Saturday, August 16, 2014

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Audio Amplifier 250mW

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

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