Easiest way to convert signal to sound

Well, you can take the signal output and run it to a transistor, sure. Or hell, you have plenty of current in the loop- just put a few turns coil on a speaker and plant the coil strategically around the IGBTs!

Matter of fact, does the circuit "sing" much as-is? I've noticed singing MOSFETs, capacitors or coils (can't tell which, if not all!) when my induction heater starts oscillating in some conditions (gotta sort that out).

Tim

-- Deep Fryer: a very philosophical monk. Website:

I have this assembly that makes square wave that is the output of a comparator chip. It then goes into the gate driver boards, IGBT etc, all of it works.

What I want is to also direct this output into a little speaker, so that can "hear" the circuit running. I have a feeling that I need some "opamp" chip to do that. Anything cheap and easy to use that you could suggest? I would prefer it in 4-DIP package if possible for space reasons.

thanks

Something like that.

That would be only when there is current. Whereas I want it to sound when it is merely turned on. I would put a speaker away from the assembly, near the front panel/.

It does, but not exactly when I want it.

It's not loud enough.