Alex / Basic CMoy Headphone Amplifier

Project Information

The barest of the barebones versions of the CMoy headphone amplifier. No volume control, power switch, or blinkenlights.

Schematic and PCB Layout


The project is intended to be a reference design for the CMoy headphone amplifier designed by Chu Moy. For more information, check out the Wikipedia page:

Bill of Materials

Part Number
Actual Part
Unit Cost
Order Qty
Total Cost
R1, R2 Resistor, 4.75 kohm 1% 1/4 W metal film Vishay CMF504K7500FHEB Axial CMF4.75KQFTR-ND 2 0.77 2 1.54
C1, C2 Capacitor 220 uF electrolytic 35 V Panasonic ECA-1VHG221 Radial P5552-ND 2 0.42 2 0.84
R8, R9 Resistor, 10 kohm 1% 1/4 W metal film Vishay CMF5010K000FHEB Axial CMF10.0KQFTR-ND 2 0.77 2 1.54
U6 TI OPA2132PA Dual Op-Amp, General Purpose Texas Instruments OPA2132PA 8-PDIP OPA2132PA-ND 1 6.58 1 6.58
U1, U2 Battery, 9V alkaline Energizer Battery Corporation EN22 ANSI 1604A, IEC 6LR61 N145-ND 2 2.38 2 4.76
J1, J2 Switchcraft 3.5 mm jack, stereo Switchcraft 35RAPC2BVN4 35RAPC2BVN4-ND 2 3.0 10.0 30.0
R6, R7 Resistor, 1 kohm 1% 1/4 W metal film Vishay CMF501K0000FHEB Axial CMF1.00KQFTR-ND 2 0.77 2 1.54
R4, R5 Resistor, 100 kohm 1% 1/4 W metal film Vishay CMF50100K00FHEB Axial CMF100KQFTR-ND 2 0.77 2 1.54
C3, C4 Capacitor 0.1 uF 5% polyester Panasonic ECQV1H104JL Radial No Digi-key Number 2 ?? 0 0

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