50mW micro audio amplifier circuit with 2N3053

50mW Audio Amplifier

Here’s a little audio amplifier similar to what you might find in a small transistor radio. The input stage is that the voltage is equal to two complimentary transistors which are biased slightly distorted in the leadership that the split between the diodes. Used 3.3 ohm resistor in series with the producers of the transistors to stabilize the bias current, so it does not change much with temperature or with different transistors and diodes. Since the bias current increases, the voltage between the emitter and base decreases, a heat pipe. Input impedance is 500 ohms and the voltage gain is about 5 to 8-ohm speakers connected. Voltage on the speaker is about 2 volts without the distortion and power is in the range of 50 mW. Higher voltage and adding a cooler, the more power output transistors. Circuit draws about 30 mA from a 9-volt supply.