The headphone amplifier is used to amplify the input signal, making the headphone able to output sound with sufficient volume. This circuit is a headphone amplifier that uses LM833 or NE5532 dual op-amps, with an output power of up to 500mW and excellent sound quality.
The document outlines the components and circuit sections of a stereo earphone amplifier. It includes a parts list, power‑amplifier stage, audio input socket, and power‑supply details.
Key components are the LM833 or NE5532 dual op‑amp, BC337/45V NPN and BC327/45V PNP transistors, an RCA audio input socket, and a 110 V mains transformer with a 9 VA rating. This manual is written in Chinese.
| Op‑amp | LM833 or NE5532 |
|---|---|
| NPN Transistor | BC337/45V, 800 mA |
| Audio Input | RCA socket |
| Power Transformer | 110 V primary, 1 + 1 V secondary, 9 VA |
The amplifier uses either an LM833 or an NE5532 low‑noise dual op‑amp.
The circuit specifies BC337/45V NPN transistors and BC327/45V PNP transistors, each rated for 800 mA.
An RCA audio input socket is used for the signal input.