Re: Simple audio signal to level convertor?

Bob Eld wrote:

> "Eeyore"  wrote
> > Bob Eld wrote:
> >
> > > Insure that the max peak of the audio signal is within
> > > the ADC range.
> >
> > Diode clamp it !
> >
> > Graham
>
> Yeah you can clamp it but then you loose that and higher values as
peaks.
> The whole idea is to convert the peaks to numbers not to clip them off.

You can actively diode clamp. Just don't want to hurt the poor ADC 'just
in
case'. I doubt that for flickering lights, losing anything below say 0x240
will
hurt any


> There's really no need to clamp it. The processor input will have
internal
> "diodes" that will keep the voltage from exceeding  the rail voltage
plus a
> little.

A discussion we've had many a time before here !


> Likewise the input voltage won't go below ground.

It WON'T ? In what ideal world is this ?


> A series resistance should be added to limit the input current and a
shunt
> resistance
> added to keep the DC level from ****fting up due to rectification by
these
> clamps.

Uh ?

Graham