You probably know that LM317 IC
is used as an adjustable voltage regulator, but did you know it can be used as
an audio amplifier? This is a class A audio amplifier built with LM317 that
delivers a maximum 1W audio power.
Use a good heatsink for the
LM317 IC and adjust the 5K variable resistor so that you have 4.5V on 10Ω
resistor (or LM317 pin 2, Vout).
LM317
amplifier schematic
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