I built a simple LM386 based audio amplifier (schematic attached), but it appears to be over-amplifying, as it makes horrible squeaking noises and picks up a lot of interference. It also gets very hot in use, so I only switch it on for a few seconds at a time. I'm guessing this is because of the high amplification as I have a commercial amplifier that uses an LM386 and it does so without a heatsink, although unfortunately I can't reverse-engineer it and even if I did, my circuit would almost certainly have to be remade. I tried changing the potentiometer today from 1k to 10k and even 100k, but they didn't have much affect. What component(s) should I change to give ti less amplification, I only need about 2-6 times amplification, preferably adjustable but it doesn't matter too much.
Asked by andy70707 7 years ago | last reply 2 years ago