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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Correct way to connect VU Meter
Correct way to connect VU Meter
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Old 14th December 2017, 10:38 PM   #31
cbdb is offline cbdb  Canada
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A VU meter is for line level signals not amp outputs. It's not a power meter. It measures voltage. Since speaker impedance can vary a lot with freq. so dose the amp power at a constant output voltage. The power output at the speaker resonance is a fraction of that at other freqs. even thou the VU shows the same reading.

Last edited by cbdb; 14th December 2017 at 10:40 PM.
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Old 14th December 2017, 10:44 PM   #32
cbdb is offline cbdb  Canada
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And it's for pro gear line levels, 10db hotter than consumer levels.
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Old 14th December 2017, 11:34 PM   #33
Max Headroom is offline Max Headroom  Australia
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Location: West Australia, near to the beach, natural ambient sounds mostly.
On his garage wall, my father has a pair of original Weston type VU meters mounted on a panel.
The source signal is tape output fedc into a volume control, rotary switch and an opamp stage feeding the meters via 3.6k resistor.
The switch selects variable sensitivity (vol pot) or preset absolute sensitivity.
The preset level is very useful for checking radio modulation levels and cdp output levels.
Both settings are useful for informative visual listening.
This arrangement could of course be connected to amplifier speaker outputs and a volume control or range switching set to provide appropriate sensitivity according to listening level.

The VU meter is useful for those trained in using it and indicates average levels and ignores short term transient signals.
The attack/decay characteristics effectively cause smoothing that corresponds quite well to perceived loudness.

It is interesting to watch a 'proper' VU meter displaying rock/pop music.
The REM track and some AC/DC tracks are interesting as a study on how highly compressed and limited such music can be and still portray textures and separation of instruments etc.
IIRC the REM track sits on essentially constant level for most of the song with a few dips of one dB or so, same with a couple of AC/DC tracks.

VU meters done right are fun to have around.

Dan.
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Old 15th December 2017, 03:20 PM   #35
reedcat is offline reedcat  United States
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Ordered one. Will give it a try.
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Old 15th December 2017, 04:28 PM   #36
Zelimir62 is offline Zelimir62  Serbia
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Quote:
Originally Posted by reedcat View Post
Ordered one. Will give it a try.
I hope they will work, I did not find the data for your instruments (resistance and current for full scale) .

Replace BAT43 with BAT46 schottky diode if you have more than 40W/8ohms amplifier.

Last edited by Zelimir62; 15th December 2017 at 04:43 PM.
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Old 11th January 2018, 01:32 AM   #37
reedcat is offline reedcat  United States
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Default received my board

It looks very different than what is on the AliExpress page. I wonder what the schematic is for this PCB. It seems to have more diodes.. maybe an improved version?

I will try to trace the board to get the schematic
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File Type: jpg vu-driver-bottom.jpg (454.1 KB, 164 views)
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Old 11th January 2018, 07:54 AM   #38
Mooly is offline Mooly  United Kingdom
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Correct way to connect VU Meter
Similar type of circuit but now using surface mount parts. Perhaps the extra pair of diodes are reverse biased across the meter for protection (or to absorb eddy currents).
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Old 12th January 2018, 09:09 PM   #39
Zelimir62 is offline Zelimir62  Serbia
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Quote:
Originally Posted by reedcat View Post
It looks very different than what is on the AliExpress page. I wonder what the schematic is for this PCB. It seems to have more diodes.. maybe an improved version?

I will try to trace the board to get the schematic

Have you discovered the schematic of this new PCB?
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Old 22nd March 2018, 04:06 AM   #40
HatlessChimp is offline HatlessChimp
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Just bought a couple of these VU meters and was wondering how I should wire them in to my LM3886 Gainclone Amp. Cheers
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File Type: jpg 20180322_135708-2268x3024.jpg (337.2 KB, 49 views)
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