Headphone Amp Parts List
| C1 -
0.2uf or two 0.1uf C2 - 47pf C3, C4 - 4.7uf Electrolytic Capacitor C5 - 100uf Electrolytic Capacitor C6, C7 - 1uf NP Electrolytic Cap. C8, C9 - 47uf Electrolytic Capacitor C10, C11 - 470uf Electrolytic Capacitor C12, C13 - .047uf Ceramic Capacitor C14, C15 - 220uf Electrolytic Capacitor C16 - 47uf Electrolytic Capacitor C17 - 0.1uf Ceramic Capacitor D1, D2 - 1N4733A 5.1 Volt Zener Diode D3, D4 - MBR150G Schottky Diode IC1, IC2 - LM386N-4 IC3 - LM7809 Q1, Q2 - MPF102 R1 - 100K Resistors R2 - 470K R3 - 560* (adjust value as needed) R4 - 680* (adjust value as needed) R5, R6 - 1.5K R7, R8, R9, R10 - 33K R11, R12 - 100K R13, R14 - 10 R15 - 30k Potentiometer (Audio Taper) J1 - 1/4" Switchcraft 12A jack J2, J3 - 3.5mm stereo jacks PSG01537 J4 - DC Power Jack 9 Volt Battery Snap 9 Volt Battery SW1 - SPDT Center Off Switch |
| Note: Start resistors R2 and R3 at 560 ohm and then adjust values as needed to bias the MPF102 FETS properly. All capacitors 25 volts preferred minimum except C16 - 35 volts. |
Instrument input volume control wiring diagram.
