Mid pot wiring question

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ic-racer
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Joined: Tue Dec 18, 2007 2:24 pm

Mid pot wiring question

Post by ic-racer »

I'm not sure if the mid pot should be wired as a variable resistor or as a voltage divider. #124 pictures (on the left, below) show what looks like wiring as a variable resistor to ground.

The other picture on the right (unknown serial #, 'dogydoo' picture) shows wiring as a voltage divider.

Just wondering what the most common wiring is. Did HAD forget to make the extra connection on #124, or was this intentional?

Currently I have mine wired as a variable resistor, like the second photo.

(I searched the previous #124 threads but could not find a discussion of this)
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Normster
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Re: Mid pot wiring question

Post by Normster »

Whether you connect the input to the wiper or not, it still functions as a variable resistor. By wiring like the first photo, it ensures that you'll have 100k (250k?) to ground if the wiper contact fails. Since that's an unlikely scenario, I doubt that it matters. :lol:
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ic-racer
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Re: Mid pot wiring question

Post by ic-racer »

Normster wrote: I doubt that it matters. :lol:

:oops: I drew out the schematics, and you are right, it does not matter.

The reason I was double checking my control wiring was that the mid control does not do much. But now I know it is not because of the wiring.
Pete
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Re: Mid pot wiring question

Post by Pete »

ic-racer wrote:The other picture on the right (unknown serial #, 'dogydoo' picture) shows wiring as a voltage divider.
I think neither pic shows a voltage divider. If two of the pot legs are connected together OR any are not connected, it can not be a voltage divider. The two pics/methods shown are essentially identical (basically what Norm said)
ic-racer wrote:Just wondering what the most common wiring is. Did HAD forget to make the extra connection on #124, or was this intentional?
My experience/assumption is that not connecting the third pot lug is an older method of wiring a voltage divider which has evolved into the current practice of connecting it to the wiper. Either method functions the same, electrically. (Just elaborating on what Norm said)
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