But, if you get the maths right you can actually mimic the response.
[I have audio and broadcast radio station background btw]
Been here before with this argument of course. So, it is possible to get the
same indication but that leaves the semantics to deal with.
And there are subtle aspects of the visual persistence of different displays to
deal with too.
The argument usually revolves around the substitution of standard moving coil
meters for the correct type. The original spec document is on the web. The
attenuator that 'must' be used and the standard levels topic gets quite
interesting.
[Talking about the way the indicated value on the meter when used in its most
sensitive setting got used as the way to refer to the actual level, rather than
the fact that the actual level was higher - I didn't tell that story very well;
have a look at the specs and the circuit and how the common useage developed.]
John Kaesehagen
Australia
----- Original Message -----
From: Instrument Resources of America
To: neonixie-l@googlegroups.com
Sent: Tuesday, January 24, 2017 6:52 AM
Subject: Re: [neonixie-l] IN-13 Lifespan
As far as I know, one can NOT build a bar-graph, or neon lamp style, LED, or
any other indicator type, of VU meter. (Perhaps you built a 'level indicator'
of sorts.) The very definition of a VU meter (at least the professional type)
involves the mechanical ballistic damping, and mechanical response of the
needle and the meter movement. Ira.
On 1/23/2017 11:41 AM, TheJBW wrote:
About 1.5years ago, I built this really nice stereo vu-meter using IN-13
bargraph tubes. About two weeks ago, one of the tubes made a "tink" sound and
the current control went away -- the tube stayed ignited, but the "bar" was
stuck at the bottom. I noticed that the spacer at the far end of the tube was
also suddenly free. I figured this was an unlikely failure, so I replaced the
tube the spare stock. Unfortunately, one week later, the tube on the other
channel did the exact same thing! I've attached pictures of my drive and power
circuitry -- the signal conditioning circuitry is omitted, but I think it
unlikely to be relevant. I figure something must be wrong with my circuit that
is causing early death, but I'm not sure as to what. Ideas anyone?
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