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previous: R.G. Another opamp is the simplest way. ... -- 8/3/1999 3:47 AM View Thread

Re: Anderton's envelope follower questions...

8/16/1999 2:02 PM
paul perry
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Re: Anderton's envelope follower questions...
With a simple half wave rectifier used in some followers, you can reverse the envelope voltage by reversing the diode (or switching between 2 diodes). Not in the Anderton one, because of how the led/ldr is.  
 
Anyone looking for an amp with a gain control from -1 to +1,  
 
see "The Art of Electronics" by Horowitz and Hill. I cant see how anyone can design anything without it.