The circuit diagram of headphone amplifier.
| Parts list(Stereo) | Qty | Notes | |
| 2N3904 | NPN transistor | x8 | or BC547 |
| 2N3906 | PNP transistor | x2 | or BC557 |
| BC337 | NPN transistor | x2 | |
| BC327 | PNP transistor | x2 | |
| 1N4148 | Diode | x4 | |
| 1S3 | SBD | x2 | |
| 47p | Film capacitor | x2 | WIMA FKP2 |
| 0.047u | Film capacitor | x2 | |
| 2.2u | Film capacitor | x4 | Panasonic ECQV |
| 0.27u | Film capacitor | x4 | 0.1u - 0.27u |
| 10u | Tantalum capacitor | x2 | 3.3u - 10u |
| LED | Red LED | x2 | |
| 10 ohm | Metal film resistors | x10 | |
| 510 ohm | Metal film resistors | x6 | |
| 1.6k | Metal film resistors | x2 | |
| 4.7k | Metal film resistors | x2 | |
| 12k | Metal film resistors | x2 | |
| 36k | Metal film resistors | x4 | |
| 100 ohm | Trimm resistor | x2 | B Curve |
| 10k | VR | x1 | A Curve |
The power supply.
Parts layout.
Red Line is jamper.
Purple Line is wire(AWG22).
Very clear and dynamic sound!
At your own risk! Good luck!
Thank you, I copied your circuit and am enjoying really beautiful sound, guessing the reason of the good quality. Probably the outputs are working class-A operation and the constant current is large enough to attain a stable and a quasi-linear operation of active elements. The current was too large for my 4.7k/0.25W above LED(RED) line so I put 0.5W one. The NPNs are, of course, from my 2SC1213A bundle.
返信削除添削ありがとうございます、ありがたく採用させていただきましたｗ
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