ECE 11 Final Project: Boom Box Design and Implementation
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ECE 11 Final Project: Boom ECE 11 Final Project: Boom Box Design and Implementation Box Design and Implementation By Scott Trocchia ECE 11 Fall 2008 Professor Korman, GTA Yi Jin Presented on 12/16/08
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ECE 11 Final Project: Boom Box Design and Implementation. By Scott Trocchia ECE 11 Fall 2008 Professor Korman, GTA Yi Jin Presented on 12/16/08. Definition: break large project (seemingly complicated and daunting task) into its constituents (piece by piece) - PowerPoint PPT Presentation
Transcript of ECE 11 Final Project: Boom Box Design and Implementation
ECE 11 Final Project: Boom ECE 11 Final Project: Boom Box Design and Box Design and ImplementationImplementation
By Scott TrocchiaECE 11 Fall 2008
Professor Korman, GTA Yi JinPresented on 12/16/08
The Approach: Divide and ConquerThe Approach: Divide and Conquer
Definition: break large project (seemingly complicated and daunting task) into its constituents (piece by piece)
The following slides will explain the circuit through this concept
Stage [1] : Initial Low Pass FilterStage [1] : Initial Low Pass Filter
1st orderInverting designEstablish unity gainSimple illustration
of phasor usageEliminates all noise
above 10 kHz
V 1. 4 25V ac0V dc
R 1
24k
R 2
24k
C 1
680p
+
-
O U T
U 1
O PAMP
0
0
Stage [2a]: Decision to make - Stage [2a]: Decision to make - Treble or Bass? Treble or Bass?
Treble channel 2nd order high pass filter
Reason for order?
Unity gainFrequency
range of interest: 5360 Hz to 10 kHz
+
-
O U T
U 1
O PAMP
C 1
1000p
C 2
1000p
R 1
8 . 2 k
R 256 k
V 1. 4 25V a c0V dc
00
Stage [2b]: Decision to make - Stage [2b]: Decision to make - Treble or Bass? Treble or Bass?
Bass channel 2nd order low pass filter
R C, C RUnity gain, againFrequency range
of interest: 150 Hz to 7360 Hz
+
-
O U T
U 1
O PAMPV 1
. 4 25V a c0V dc
R 1
68k
R 2
160 k
C 1
820p
C 2100p
0
0
Stage [3]: Output StageStage [3]: Output Stage
Same for treble and bass channels
C6 and R8 together represent passive low pass filter
Attenuates all frequency <150 Hz
C7 makes sure AC voltage passes to speaker
0
V 1. 4 25V ac0V dc
R 1
24k
R 2
24k
C 1
680p
+
-
O U T
U 1
O PAMP
0
0
0
0
+
-
O U T
U 2
O PAMP
C 2
1000p
C 3
1000p
R 3
8 . 2 k
R 456k
0
+
-
O U T
U 4
O PAMP
R 5
68k
R 6
160 k
C 4
820p
C 5100p
0
R 25750
R 26750
R 7
1000 k
R 27750
+
-
O U T
U 3
O PAMP C 6. 0 47u
C 7
220u
R 85 . 1
R 28750
R L t re b le8
0
0
R 9
500 k
+
-
O U T
U 5
O PAMP C 8. 0 47u
C 9
220u
R 105 . 1
R Lbas s8
0
0
D 1 D 2 D 3 D 4
D 5
+
-
O U T
U 6
O PAMP
D 6
+
-
O U T
U 7
O PAMP
+
-
O U T
U 8
O PAMP
D 7
+
-
O U T
U 9
O PAMP
+
-
O U T
U 10
O PAMP
D 8 +
-
O U T
U 11
O PAMP
+
-
O U T
U 12
O PAMP
+
-
O U T
U 13
O PAMP
0 0 0
0
0
0
R 11
570 k
R 125 . 7 k
R 135 . 7 k
R 145 . 7 k
R 155 . 7 k
R 16
100 k
R 171 . 1 k
R 181 . 1 k
R 191 . 1 k
R 201 . 1 k
R 21510
R 22510
R 23510
R 24510
0
V 212V dc
0
Treble’s Voltage LadderTreble’s Voltage Ladder
Concept of voltage ladder (+,- polarity)
Initial resistor highest voltage drop
Personal preference and guess and check
LED resistor?
Bass’s Voltage LadderBass’s Voltage Ladder
Concept of voltage ladder (+,- polarity)
Personal preference, again
LED resistor and why we need it
Troubleshooting / Problems / Troubleshooting / Problems / ResolutionsResolutions
TroubleshootingPartsTime issue?Lessons learned and applications
