

U1

C9

Conn2Conn1

Parallel module

Parallel module

Parallel module

Parallel module

Parallel module

Parallel module

Parallel module

Parallel module



More power with parallel

modules up to 800W

More power with parallel modulesMore power with 3 parallel modules

Notes

As previous application examples, I offered two parallel module after all main and bridge module on the whole system . With this system by the official datasheet the possible output power is 300W .

For one 300W system these modules required: 1 Main module 2 Parallel module 1 Bridge module 2 Parallel module Speaker protection with FAN controllerThis system contains 6 TDA7293 chips, for stereo application required 12 chips .

But try to increase the maximum number of parallel modules more than 2 . If modify the num-ber of 2 parallel modules to 3, the possible output power is around 800W: 1 Main module 3 Parallel module 1 Bridge module 3 Parallel module Speaker protection with FAN controllerThis system contains 8 TDA7293 chips, for stereo application required 16 chips + speaker protection . The 800W output power maybe true if one chip really gives 100W . But this sys-tem required more powerful power supply, and better heating system with fan controller .

Bridge application:



Single application:





More power with parallel modulesSpeaker protection schematic with PWM fan controller V:1

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSize

A4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\Amp-Protection+PWM.SchDocDrawn By:

11

UPC1237

22

33

44

55

66

77

88

U2

330uC8

GND

9.2k

R10

1N4148

D7

4.7uC12

GND

56k R8

6.8kR9

GND

10R6

22nC11

GND

1N4148

D5

35

1

46

2

7 8

Rel1

GND

22kR3 1 2

2 inp

ut con

nector

Conn3

GND

1N4148D3

GND

123456789

10

15x1

pin con

nector

1112131415

Conn4

123456789

10

15x1

pin con

nector

1112131415

Conn5

33uC10

GND

GND

GND


Conn1

GND

AC 24V+24V

In2

IN3

1

OUT 2

ADJ

LM317VR1

100nC3

10uC1

D112V Zener

GND GND

GND

100nC4

10uC2

GND GND

2

31

411

A

LM324

U1A

5

67B

LM324

U1B

10

98C

LM324

U1C

12

1314D

LM324

U1D

100kR1

100kR2

GND GND

100k

R5

47k

R7

100k

R4 10n

C5

10kP1

5.6k

P2

GND

t

NTH4G1

RT1Res Thermal

GND

100nC6

1N40

04 D2

A

-

+

12V Co

oler

B2

A

-

+

12V Co

oler

B1

A

-

+

12V Co

oler

B3

Dual Speker protection module with PWM fan controller


470

R11

2.7kR12

D4LED2 100nC7

100nC9

D6LED2

IRF640F1

Notes

This new schematic made for this modular amplifier project is PWM fan controller needed . If you build amplifier system with parallel modules, better heating needed . This schematic contains simple speaker protection circuit with UPC1237, but FAN controllers included for 3 12V coolers . These coolers have to be assembled to the heatsink or tho the case of the amplifier . This new circuit can be used and connected between the left and right channels, or after the last module of one channel of mono application . The 10kOhm RT1 thermal resistor must be fixed to the heatsink .

