Okay got it Jinx.

Thanks,
Curious


--- Jinx <joecolquitt@clear.net.nz> wrote:

> > Why did you use 2 opamps to drive the piezo
> speaker?
> 
> > Curious.
> 
> Dear Curious,
> 
> It's part of the existing circuit. The first amp is
> a buffer for
> the ISD output (tone control omitted), the second
> amp is
> actually a 2W power amp for the speaker
> 
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