[sdiy] Clipping/Limiting output optimization

[Donald Tillman]

On Apr 9, 2013, at 1:00 PM, Justin Owen <juzowen at gmail.com> wrote:

> I'm trying to take the 2x op-amp output shown in the top half this schem:
> 
> http://www.sdiy.org/juz/non_inv_clip_01.pdf
> 
> and turn it into a 1x op-amp version.  Input is from in-circuit - most likely from another op-amp and output is to the outside world via 1K impedance.
> 
> Any problems with the second version, anyone like to offer a better version?


Off the top of my head...

The bottom circuit needs a resistor between the opamp and the diodes.

The bottom circuit really wants the zeners in series.

(With the fixes above) the output impedance of the bottom circuit will be changing over the course of the waveform, which might be considered antisocial behavior playing with other signals.

The clipping curves will be different.

  -- Don

--
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com