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D1____________100V 1A Diode bridge

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Q1,Q3_________BC337   45V 800mA NPN Transistors

IC1___________LM833 or NE5532 Low noise Dual Op-amp

Schematic shows left channel and power supply.

SW1___________SPST Mains switch

R7______________2K2  1/4W Resistor

Can drive old 8 Ohms impedance headphones, but these obsolete devices are not recommended.

P1_____________22K   Log.PotenTIometer (Dual-gang for stereo)

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Output voltage: Well above 5V RMS on all loads

Frequency response: Flat from 30Hz to 20KHz

C1______________1΅F   63V Polyester Capacitor

R1____________560R   1/4W Resistor

T1____________220V Primary, 15 + 15V Secondary 5VA Mains transformer

Numbers in parentheses show IC1 right channel pin connections.

Amplifier parts:

关键词：耳机放大电路耳机放大器

Can be directly connected to CD players, tuners and tape recorders.

Sensitivity: 250mV input for 5V RMS output

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Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohms.

IC2___________7815  15V 1A Positive voltage regulator IC

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C7,C8________2200΅F   25V ElectrolyTIc Capacitors

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耳机放大器电路 (Headphone Amplifier)

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Power supply parts:

PL1___________Male Mains plug

Total harmonic distortion @ 1KHz & 10KHz: Below 0.005% on 32 Ohms load and up to 4V RMS output (typical 0.003%)

A correct grounding is very important to eliminate hum and ground loops. Connect in the same point the ground sides of J1, P1, C2, C3 & C4. Then connect separately the input and output grounds at the power supply ground.

Unconditionally stable on capacitive loads

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J1______________RCA  audio input socket

[导读] 耳机放大器电路 (Headphone Amplifier) Amplifier parts:

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