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Basic Amp 10kΩ 5% R3 C3 10kΩ 5% 1uF 6 4 2 LM358AN 2 U1A Sets ref level at Vcc/2 9V © Bob York R7 100kΩ 5% IN- C6 10uF IN+ 4 1 5 8 C7 R8 10kΩ Key=A Volume Control 50% D1 1N4148 D2 1N4148 R9 10kΩ 5% 33nF (see Data IC=0VSheet) 5% Limiting Diodes C9 470uF U2 LM386N-3 VOUT 1uF VCC R6 100kΩ 5% C4 10uF 3 R5 10kΩ 8 9V C5 1 3 VCC 7 BYPASS 1uF 100uF 10kΩ 5% VS 1 C2 R4 GAIN8 1uF Aux Input C10 10kΩ 5% R2 GND 3 2 9V VCC R1 GAIN Stereo Input Jack C1 R10 10Ω 5% Speaker C8 100nF IC=0V 5% Amp with Tone Control Stereo Input Jack C1 R1 R2 10kΩ R12 10kΩ C3 10kΩ 1uF LM358AN 2 U1A R5 10kΩ 8 Sets ref level at Vcc/2 9V C11 1 3 VCC R11 20kΩ Key=A 50% 4 R3 10kΩ R13 22nF R14 2.2kΩ R15 9V VCC 4 VCC LM358AN 2 U1B C10 1 100uF 3 Vref C4 22nF 10kΩ 9V R6 100kΩ 2.2kΩ C12 6 C5 R7 100kΩ 2 10uF 1uF 7 IN- Volume Control D1 1N4148 D2 1N4148 10uF IN+ 4 1 5 8 C7 50% Limiting Diodes © Bob York C9 470uF U2 LM386N-3 VOUT GND 3 R8 10kΩ Key=A C6 8 BYPASS 1uF Aux Input R4 GAIN8 1 C2 10kΩ GAIN 1uF 2 VS 3 (see Data Sheet) 33nF R9 10kΩ R10 10Ω Speaker C8 100nF Speaker Measurements Rc Lc R + Vg VL - |Z| © Bob York Lm Cm Rm LM386 and LM358 © Bob York LM386 Amp © Bob York Summing Network Stereo Input Jack C1 R1 3 1uF-POL 2 1 C2 R4 R2 10k 10k 1uF-POL C3 Aux Input 10k 4 R3 LM358AN 2 10k 1uF-POL U1A 1 3 R5 10k 8 VCC VCC Sets ref level at Vcc/2 9V 9V R6 100k C4 10uF-POL © Bob York R7 100k Test Circuit Power Supply Function Generator Speaker +9 V Amplifier Circuit © Bob York Voltage Gain, dB Tone Control Circuit 20 15 10 5 0 -5 -10 -15 -20 10 © Bob York 100 1,000 10,000 100,000 Frequency, Hz 3.5mm Stereo Jack and Plug © Bob York Microphone Circuit © Bob York Microphones +V +V R R sound © Bob York out sound out LF353 © Bob York MIC and Gain Stage © Bob York Test Circuit Bench Power Supply Speaker +/-12 V © Bob York Microphone Circuit (on breadboard) Batteryoperated Amplifier Circuit Microphone Improvements © Bob York Speech Filter R7 & R1 Can be adjusted to shape the passband response R8 47k R4 47k R7 33k B +12V +12V C1 0.068uF In C4 .068uF + R5 10k -12V R6 10k C1 & C4 (or R5 and R6) determine lower cutoff © Bob York 1/2 LF353 R1 33k R2 10k R3 10k + C2 .0047uF 1/2 LF353 A Out -12V C3 0.0047uF C2 & C3 (or R2 and R3) determine upper cutoff LM384 © Bob York
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