Parts list

Resistors (1/4W, 1% metal film):

R1 – 4.7Kohm
R2, R3 – 2.2Kohm
R4, R5 – 1M
R6, R7 – 1Kohm
R8, R9 – 33Kohm
R10-R13, R15-18 – 10Kohm
R14, R23 – 100Kohm pot, dual-gang, linear taper
R19, R20 – 100Kohm
R21, R22 – 47 ohm

Additional Parts and Materials:

IC1-3 – NE5532 dual audio op-amp
C1 – 33uF, 25WVDC, electrolytic capacitor
C2, C3 – 0.01uF Mylar capacitor
C4, C5 – 10uF, 25 WVDC, electrolytic capacitor
J1-3 – Audio jacks, 1/8-inch, stereo
S1, S2 – Dpdt toggle switch
B1, B2 – Battery, 9 volt
Microphones (Dgik-Key P9967-ND or similar), headphones, PC board, case, wire, hardware, etc