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-   -   Opto FET compressor/limiter (http://www.diyaudio.com/forums/everything-else/115442-opto-fet-compressor-limiter.html)

fjpompeo 14th January 2008 04:32 PM

Opto FET compressor/limiter
 
I need a schematic of an audio compressor/limiter that uses a FET optocoupler like H11F1M used to control an automatic voltage amplifier or automaitc gain control. This will be used as a mic preamplifier.

Regards,

Fernando

jan.didden 14th January 2008 07:36 PM

There are several apps at THAT corporation's site.

Jan Didden

cuibono 14th January 2008 08:43 PM

also look up prodigy-pro forum:

http://www.prodigy-pro.com/forum/ind...5112b01722a8d6

dmfraser 17th January 2008 07:15 PM

Limiters
 
I found I could not get acceptable sound quality from FET limiters and switched to opto resistive ones several years ago. Using Vactec devices. THD in hard limiting dropped from the 0.2% range down to the .01% range. And even to get the 0.2% range with FETs took tricks that are considered proprietary.


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