Cesium: Cardiac Toxin and Radiological Threat Bob Hoffman New York City Poison Center, NY, USA.
© Bob York Basic Amp. © Bob York Amp with Tone Control.
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© Bob York Basic Amp VCC 9V VCC 9V VCC 9V R6 100kΩ 5% R7 100kΩ 5% R1 10kΩ 5% R2 10kΩ 5% R3 10kΩ 5% R4 10kΩ 5% R5 10kΩ U1A LM 358A N 3 2 4 8 1 Stereo InputJack 1 2 3 Aux Input Sets ref level at Vcc/2 R8 10kΩ Key=A 50% Speaker C7 33nF IC=0V 5% R9 10kΩ 5% C8 100nF IC=0V 5% R10 10Ω 5% D1 1N4148 D2 1N4148 Limiting Diodes Volume Control (see Data Sheet) U2 LM 386N-3 BYPASS 7 GAIN 1 GAIN8 8 GND 4 IN+ 3 IN- 2 VOUT 5 VS 6 C1 1uF C2 1uF C3 1uF C5 1uF C10 100uF C6 10uF C4 10uF C9 470uF
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Transcript of © Bob York Basic Amp. © Bob York Amp with Tone Control.
© Bob York
Basic Amp
VCC
9V
VCC
9V
VCC9V
R6
100kΩ5%
R7100kΩ5%
R1
10kΩ5%R2
10kΩ5%R3
10kΩ5%
R4
10kΩ5%
R510kΩ
U1A
LM358AN
3
2
4
8
1
Stereo Input Jack
1
2
3
Aux Input
Set s r efl evel atVcc/ 2
R810kΩKey=A 50%
SpeakerC7
33nFIC=0V5%
R910kΩ5%
C8100nFIC=0V5%
R1010Ω5%
D11N4148
D21N4148
Li mi t i ngDi odes
Vol umeCont r ol
( see Dat a Sheet )
U2
LM386N-3
BYPA
SS
7
GAIN
1
GAIN
8
8
GND
4
I N+3
I N-2
VOUT5
VS
6
C1
1uF
C2
1uF
C3
1uF
C5
1uF
C10
100uF C6
10uF
C410uF
C9
470uF
© Bob York
Amp with Tone Control
VCC
9V
VCC
9V
VCC9V
R6
100kΩR7100kΩ
R1
10kΩ
R2
10kΩ
R3
10kΩ
R4
10kΩ
R510kΩ
U1A
LM358AN
3
2
4
8
1
U1B
LM358AN
3
2
4
8
1
Stereo Input Jack
1
2
3
Aux Input
Set s r efl evel atVcc/ 2
R1120kΩKey=A50%
R12
10kΩ
R13
2.2kΩ
R14
2.2kΩ
R15
10kΩ
C12
22nF
C11
22nF
Vref
R810kΩKey=A
50%
SpeakerC7
33nF
R910kΩ
C8100nF
R1010Ω
D11N4148
D21N4148
Li mi t i ngDi odes
Vol umeCont r ol
( see Dat a Sheet )
U2
LM386N-3
BYPA
SS
7
GAIN
1
GAIN
8
8
GND
4
I N+3
I N-2
VOUT5
VS
6
C1
1uF
C2
1uF
C3
1uF
C5
1uF
C10
100uF C6
10uF
C410uF
C9
470uF
© Bob York
Speaker Measurements
Vg VL
R
|Z|
+
-
Rc Lc
Lm RmCm
© Bob York
LM386 and LM358
© Bob York
LM386 Amp
© Bob York
Summing Network
VCC
9V
VCC
9V
R6
100k R7100k
R1
10k
R2
10k
R3
10k
R4
10k
R510k
U1A
LM358AN
3
2
4
8
1
Stereo Input Jack
12
3
Aux Input
Set s r efl evel atVcc/ 2
C1
1uF-POL
C2
1uF-POL
C3
1uF-POL
C410uF-POL
© Bob York
Test Circuit
Power Supply
AmplifierCircuit
+9 V
Speaker
FunctionGenerator
© Bob York
Tone Control Circuit
-20-15-10
-505
101520
10 100 1,000 10,000 100,000Frequency, Hz
Vo
lta
ge
Ga
in, d
B
© Bob York
3.5mm Stereo Jack and Plug
© Bob York
Microphone Circuit
© Bob York
Microphones
+V
outR
sound
+V
outR
sound
© Bob York
LF353
© Bob York
MIC and Gain Stage
© Bob York
Test Circuit
MicrophoneCircuit (onbreadboard)
BenchPower Supply
Battery-operatedAmplifierCircuit
+/-12 V
Speaker
© Bob York
Microphone Improvements
© Bob York
Speech Filter
C2 & C3 (or R2 and R3) determine upper cutoff
C1 & C4 (or R5 and R6) determine lower cutoff
R7 & R1 Can be adjusted to shape the passband response
OutIn
C30.0047uF
C2.0047uF
+12V
-12V
A
+1/2LF353+
1/2LF353
B
-12V
+12V
C4.068uF
C10.068uF
R310k
R210k
R133k
R447kR8
47kR733k
R610k
R510k
© Bob York
LM384
