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Old 24th June 2013, 01:58 PM   #1
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Default simple solution for VU-Meter

P { margin-bottom: 0.08in; } I want to add a VU-Meter (older type, analog, not LED) to my 2x20 Watt amp. I'm only interested in pure eye-candy, accuracy of the meter doesn't interest me. With pre-installed rectifier circuit (I hope cheap Ebay models include this) my ideal solution would be...the simplest possable parallel connection to loudspeakers, and I came accross this entry in the forum.....from "djoffe"
Analog VU meter driver
Now I need professional oppinion, if this method works, what values of series resistance would be appropriate? I've read elsewhere that a „Ballistics“ driver is essential...if this is so then I need an absolutely basic op-amp as a buffer. Where would I find a circuit that works on +14.5 Volts? Obliged for any help here, I'm out of my depth.
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Old 25th June 2013, 09:21 PM   #2
00940 is online now 00940  Belgium
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I've been there recently...

Most cheap meters on ebay aren't made for AC but for DC. They need extra rectifiers.

For pure eye-candy, try the one suggested bv gpapag in the thread linked above. You'll need to adjust the capacitors in // with the meter to get decent reaction.
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Old 25th June 2013, 10:47 PM   #3
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For gpapag's one-transistor circuit, would you know if, for a supply of 14.5 volts, the transistor could be a BC5478 or if not, any suggestions? And D1...what sort of diode?

Last edited by stoppage; 25th June 2013 at 11:13 PM. Reason: Grammar
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Old 25th June 2013, 11:16 PM   #4
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http://www.jlmaudio.com/AT51%20DIY%20VU.pdf

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Old 26th June 2013, 07:50 AM   #5
00940 is online now 00940  Belgium
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Originally Posted by stoppage View Post
For gpapag's one-transistor circuit, would you know if, for a supply of 14.5 volts, the transistor could be a BC5478 or if not, any suggestions? And D1...what sort of diode?
Any cheap small npn should do. A bc547 will be ok.

Since you're not after accuracy, I'd use a cheap schottky diode or even a 1n4148
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Old 26th June 2013, 06:06 PM   #6
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Originally Posted by 00940 View Post
Any cheap small npn should do. A bc547 will be ok.

Since you're not after accuracy, I'd use a cheap schottky diode or even a 1n4148
Right...great... I'm off to electronic suppliers.
I'll be back.....
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Old 26th June 2013, 06:08 PM   #7
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Originally Posted by Max Headroom View Post
the pdf isn't complete. Searching jlmaudio for complete version....
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Old 27th June 2013, 11:54 AM   #8
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The link works for me...2 page PDF.

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Old 28th June 2013, 03:02 PM   #9
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The link works for me...2 page PDF.

Dan.
Fig.1 & Fig. 3 are missing from the pdf. I still haven't found another source
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Old 28th June 2013, 04:19 PM   #10
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Default Try This....

AT51 DIY VU.pdf

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