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Easiest way to convert signal to sound

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Ignoramus14714

Jan 1, 1970
0
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.

http://igor.chudov.com/projects/Homemade-TIG-DC-to-AC-Inverter/08-GateDrive/

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

i
 
Ignoramus14714 said:
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.

http://igor.chudov.com/projects/Homemade-TIG-DC-to-AC-Inverter/08-GateDrive/

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

i

1. use piezo awd, just connect it straight on
2. use piexo as above, but connect its other lead to an inverted
version of your signal
3. use a 1 tr amp to feed a small speaker. Since its a square wave, all
you need is the tr to switch on/off, linearity doesnt come into it.

NT
 
T

Tim Williams

Jan 1, 1970
0
Ignoramus14714 said:
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.

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
 
I

Ignoramus14714

Jan 1, 1970
0
Well, you can take the signal output and run it to a transistor,
sure.

Something like that.
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!

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/.

Matter of fact, does the circuit "sing" much as-is?

It does, but not exactly when I want it.
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).

It's not loud enough.

i
 
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