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Potentiometer confusion.
Potentiometer confusion.
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Old 13th March 2018, 06:00 PM   #1
Brett1980 is offline Brett1980
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Default Potentiometer confusion.

Not sure if this is in the right place, apologies if it is.
I'm in the process of completing a hidden audio system in my car (its a classic so trying to retain period looks) so far its a simple setup, switched jack plug for aux in and a Bluetooth unit hidden behind the dash, the BT feeds into the jack plug and the jack plug outputs go to a stereo audio log pot.
Just getting round to attaching the phono's for in and out feeds and in running a meter over it I think there may be a problem, it seems my left and right input are working in the same manner as the input and output should be (they still work correctly) measuring ohms between the left and right input, turning the pot I see between 0 and its max, struggling to figure where I've gone wrong.

From the stereo jack my left output goes to pin 2 on the pot, the right jack output to pin 5 on the pot, pot outputs are from pin 3 and 6, as for earths the stereo jack has one output so that is linked to pins 1 and 4, these then link out to the phonos as well...

Is the earth side wrong and causing this?
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Old 13th March 2018, 06:35 PM   #2
scottjoplin is offline scottjoplin  Wales
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I can't be certain due to your numbering of the pins but it sounds as though you have the pot inputs and outputs reversed, the output is from the middle of the three pins. A picture would help
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Old 13th March 2018, 09:35 PM   #3
Brett1980 is offline Brett1980
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I do, seems I followed a wrong diagram, my inputs are on the centre pin and the out to the amp on the outer pin, would that cause me to see a varying resistance linked to wiper position between the two middle pins?
Click the image to open in full size.
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Old 13th March 2018, 09:37 PM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by Brett1980 View Post
I do, seems I followed a wrong diagram, my inputs are on the centre pin and the out to the amp on the outer pin, would that cause me to see a varying resistance linked to wiper position between the two middle pins?
Click the image to open in full size.
You have it wrong but the diagram has it right.
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Old 13th March 2018, 09:40 PM   #5
scottjoplin is offline scottjoplin  Wales
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You'd see that because the shields of the two channels are connected
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Old 13th March 2018, 10:47 PM   #6
Brett1980 is offline Brett1980
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Quote:
Originally Posted by nigelwright7557 View Post
You have it wrong but the diagram has it right.
Yes seems most image searches show this way, unfortunately I followed the first web link which was a wikihow page which describes the second terminal as input and the third as output... I'll correct this now.

Quote:
You'd see that because the shields of the two channels are connected
Is this going to create an issue or just normal?

Really appreciate all the advice and pointers.
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Old 13th March 2018, 10:52 PM   #7
scottjoplin is offline scottjoplin  Wales
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Perfectly normal, the shields are "ground", so no issues
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Old 14th March 2018, 01:17 AM   #8
Brett1980 is offline Brett1980
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Stripped back and redone centre pin out, side pin in, thanks all, also given up on running the multimeter between wires other than the in and out channels as I have a feeling the outputs would still confuse me.

Click the image to open in full size.
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