Recent content by sciguy14

I've tried the CMOS 555 circuit you posted above, still without luck. The speaker tone is just very "buzzy" instead of the nice solid sound when I use the micro's timer. I even removed the volume control to ensure that wasn't the issue. I'm totally at a loss here. Could I try using some...

Thanks for the tips. I don't really care what kind of wave it is, so long as it sounds decent on a simple 8ohm or 4ohm speaker. I'd be nice if I could get this going with parts I already have, which include schmitt triggers, op amps, audio amps, transistors, and a digital pots (plus resistors...

Thanks for the help so far! I'm going to stick to a squarewave if it's easier. It doesn't need to sound concert quality :smile: I happened to have an LM386 laying around, so I set up the circuit in the attached schematic. When I use the schmitt trigger squarewave generator (as in the...

I'm not driving the speaker directly. The square wave goes through a variable resistor (to control volume) which then goes to the base of a darlington transistor. 5V flows through the darlington, through a 50ohm resistor, then through the speaker to ground. I'll pickup a CMOS 555 from...

Hey all! I'm trying to drive 5 speakers, each at a different preset frequency. I had been using the timer in my microcontroller to drive one, but it would get very messy to drive 5 simultaneously in software using just the 1 available timer. I've decided to drive each with a...