This is a high quality headphone amplifier circuit which built using 3 NPN transistors. This circuit is very simple and reliable, hard to break, offers a lot of power, excellent sound quality, it is built with just a few simple parts and more importantly it has a very little power supply consumption. With just two AA batteries it can work for a very long time.
Parts List:
- R1 - 100K
- R2 - 330
- R3 - 100
- R4 - 22 (2 - 4.5V)
- R4 - 100 (5 - 12V)
- C1 - 4.7uF
- C2 - 4.7uF
- C3 - 100 - 1000uF
- C4 - 220uF
- P1 - 100K
- D1, D2 - 1N4148
- Q1, Q2 - BC549
- Q3 - BC559
High Quality Headphone Amplifier Circuit Source: electronics-diy.com
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