![]() Construction of Low Power Audio Amplifier Using LM386 ![]() The pitch of frequency response in the audio system can be increased by replacing C 4 with high value capacitor. Thus, produced output of IC 1 is collected from the pin 5 and then passed towards the loudspeaker via electrolytic capacitor C 4. For maximum gain of 200 (46 dB), a single capacitor needs to be placed in between pins 1 and 8 using the switch SW 1 as portrayed in figure.1. ![]() To extend its versatility and allow the user to obtain any gain value ranging from 20-200, a separate combination of resistor and capacitor is applied externally at pins 1 and 8. So as to keep low count on the external part, gain parameter of IC 1 is initially set to 20. IC 1 intakes inputs from multiple audio sources and audio mixer via pin 3 after passing through potmeter VR 1 used as a volume control. The low power audio amplifier used in this project is fed with an external +12V DC supply through pin 6. However, if required one can replace the low-power amplifier with high-power ones. It is a must to use IC LM386 (IC 1) along with that amplifier. The circuit diagram of low power audio amplifier is shown in figure 1.
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