1 Watt Audio Amplifier Circuit using 7905 IC
A simple stereo 1 Watt Audio Amplifier Circuit using 7905 IC is built around two 7905 negative-voltage regulators (IC1 and IC2) and a few discrete components. The 1 Watt Audio Amplifier Circuit will also work with other 79XX regulators if the appropriate power supply is used. Regulator IC 7905 works as an amplifier for the voltages applied to common pin2 (Ground or GND). Also check the LM317 audio amplifier, another interesting circuit.
1 Watt Audio Amplifier Circuit using 7905 IC
The minimal voltage drop over the standard 7905 IC is around 2V and it depends on the output current. Feedback resistors in the IC set the gain of the channel internally. The amplifier is a class-A audio amplifier. The minimal applicable value of R3 for the regulator 7905 is 8.2 to 10 ohms per 5W.
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