General description:
This design can be used as a small booster. The amplifier is built around a balance staircase.
The quiescent current is set by diodes D1 and D2. Due to the simplicity of the circuit is a closed-circuit current depending on the temperature of the diodes. When T2 and T3 a much higher temperature than the diodes, which can be annoying. The transistors cooling, then a solution. It is best to stick with some superglue., The two transistors on a small aluminum plate The supply voltage is 9 volts.
Circuit diagram:
Part list:
- R 1 = 4.7 K?
- R 2 = 82 K?
- R3 = 12 K?
- R4 = 1.8 kOhm
- P1 = 10 k
- C1 = 10 V μF/10
- C2 = 100 V μF/10
- C3 = 220 V μF/10
- D1, D2 = 1N4148
- T1 = 547 BC
- T2 = 337 BC
- T3 = 327 BC
