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Old 12th March 2012, 09:30 PM   #21
cbdb is offline cbdb  Canada
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Quote:
Originally Posted by simon7000 View Post
?? Real VU meters only require a 3600 ohm resistor in series with the output to read correctly. You can adjust the value so that they will read 100% power on an amplifier. The special rectifier is part of a VU specifications.

???? Real VU meters have a 600ohm impedance, the 3600 ohm resistor will...
Oh I see, your using a VU (line level meter) to show power amp output. Actualy power amp voltage out, not power. (for power you need to know the current (and phase)).

Heres a real power meter.

Technics SH-9020
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Old 12th March 2012, 10:02 PM   #22
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Quote:
Originally Posted by cbdb View Post
???? Real VU meters have a 600ohm impedance, the 3600 ohm resistor will...
Oh I see, your using a VU (line level meter) to show power amp output. Actualy power amp voltage out, not power. (for power you need to know the current (and phase)).

Heres a real power meter.

Technics SH-9020
Actually unless it measures current and voltage it is not. However a peak reading voltmeter is always interesting. The log scale is also nice. But way way back Ballantine used to make AC voltmeters that used a meter with a log movement! You can still find these on eBay and the meters are nice large units!

Ballantine Lab Weston Panel AC Volt Meter/ Gauge Decibels Bakelite Daystrom 861 | eBay
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Old 12th March 2012, 10:38 PM   #23
Hugh is offline Hugh  Australia
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Originally Posted by a.wayne View Post
Ohhh OK ....

These are supposed to be real VU's too.....

Panel VU Meter TN-73 0dB=1.288V 76x59mm LED lamp NISSEI | eBay
They look OK too. Yellow LED lighting? Thats got to last longer than lamps!
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Old 13th March 2012, 12:06 AM   #24
a.wayne is offline a.wayne  United States
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Going to give them a try ...
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Old 13th March 2012, 02:27 AM   #25
sjh327 is offline sjh327  China
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Originally Posted by janneman View Post
Underdamped, the ballistics do not seem to conform to true Vu meter specs...
I appreciate your help
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Old 15th March 2012, 01:10 PM   #26
sjh327 is offline sjh327  China
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It's my works

Click the image to open in full size.
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Old 15th March 2012, 11:41 PM   #27
Hugh is offline Hugh  Australia
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sjh327
Very nice. That is just the use for them I have in mind. Modern but retro.
I have ordered a kit to play with. I have also invented a 4LED bar graph like your 4 LED one pictured, and use them often in my designs.
... Hugh
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Old 16th March 2012, 07:19 PM   #28
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I used such VU meters for mic preamps.

They look the same.
This is what I measured on the Vu meters I used
630 Ohm
190 uA displays 0 dBu
300 uA displays +4 dBu

Here is the interface I used to hook the Vu meter at the balanced preamp output.
Attached Files
File Type: pdf VuMeterDriver.pdf (5.9 KB, 203 views)
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Transistor junction temperature is not transistor case temperature.
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Old 17th March 2012, 07:53 AM   #29
Hugh is offline Hugh  Australia
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Mchambin
Balanced driver- Recon it would be good. How do the meters "Look" or behave? do they seem well damped and show a meaningful readiing?
I want to use them in a mini portable broadcast mixing console I'm designing & plan to build up. My 'reference' VU's are 1980's Kyoritsu animals of various sizes and they have good VU characteristics.
Hurry up Ebay so I can have a play!
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Old 17th March 2012, 08:15 AM   #30
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Hi, Hugh
I did this for my son who is an audio engineer.
He had 4 preamps to put in a rack and wanted to add 4 vintage look Vu meters.
He was perfectly happy with the look and most important the Vu display behavior.
__________________
Transistor junction temperature is not transistor case temperature.

Last edited by mchambin; 17th March 2012 at 08:20 AM.
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