0dB current amplifier circuit designed with K1058/J162
Source: InternetPublisher:黄土马家 Keywords: Current amplifier circuit Updated: 2024/09/13
This circuit cooperates with adjusting two 50kΩ multi-turn trimmer potentiometers to make the output voltage within 30mV, and adjusting the 5kΩ multi-turn trimmer potentiometer to make the voltage across 0.25Ω/5W within 25-50mV.
That is, the quiescent current of the power amplifier is I=U/R=25～50/0.25=100-200mA. To further reduce the distortion, the negative feedback loop of the tube voltage amplifier stage can be moved from point M to point K, and the feedback resistor can be changed from 10kΩ to 47kΩ.
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