[ProAudio] VU meter permitted overdrive with a sine wave...
bobkatz at digido.com
Thu Jan 28 10:54:07 PST 2021
Thanks, Crispin. So it looks like +6 VU at 1 kHz Sine for a minute or
two ought to be acceptable. Not comfortable, but acceptable.
On 1/28/21 1:47 PM, Crispin HT wrote:
> The Sifams we use are a taut band design – a rectangular wire takes
> the current in and out of the coil, suspended in a magnet.
> The torsion on the wire counters the electric force to make the meter
> stop at the desired level.
> When you overload it, the meter needle stops the coil from rotating
> anymore, and as you pass more current through it, the coil will start
> to move away from the centre of the magnet, stretching the taut wire,
> and potentially grounding the coil on the magnet.
> My guess is you can put a lot more than +6 into it without damage for
> a period of time, a bit like heatsinking on a semi, high overload for
> a short time, low overload for a long time.
> I’m guessing + 12VU should be OK for a longish period ( 4 x voltage,
> 16 x power), but YMMV
> Kind Regards
> *Crispin Herrod-Taylor
> **Managing Director, Crookwood**
> *www.crookwood.com <http://www.crookwood.com/>
> /Tel: +44 (0)1672 811 649
> Mobile:+44(0)7910 637 634/
> */Sign up for our great newsletter here
> <http://crookwood.com/newsletter/>!/**and keep up to date with the
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> *From:*ProAudio <proaudio-bounces at bach.pgm.com> *On Behalf Of *Bob
> Katz via ProAudio
> *Sent:* 28 January 2021 17:27
> *To:* proaudio at bach.pgm.com
> *Subject:* [ProAudio] VU meter permitted overdrive with a sine wave...
> This list has been remarkably silent, but I am very grateful that it's
> around when I have a question to ask AUDIO EXPERTS.
> Who here knows the acceptable rating of a standard mechanical VU meter
> above 0 VU with a sine wave? If I recall correctly, they are designed
> to accept as high as +6 VU or even higher. For example, when doing
> testing of a tape recorder for headroom. It's still ideal to shut off
> the meter, but in some cases that's not possible.
> Thanks and happy New Year!
> If you want good sound on your album, come to
> Bob Katz 407-831-0233 DIGITAL DOMAIN MASTERING STUDIO
> Author: *Mastering Audio*
> Digital Domain Website <https://www.digido.com/>
> No trees were killed in the sending of this message. However a large
> of electrons were terribly inconvenienced.
If you want good sound on your album, come to Bob Katz 407-831-0233
DIGITAL DOMAIN MASTERING STUDIO Author: *Mastering Audio* Digital Domain
Website <https://www.digido.com/> No trees were killed in the sending of
this message. However a large number of electrons were terribly
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