[sdiy] 3 position switch help

[Grant Richter]

Put two diodes inside the feedback loop of two op-amps. One for  
positive, one for negative.
Then you have two precision halfwave rectifiers.

Invert the output of one, and sum it with the other for full wave  
rectification.
A quad op-amp would do the whole thing. And all the waveforms are  
available at the same time.

On May 19, 2008, at 8:16 PM, Paul Perry wrote:

> Very familiar indeed.
> That circuit makes me wonder though - is there a fairly elegant way  
> to make
> a three output peak rectifier (pos, neg, and full) so that instead of
> switching, you have the three options continuously available?
>
> paul perry Melbourne Australia
>
> -----Original Message from Dave Manley-----
>> Well lookie here at the fourth Google hit when searching "C&K 7211":
>> http://www.edn.com/article/CA6339250.html
>> The author looks familiar.  :-)
>
>
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