便携式耳机放大电路:
R1 = 10K 1/4W Resistor
R2 = 100K 1/4W Resistor
R3 = 68K 1/4W Resistor (see notes)
R4 = 1K5 1/4W Resistor
R5 = 3K3 1/4W Resistor
R6 = 330R 1/4W Resistor
R7 = 4K7 1/4W Resistor
R8 = 2R2 1/4W Resistor

C1 = 1?F 63V Polyester Capacitor
C2 = 100?F 25V Electrolytic Capacitor
C3 = 470?F 25V Electrolytic Capacitor

Q1 = BC239C 25V 100mA NPN High-gain Low-noise Transistor
Q2 = BC337 45V 800mA NPN Transistor
Q3 = BC327 45V 800mA PNP Transistor

J1 = Stereo 3mm. Jack socket

SW1 = SPST Switch
B1 = 3V Battery (two 1.5V AA or C cells in series)