Mike's right, the LM386 can oscillate when the volume pot is set for minimum volume.
The fix is to insert a resistor, any value between 1k and 10k, between the volume pot pin 2 and the LM386 pin 3.
Also, R111 at 100 ohms limits current into the LM386, this can clip audio peaks.
Can fix this be adding a 10 ohm resistor in parallel.with R111.
I believe both of the above come from posts Raj has made to this forum.
I have no idea where the "2 places on the LM386" are that Mike is putting his 10uF caps.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Mon, Nov 13, 2017 at 07:36 am, Michael Hagen wrote:
Might next work on Audio amp.? Like putting a resistor to the pot for noise at near zero volume.
I went to 16 Ohm 4" (Big) speaker from an 8 Ohm 2" speaker.? That and 10uF caps on the 2 places on LM386
made my audio MUCH better.? My advise is to use a 16 Ohm speaker.
?
