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Old 8th January 2013, 01:06 PM   #1
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Default Analog VU meter driver

Gooday all,
Can anybody help with an easy driver circuit to drive analog VU meters. The amp has an output of +- 100watt and the meters I got from a Sony product. Their resistance is 1200 Ohms.

Thanks
Jan
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Old 8th January 2013, 06:27 PM   #2
Tajzmaj is offline Tajzmaj  Slovenia
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This one might work for you.
Cheers
VU And PPM Audio Metering
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Old 9th January 2013, 01:47 AM   #3
djoffe is offline djoffe  United States
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If the meter has the rectifiers built in, then a series dropping resistor might be enough to get you going. If you needed a few different ranges, it could be a switch and a resistor.

Just for easy numbers, assume 0 VU on the meter was set up for 1 V rms.
A 100 Watt amp puts out about 28 Vrms max. If you wanted the 28 volts to correspond to 0 VU, put a resistor of 27*1200=32400 in series.

The meter, with such a resistor would probably never move until the volume was really high...so, that's where you might want a range switch...

you could even use "decade engineering". Throw a decade resistor box in series with the meter, all of which is hooked across the speaker terminals...adjust the R downard from 33K until you have the desired sensitivity.

Akitika GT-101

Last edited by djoffe; 9th January 2013 at 01:48 AM. Reason: typos.
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Old 10th January 2013, 02:28 PM   #4
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Default VU driver

Thanks for the reply's you all,
I found an easy circuit, I've tested it and it works fine ! Circuits Online - Schakelingen - VU meter It seems to work from the line inputs.
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Old 10th January 2013, 02:42 PM   #5
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Nice one that one Vrystaat.
The 470uF(C4) directly to the meter will make most meters "hanging" up there.

Would not hurt to experiment a little with that one.
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