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Old 25th February 2011, 05:24 PM   #1
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Default Potentiometer Connection Help

Hi all,

First off let me say sorry if this thread should be in another section and that I have done some research but to no avail.

Basically I am looking at modifying a cheap headphone amp I have and so I am drawing a schematic for it to have as a reference. The problem I have come across is how the volume pots are connected. Going by this http://sound.westhost.com/pots-f6.gif pin one of each resistor should be connected. But when continuity tested there is a connection between pins 1 and 2 of resistor 1 and a seperate connection between pins 1 and 2 of resistor 2.

Could some help me to understand why this is done or atleast lead me in the direction of some reading? Ifyou need anymoreinfo please ask and thanks for your time.
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Old 26th February 2011, 01:15 AM   #2
Minion is offline Minion  Canada
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I don"t really understand your question as I don"t see any resistors just Pots .....

All the Pins of a pot are connected internally ...... Therefor you will get continuity no matter what 2 pins of the pot your are testing ......

In a dual pot that is wired as a dual volume controll you will get continuity between all the pins of both pots because both pots have a common ground connection and are therfor connected together .....

I don"t know if that is the answer you are looking for , if it isn"t maybe elaborate a bit more on what you want to know ....

Cheers
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Old 26th February 2011, 03:23 AM   #3
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Measuring with a continuity meter you shouldn't see continuity (v.low resistance) between the 3 pins of a pot, if the wiper is set to the mid position.. If, OTOH, the wiper is set to the end of its travel, then the resistance between it (the middle pin) and one of the other pins will be v. low.

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Old 26th February 2011, 09:01 AM   #4
Enzo is offline Enzo  United States
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Or perhaps...

One of the examples was a stereo connection using a dual pot. The example circuit showed pins 1 connected together. However, the pot all by itself has no connection between the two pin 1 terminals. You make that conection in the wiring.
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Old 26th February 2011, 09:15 AM   #5
Mooly is offline Mooly  United Kingdom
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The pot is a single resistor. Think of something like a pencil lead that is a little bit conductive.

In the diagrams (and those numbers are pin numbers not resistors) pin 1 would be one end of the lead, and pin 3 the other. Pin 2 is a sliding connection that moves from one end to the other or what we call the wiper.
If you got pins 1 and 3 reversed the pot would work "back to front"
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Old 28th February 2011, 04:26 AM   #6
Enzo is offline Enzo  United States
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The third example in his link is a dual pot, two resistors.
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Old 28th February 2011, 07:20 AM   #7
Mooly is offline Mooly  United Kingdom
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This is all I see in the link. No resistors.

Sometimes a fixed resistor is added between wiper and ground to give a "fake log" law allowing better matched linear pots to be used... but none of that is shown.
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File Type: jpg Pots.JPG (31.0 KB, 144 views)
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