Good day all,
I have been messing about with my Bitx40 SMD on an off for a couple of weeks working towards getting it mounted in a case.
I have removed C113 across the LM386 pins 1 and 8 to reduce the gain, makes a big difference. Problem is that I get a high pitched "squeal" or oscillation at very LOW volume setting; turning the volume up a bit more and it disappears.
I have spent some time searching the archives for similar posts and fixes but just haven't managed to find much that is relevant.
Ideas? Better bypassing on the power lines to the LM386?
Speaker is smallish 3" diameter generic 8 ohm speaker.
cheers, Graham ve3gtc
