Small active speaker circuit diagram
This circuit is suitable for computer speaker active amplifier or Walkman power connector, with the characteristics of simplicity and reliability, cheap and easy to find components, and easy to make. The circuit schematic is shown below:
The power transformer T1 is a transformer for a recorder with an output of AC 12V/5W. If you don't listen to it often, you can add a power switch in front of the transformer.
Reference voltage: Under normal working conditions, the bias voltages of bias voltage diodes D5 and D6 are +0.69V respectively; the Vbe of the driving amplifier tube Q1 is +0.48V, and the Vce is +5.04V; the Vbe of the upper power amplifier tube Q3 is +0.61V; the Vce is +7.74V; the Vbe of the lower power amplifier tube Q2 is -0.61V; the Vce is -5.72V; the power supply voltage is 13.41V, the midpoint voltage of the audio output terminal is 5.67V, and the power consumption is low.
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