EzPCB-Nila
Member level 3
This is a small yet high performance headphone amplifier board. The design is follow JLH-2005 class A amplifier. In this design, BD140 was replaced with BC560 and BD139 replaced with BC550. MJE3055 is used as driver transistor. A small heatsink is enough because 200mA Iq is enough for biasing headphone amplifier. The overall THD is only 0.008% (600Ohm, 1KHz, 0.5Vp-p). When listening with HD600, the high freq is clear, bass is full of engerge. Overall performance is excellent!
Please see the details in the link:
**broken link removed**
![dscn8979.jpg dscn8979.jpg](https://www.edaboard.com/data/attachments/52/52817-bb862aa5d27b636ed69c8ec027851c78.jpg)
![dscn8980.jpg dscn8980.jpg](https://www.edaboard.com/data/attachments/52/52818-5b4b15867a34ebc47b4033cfbdc253db.jpg)
Please see the details in the link:
**broken link removed**
![dscn8979.jpg dscn8979.jpg](https://www.edaboard.com/data/attachments/52/52817-bb862aa5d27b636ed69c8ec027851c78.jpg)
![dscn8980.jpg dscn8980.jpg](https://www.edaboard.com/data/attachments/52/52818-5b4b15867a34ebc47b4033cfbdc253db.jpg)