[sdiy] Fast envelope follower circuit needed..

[Tom Wiltshire]

If he's trying to get the envelope, he'd want to see a 100 second sine wave, wouldn't he, since that's what the volume curve looks like? Either rectified or not, depending on whether it was a 2 or 4-quadrant amplitude modulator you used.  Or am I missing something? - I can't imagine where you got square waves from.

That example wouldn't even be that difficult since you've got sufficient space (x100) between the modulation signal or envelope and the carrier, so you could filter at a very low frequency (say 0.02Hz) and recover the modulation signal.

T.

On 28 Mar 2013, at 17:19, cheater cheater <cheater00 at gmail.com> wrote:

> So what should happen when a 1Hz sinewave, amplitude-modulated by a
> 0.01 Hz sinewave, is fed into your box? Do you expect to get a 1Hz
> square wave? 2Hz square wave? 0.01 Hz square wave?
> 
> On Thu, Mar 28, 2013 at 1:44 PM, Jean-Pierre Desrochers
> <jpdesroc at oricom.ca> wrote:
>> Hi List,
>> I'm sure this has been already discussed in the past
>> but I'm looking for a fast envelope follower circuit
>> schematic to rectify an incoming +/-2.5v AC waveform
>> to a rectified 0-5v wave.. The wave frequency could
>> go as low as 1 hz and sometimes will not be symetrical.
>> Any circuits welcomed !
>> JP
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