This is a high-fidelity headphone amplifier designed by a German using NE5532. NE5532 is a well-known HI-FI-class pre-amplifier integrated circuit by audio enthusiasts. Its excellent sound performance is highly praised by audiophiles. Although it uses a single power supply, the actual listening effect is still quite good. If you are interested, you may try it.
This manual describes a compact earphone amplifier built around the NE5532 audio op‑amp. It provides the key electrical specifications, recommended power supply and a full parts list for assembly.
The document includes input and output impedance values, voltage range, signal‑to‑noise ratio, and wiring details, helping hobbyists and audio enthusiasts set up the amplifier correctly. This manual is written in Chinese.
| Input Voltage Range | 500 mV‑700 mV |
|---|---|
| Output Impedance | 20‑200 Ω |
| Signal‑to‑Noise Ratio | 90 dB |
| Power Supply | 15 V DC, 200 mA |
It requires a 15 V DC supply capable of delivering up to 200 mA.
The amplifier provides a signal‑to‑noise ratio of 90 dB.
The output impedance ranges from 20 Ω to 200 Ω.