Bill of MaterialsAmp-Protection+PWM.SchDoc 1/22/2012 17:29:40

Comment Footprint Value Quantity Pins Designator Price Total PriceH Total H12V Zener Diode 1 2 D1 #VALUE! #VALUE!Adj Voltage Regulator + 221A-04 LM317 1 3 VR1 #VALUE! 65 65 FtCap Elco 12 mm, 2 mil pins 330u 1 2 C8 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 10u 2 2 C1, C2 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 33u 1 2 C10 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 4.7u 1 2 C12 #VALUE! #VALUE!Connector Panel Connector 2 input Small 2 input connector 1 2 Conn3 #VALUE! 20 20 FtConnector Panel Connector 3 input Small 3 input connector 1 3 Conn1 #VALUE! 44 44 FtCooler 12V 2 pin connector 100mil 12V Cooler 3 2 B1, B2, B3 #VALUE! #VALUE!Diode Diode 1N4004 1 2 D2 #VALUE! 2 2 FtDiode Diode 1N4148 3 2 D3, D5, D7 #VALUE! 2 6 FtHeader 15 pin Male connector PHSR-15 (T-T) 15x1 pin connector 2 15 Conn4, Conn5 #VALUE! 10 20 FtLED2 2 pin connector 100mil 2 2 D4, D6 #VALUE! #VALUE!LM324 J014 LM324 1 14 U1 #VALUE! #VALUE!N-CHANNEL MOSFET TO220 IRF640 1 3 F1 #VALUE! #VALUE!NonPolarized Cap CAP, Ceramic, 1MIL 100n 5 2 C3, C4, C6, C7, C9 #VALUE! #VALUE!NonPolarized Cap CAP, Ceramic, 1MIL 10n 1 2 C5 #VALUE! #VALUE!NonPolarized Cap CAP, Ceramic, 1MIL 22n 1 2 C11 #VALUE! #VALUE!Relay 2 Relay RE2L 24V DC 1 8 Rel1 #VALUE! #VALUE!Res Thermal 2 pin connector 100mil NTH4G1 1 2 RT1 #VALUE! #VALUE!Resistor Resistor 300mil 10 1 2 R6 #VALUE! 2 2 FtResistor Resistor 300mil 100k 4 2 R1, R2, R4, R5 #VALUE! 2 8 FtResistor Resistor 300mil 2.7k 1 2 R12 #VALUE! 2 2 FtResistor Resistor 300mil 22k 1 2 R3 #VALUE! 2 2 FtResistor Resistor 300mil 470 1 2 R11 #VALUE! 2 2 FtResistor Resistor 300mil 47k 1 2 R7 #VALUE! 2 2 FtResistor Resistor 300mil 56k 1 2 R8 #VALUE! 2 2 FtResistor Resistor 300mil 6.8k 1 2 R9 #VALUE! 2 2 FtResistor Resistor 300mil 9.2k 1 2 R10 #VALUE! 2 2 FtTrimmer pot POT Trimmer Small 10k 1 3 P1 #VALUE! 40 40 FtTrimmer pot POT Trimmer Small 5.6k 1 3 P2 #VALUE! 40 40 FtUPC1237 UPC1237 1 8 U2 #VALUE! #VALUE!




More power with parallel modulesSpeaker protection PCB with PWM fan controller V:1

More power with parallel modulesSpeaker protection schematic with PWM fan controller V:2

1

D1

R1

2C2 C1

F1

C3

U2

C7B3

R10C11

D7

C6B2

P2

D5

C12

C10

P1

VR1

R7

D3

C8

Conn4

Conn1

U1

R2

C4

D4Conn3

D6

R3D2

R5

Rel1

C5

3R11

R6

R9

RT1C9B1

R12

R8

R4

TOP LAYER BOTTOM LAYER

OVERLAY ON TOP LAYER

1

1

2

2

3

3

4

4

5

5

6

6

D D

C C

B B

A A

Title

Number RevisionSizeA4

Date: 1/22/2012 Sheet ofFile: D:\!Works\..\Amp-Protection+MIC502-PWM.SchDocDrawn By:

11

UPC1237

22334455667788

U2

330uC8

GND

9.2k

R10

1N4148

D7

4.7uC12

GND

56k R8

6.8kR9

GND

10R6

22nC11

GND

1N4148

D5

35

1

46

2

7 8

Rel1

GND

22kR3 1 2

2 inp

ut co

nnec

tor

Conn3

GND

1N4148D3

GND

123456789

10

15x1 pin

conn

ector

1112131415

Conn4

123456789

10

15x1 pin

conn

ector

1112131415

Conn5

33uC10

GND

GND

GND


Conn1

GND

AC 24V+24V

In2

IN3

1

OUT 2

ADJ

LM317VR1

100nC3

10uC1

D112V Zener

GND GND

GND

D6LED2

Dual Speker protection module with PWM fan controller V2


220uC2

GND

47kP1

GND

t

NTH

4G1 RT1

Res Thermal

5kR1

20kR2

GND100nC6

270

R4IRF640F1

100n

C4

1N4004

D2

A- +

12V Cooler

B2

A- +

12V Cooler

B1

A- +

12V Cooler

B3

2.7k

R12D4 LED2

100n

C5

100n

C7

GND

Mic 502

VT11

CF2

VSLP3

GND4 VT2 5OTF 6OUT 7VDD 8

U1

GNDGND GND

1N4004D8

GND

Notes

This is the second version of speaker protec-tion with new PWM fan controller . The main part of new fan controller is the MIC502 fan controller chip . With this solution the PCB of this circuit can be much smaller . The schematic contains speaker protection with UPC1237 . With P1 potentiometer set the sleep mode, the minimum value of the tem-perature when the coolers starts . I offer 3 or more 12V coolers for heatsink and for the case, depending on the power of full ampli-fier system .

