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Old 18th March 2012, 12:10 AM   #31
Hugh is offline Hugh  Australia
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Grin - How come you're doing the work for your son - He's the engineer?
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Old 18th March 2012, 05:30 AM   #32
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Originally Posted by Hugh View Post
Grin - How come you're doing the work for your son - He's the engineer?
He is an audio engineer:
An audio engineer, also called audio technician, audio technologist or sound technician, is a specialist in a skilled trade that deals with the use of machinery and equipment for the recording, mixing and reproduction of sounds.
Audio engineering - Wikipedia, the free encyclopedia
His field is sound, not electronic design.
Transistor junction temperature is not transistor case temperature.

Last edited by mchambin; 18th March 2012 at 05:59 AM.
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Old 18th March 2012, 05:38 AM   #33
Hugh is offline Hugh  Australia
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Sorry, I was being smart, implying your son as an engineer, has design skills.
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Old 3rd April 2012, 03:19 AM   #34
Hugh is offline Hugh  Australia
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Well I've recieved a couple of these little VU's and the driver PC board ... and had a play.
1. They are rather cute; 12V 45ma festoon globe buried inside look nice on 10v
2. I checked them out with the supplied driver PCB. Quite meaningful displays.
3. I like whats displayed though it is certainly not "VU" of old. They show whats happening to below -40dB as you would expect using the TA7318 driver.
4. With this driver they certainly dont overshoot like some so called VU meters do.
A good little product and with a simple LED display as demonstrated in sjh327's product would be an excellent measure of true audio levels.

I'd like to redesign the driver for a bit more sensitivity and + - 15v sullpies.
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Old 13th September 2012, 11:43 PM   #35
sjh327 is offline sjh327  China
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Location: tieling
new work

Click the image to open in full size.
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Old 16th September 2012, 09:11 AM   #36
Hugh is offline Hugh  Australia
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Very Nice!
Have you described the LED barograph part you are using anywhere?
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Old 15th February 2013, 05:49 AM   #37
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Hey there!

Greatly appreciate any hint on where to find a replacement for a Shure m67's original VU meter. I'd replace the meter's entire buffer/driver part, as well, if only the dimensions are met. The original parts list suggests a 190uA meter and the dimensions are 35x35mm. There's also a calibrating rheostat within the circuit; should i get it replaced, as well? (And if yes, how'd I find the right bang-for-a-buck balance with this one?)

The specification also mentions that the original buffer is not completely isolated from the headphones output (low resistance phones are going to affect the metering by a couple of dB). Is there a remedy for this issue?

I pursue this as a part of my current project: to upgrade the original m67's design with today's high-end components (with some re-vamping, for it to expose four isolated mic outputs), and i am only stuck with getting a solution for precise metering. I appreciate any help!
(Provided that after the unit is ready, i promise to publish a guide for those interested in upgrading this beast).
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Old 15th February 2013, 06:34 PM   #38
rsavas is offline rsavas  Canada
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Location: Ontario
Elektor had a article recently, making a VU meter, using a Russian linear nixie tube and a programable analog chip, looked really neat. Easy to assemble, have a look.

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Old 18th February 2013, 01:30 PM   #39
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I have found some info on They also sell some VU meters, as well as buffering PCB's for them.
Thanks for your reply!
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