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Dirty-South Blues Harp forum: wail on! >
Question about a volume pot wiring
Question about a volume pot wiring
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rogonzab
1038 posts
Oct 18, 2017
6:56 AM
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Something strange happen to me just now.
I am installing a VC on my JT30
I followed the third diagram in this Lone Wolf page:
https://www.lonewolfblues.com/techmicpot.html
The soldering is good, no ground noises or anything, except...
When I put the vol open, there is max volume. That is OK, but when I put the volumen to the other way (closed) the mic still makes sounds. It is not fully closed.
Why is this?
I dont understand, because of the nature of volume pot (open -> closed) this makes no senese to me.
I am very intrigued about this.
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Sorry for any misspell, english is not my first language.
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Andrew
1701 posts
Oct 18, 2017
7:12 AM
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The third diagram simply puts a resistance between input and output when on min, so reduced signal.
The first and second diagrams short the output to ground, so no signal.
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Andrew.
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Last Edited by Andrew on Oct 18, 2017 7:12 AM
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1847
4498 posts
Oct 18, 2017
7:38 AM
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a crystal requires the correct value 1 meg or higher.
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SuperBee
5039 posts
Oct 18, 2017
1:41 PM
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+1 Andrew
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MindTheGap
2376 posts
Oct 25, 2017
3:02 AM
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I was interested to find that these unconventional wirings were being used. But they do make sense - each one gives different benefits. The third one, although it doesn't give you an on/off capability, would be good I think if you were concerned about losing tone from very hi-z mics. When fully on there's no extra load on the mic at all (good) and in fact the load gets less (more resistance) as you turn the volume down - also good.
You could choose the pot value to give finer control over a smaller range of volume, which could be useful I imagine.
Last Edited by MindTheGap on Oct 25, 2017 3:03 AM
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Andrew
1703 posts
Oct 25, 2017
7:31 AM
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Commercial wirings can be very unconventional.
I watched a docu on Marshall amps recently, and something in it gave me a suspicion that the designers were self-taught and had just guessed what to do.
Failing that, I know from studying electronics ca 1980 that, until then at least, all mic and speaker design was trial and error with no-one knowing anything for certain about how to design anything acoustic with predictable results.
Cars are the worst - in the mid Seventies I tried working out the circuit diagram of a (ca. 1970) car's electrics, and it was bat-shit crazy.
Currently I have a bass guitar which sounds pretty lousy with all 4 controls on max. The volume pots are wired a little unconventionally, but not so much that I want to change them. And, depending on which website you go to, it's the Gibson pattern of wiring. I think it's probably impossible to do it without having some small earth-loops somewhere, but I haven't given that idea serious thought yet. And the bass was so cheap, I may be trying to polish a turd.
Unless there's a dry joint on the wire that earths the tailpiece and thus the strings.
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Andrew.
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Last Edited by Andrew on Oct 25, 2017 7:36 AM
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