Bill of MaterialsAmp-Protection+MIC502-PWM.SchDoc 1/22/2012 17:30:35

Comment Footprint Value Quantity Pins Designator Price Total PriceH Total HLED2 2 pin connector 100mil 2 2 D4, D6 #VALUE! #VALUE!Cooler 12V 2 pin connector 100mil 12V Cooler 3 2 B1, B2, B3 #VALUE! #VALUE!Res Thermal 2 pin connector 100mil NTH4G1 1 2 RT1 #VALUE! #VALUE!Adj Voltage Regulator + 221A-04 LM317 1 3 VR1 #VALUE! 65 65 FtNonPolarized Cap CAP, Ceramic, 1MIL 100n 4 2 C3, C4, C5, C7 #VALUE! #VALUE!NonPolarized Cap CAP, Ceramic, 1MIL 22n 1 2 C11 #VALUE! #VALUE!NonPolarized Cap CAP, WIMA, 2MIL 100n 1 2 C6 #VALUE! #VALUE!12V Zener Diode 1 2 D1 #VALUE! #VALUE!Diode Diode 1N4004 2 2 D2, D8 #VALUE! 2 4 FtDiode Diode 1N4148 3 2 D3, D5, D7 #VALUE! 2 6 FtCap Elco 12 mm, 2 mil pins 220u 1 2 C2 #VALUE! #VALUE!Cap Elco 12 mm, 2 mil pins 330u 1 2 C8 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 10u 1 2 C1 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 33u 1 2 C10 #VALUE! #VALUE!Cap Elco 6mm, 1 mil pins 4.7u 1 2 C12 #VALUE! #VALUE!Header 15 pin Male connector PHSR-15 (T-T) 15x1 pin connector 2 15 Conn4, Conn5 #VALUE! 10 20 FtMIC 502 FAN CONTROLLER P008 Mic 502 1 8 U1 #VALUE! #VALUE!Connector Panel Connector 2 input Small 2 input connector 1 2 Conn3 #VALUE! 20 20 FtConnector Panel Connector 3 input Small 3 input connector 1 3 Conn1 #VALUE! 44 44 FtTrimmer pot POT Trimmer Small 47k 1 3 P1 #VALUE! 40 40 FtRelay 2 Relay RE2L 24V DC 1 8 Rel1 #VALUE! #VALUE!Resistor Resistor 300mil 10 1 2 R6 #VALUE! 2 2 FtResistor Resistor 300mil 2.7k 1 2 R12 #VALUE! 2 2 FtResistor Resistor 300mil 20k 1 2 R2 #VALUE! 2 2 FtResistor Resistor 300mil 22k 1 2 R3 #VALUE! 2 2 FtResistor Resistor 300mil 270 1 2 R4 #VALUE! 2 2 FtResistor Resistor 300mil 56k 1 2 R8 #VALUE! 2 2 FtResistor Resistor 300mil 5k 1 2 R1 #VALUE! 2 2 FtResistor Resistor 300mil 6.8k 1 2 R9 #VALUE! 2 2 FtResistor Resistor 300mil 9.2k 1 2 R10 #VALUE! 2 2 FtN-CHANNEL MOSFET TO220 IRF640 1 3 F1 #VALUE! #VALUE!UPC1237 UPC1237 1 8 U2 #VALUE! #VALUE!




English blog and PCB order: http://custompcb.blogspot.com/Hungarian blog and PCB order: http://diyguitarpa.blogspot.com/

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More power with parallel modulesSpeaker protection PCB with PWM fan controller V:2

1

C1

P1

32 D1

D2

U2F1R4

R10D7

R9R8R6

C7B3

D3

D5

C5B1

C12

D4

R2 C8

C10Conn4

Conn3Conn1D6

R3C3

R1

C6

U1 C11

RT1C4B2

R12

VR1

C2

Rel1

TOP LAYER BOTTOM LAYER

OV

ER

LAY

ON

TO

P LA

YE

R

Schematics and BOM for modular TDA7293 amplifierSchematic and BOM of first (main) moduleSchematic and BOM of second (bridge) moduleSchematic and BOM of third (parallel) moduleSchematic and BOM of speaker protection moduleThree modes of TDA7293 from the official datasheetSimplified schematic of bridged and paralleled modesConnections between single, bridge and parallel modesVariations between main, bridge, and parallel modules

PCB for modular expandable TDA amplifier projectPCB of main modulePCB of bridge modulePCB of parallel modulePCB of speaker protection module

Examples how to connect modules and build instrument amplifiersMono bridge, single and parallel, stereo bridge and single ampStereo bridge + parallel, mono bridge + doubled parallel amp with speaker protection

More power with parallel modules up to 800WMore power with 3 parallel modulesSpeaker protection schematic with PWM fan controller V:1Speaker protection PCB with PWM fan controller V:1Speaker protection schematic with PWM fan controller V:2Speaker protection PCB with PWM fan controller V:2

Tda Modular Amp

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