Hi Nick, I found this simple 386 Guitar Amp Project in the Instructables Site. It looks simple and it would give you a start on your project with minimal parts. Here is the link.
Hi Nick, I found this simple 386 Guitar Amp Project in the Instructables Site. It looks simple and it would give you a start on your project with minimal parts. Here is the link.
That's a good link John. I like the second (bridge) circuit best where he uses the FET follower as a high impedance buffer - certainly easier to solder than my TL071 suggestion. The only worry I would have is that the 100uF cap across the supply may not be big enough if a not very good battery/adapter is used as the power source. (Because the high currents through the speaker will modulate the 9V supply and this may upset the input buffer amp. At high frequencies the 100uF will be OK but at bass guitar frequencies (30Hz open B string) the 100uF cap has an impedance of 53R so it's not very low compared with the suggested speaker load of 4 R. 4700uF would feel better to me.
Thanks Michael, You are right as usual. I too have had problems in the past where the draw on my battery would modulate the power to the other sections of my circuit and cause problems. In addition to having a decent size cap on my power supply I have also gotten in the habit of putting a .1 cap Vcc to Vss on any IC I am working with for stability. Nick should be able to put something together from what we have given him.
