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Old 27th Nov 2020, 10:15 pm   #1
georgesgiralt
Hexode
 
Join Date: Jul 2008
Location: Toulouse, France
Posts: 403
Default Need A/C millivolt meter.

Hello,
I want to repair my old preamp/amp and I need a millivoltmeter for this. I own an old tube beast a CRC MV124. Alas it is not working any more and I won't debug it (due to lack of time, documentation, etc...).
So I need an adapter allowing me to measure between 1mV full scale to, say 50V full scale and display, either, on a Metrix 462C multi meter, or on a Russian galvanometer or on a Chinese multimeter. Bandwidth between 20 Hz to 20kHz will be plenty enough.
I thought I had a schematics somewhere using op amps but can't find it.
So do you, by any chance, have something for me ?
Thanks a lot in advance for your help and advice !
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Old 28th Nov 2020, 7:43 am   #2
Electronpusher0
Octode
 
Join Date: Jun 2016
Location: Bognor Regis, West Sussex, UK.
Posts: 1,238
Default Re: Need A/C millivolt meter.

Look out for a Levell TM3 ac mV meter, they pop up regularly on ebay and the price is usually reasonable.

Peter
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Old 30th Nov 2020, 8:58 am   #3
pbengtech
Pentode
 
Join Date: Jan 2009
Location: Birmingham, West Midlands, UK.
Posts: 182
Default Re: Need A/C millivolt meter.

Hi,
If you google “ precision audio Millivolt meter circuit “ you should be able to find a circuit suitable for you.
The one I found was on diy-electronic - projects.com
Hope this helps..
Phil b
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