Get specific VU-meter built, who call?

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Tokoma

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Jan 3, 2016
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1
Hello!
I intend to get myself a quality VU meter for “desk” usage. Could use some pointers in a good direction. I wrote everything down at once, so excuse the wall-of-text.

I say “get” a meter, since I intend to get others to build and I’ll pay. Thereof my questions below. I have modest experience in DIY electronic component handling, and I’ve chosen to focus on getting good at other things in life. I’m no car mechanic, I just drive – kindof.

The meter will be for desk studio usage (no rackmount), in front of screen and used for mixing/music making only, which is my main income. I’ve looked around for months and I can’t find a single meter sold commercially that will fit my needs.

So far the Sifam AL29 looks like the better price/performance/reliability option. It doesn’t meet the VU specification 100% (IEC 60268-17:1990) but very few meters do today. I haven’t found a reliable way to locate which meters supports the VU spec 100% or not.
Older meters - like Weston, Simpson, Dixson and others - seems to me more risky to get. No support, not much to do if meter performance is degraded by time, not knowledgeable enough to accurately measure performance, nor to adjust it if necessary etc etc). However, comments and suggestions about this are very welcome. I am after an analog style meter, not an LED one.

For these meters, I shall then need a circuitboard. Though I don’t see Sifam making/selling such products intended for their own meters? I suppose such a board is not difficult to build for anyone who knows what he’s doing. But I’m fearful that a poorly built- or inappropriate board will affect the meter performance, and also not provide me with a meter calibration function.
Also I can’t seem to find boards which offer ready-made connections to TRS/XLR, provide backlighting, and it will be a plus if the board is a small as possible (check out enclosure beneath).

What would you do to get the right kind of board?

Finally, the whole thing (meters + board) ought to be enclosed, into some kind of desktop stand.
The meters are intended to fit in under a computer screen, so the elevation of the enclosure will need to be quite low. Perhaps no higher than 2 inches or so.

The back end of the enclosure must not crowd the foot of the screen, so it needs to be very shallow too. Probably no more depth than ~2 inches. To save space (depth wise) I thought I wouldn’t put any connectors on the body of the enclosure. But instead, have two 1½ feet long XLR/TRS cables come out of the back of the enclosure.

I will also need the enclosure to tilt the meter displays, probably around 25-30 degrees, so that the displays face slightly upwards and are very easy for the eye to catch a glimpse of by just looking down for a split second.

This enclosure will need to get built, by a craftsman I guess. Wood or metal won’t matter to me. But if metal, I can only deliver a rough drawing of the idea, but I can’t deliver any accurate blueprint than the dimensions the manufacturer of meters and board shows.

This makes me unsure of what kind of metal craftsman is the right one to call to make this? Would you trust a sheet metal workshop or plater do it? Or just call blacksmiths around and see if they got the right equipment to do it?

Who would be the right one to do this?

Thanks for help/comments
/Tokomo
 
Hello Tokomo,

Some words of experience relating to your meter unit search.....

Sifam stopped supplying super-high-quality meters some years back. The price of the AL29 reflects this well, as the professional predecessor cost over twice as much and weighed at least 3 times as much due to its large magnet. The AL29 is a value-for-money fit-for-purpose meter. I have custom made high-accuracy metering units for a top-end studio; they are used in the mastering suites. Whilst we would like to use higher-spec meters, they are no longer available so the AL29 was the best available choice.

Sifam do not make driver cards for their meters. Canford Audio used to supply meter drive cards of various types; I do not know if this is still the case.

Most metering units that I have seen have been custom-made for particular clients (in the case of a big broadcaster, "custom" can mean a production quantity of hundreds). I regularly work on quantities as low as one. The point is that you are unlikely to find a standard driver board that meets all of your requirements - TRS, XLR, driver, backlight, calibration..... you are effectively seeking a custom product.

It looks to me that a 2-box solution is what would work for your requirements. Either meters + driver in one box and power supply in a second box, or, meters in one box and PSU + drivers in a second box. Both have their own pros and cons. In descending order, the 5 costs for a one-off unit are: mechanical design, enclosures, electronics design, assembly labour, electronics.

Trusting this helps.

Gareth.
 

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