While it is possible to build good audio amplifiers from discrete transistors, they are no match for the many audio amp IC's available to us. In a previous article I discussed building audio amplifiers using discrete transistors. The increased gain is only used when a very low input signal is to be amplified. It is important to understand that increasing the gain does not increase the output power. By removing R2 and connecting C2 across pins 1 and 8, we can increase the gain to 200. This configuration will give us a gain of 20. The LM386 IC is unique in that the gain can be modified by changing Resistor R2 and Capacitor C2. The circuit is very simple and construction is easy on a breadboard. This project shows how to build an Audio amplifier based on LM386 IC.
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