Friday, 15 January 2016

Make a simple electronic audio amplifier using LM317

Today we are going to learn how to make a simple amplifyer which can amplify any audio signal by using LM317 regulator IC. The amplifier can deliver upto 1W power max and needs only few parts which are easily available. This circuit is originally from vegmatic1966 youtube channel.

Part List:
C1, C3 - 10uF electrolytic capacitor rated 16V

C2 - 470uF electrolytic capacitor rated 16V

R1 - 470 ohms 1/2W

R2 - 10 ohms 2W

POT1 - 5 kilo-ohms potentiometer

SPK - 8 ohms rated 1W speaker

LM317 - 317 or any similar regulator IC

What to do:-

After you assembled the circuit shown above, adjust potentiometer POT1 until the voltage across R2 terminals is half the supply voltage (around 4.5V approximately).

Don't forget adding heatsink or any aluminium sheat for cooling the IC LM317 because it will going to heat up a lot. Check the polarities and pins of the parts before testing.

Part pinouts:

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