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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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Jan
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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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Old 24th April 2016, 05:45 AM   #6
prasi is offline prasi  India
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Quote:
Originally Posted by Vrystaat View Post
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.
hi,
i am trying make a circuit based on the link you provided for stereo application and the same is attached. it would be nice if someone could comment on the same.
reg
prasi
Attached Images
File Type: png VU CKT.png (26.9 KB, 451 views)
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Old 24th April 2016, 11:17 AM   #7
olafk is offline olafk  Germany
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Quote:
Originally Posted by Tajzmaj View Post
This one might work for you.
Cheers
VU And PPM Audio Metering
I built this also - Rod Elliott Project 55. Works very fine.
I can upload PCB if needed.

regards Olaf
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File Type: jpg VU_Elliot_01.jpg (372.4 KB, 426 views)
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Old 24th April 2016, 11:48 AM   #8
olafk is offline olafk  Germany
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Here are the files. The diodes I used are BAT46.
Have fun

regards Olaf
Attached Images
File Type: jpg VU_PCB_01.JPG (305.9 KB, 401 views)
Attached Files
File Type: zip VU.zip (54.6 KB, 71 views)

Last edited by olafk; 24th April 2016 at 11:52 AM.
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Old 24th April 2016, 01:08 PM   #9
prasi is offline prasi  India
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Quote:
Originally Posted by olafk View Post
Here are the files. The diodes I used are BAT46.
Have fun

regards Olaf
Hi Olaf,
Thanks a lot. I will this one.
reg
Prasi
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Old 24th April 2016, 02:28 PM   #10
olafk is offline olafk  Germany
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Little video.
https://youtu.be/ZuXf2pchZpA

regards Olaf
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