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suitable circuit for measurement RMS - Detector

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Vahab

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RMS Detector

Hi all,

I want to find suitable circuit for measurement RMS value and convert it to DC.

please help me.
It is important for me and i'm waiting to you.


Good Luck
vahab
 

Re: RMS Detector

See:**broken link removed**
The circuit may be build with cheap CA/LM3046 transistor arrays if the maximum collector current is reduced to 1 or 2 mA.

IC's implementing the same operation principle are available too.
 

Re: RMS Detector

Hi Vahab,

there is another quite simple solution involving a multiplier/divider IC (as far as I remember AD435) and a simple buffer circuit. Please give notice if you are interested.
 
RMS Detector

Reviewing this classical document, I was aware that Vahab actually didnt't mention if the application is kHz or MHz domain. For low frequency (e. g. audio) range, a log/antilog circuit, either as an IC or built from individual parts, is offering superior dynamic, for high frequency, only gilbert-cell multiplier circuits or thermal detectors are usable.
 
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