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Old 17th March 2003, 10:27 PM   #1
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Default "tick tick tick" through my speakers

I installed a dual 500k pot in my motorcycle dash as a volume control for a MP3 / amplified speaker setup. Now I hear "tick tick tick tick" through the speakers when the engine is running. I was using an audio cable from Radio Shack with gold connectors and didn't have any interference until I cut the cable and addded the pot. Any suggestions? Is there something I can cover the pot with to sheild it from electrical interference?
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Old 17th March 2003, 10:55 PM   #2
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Hello,

I know that 3M makes an adhesive copper or aluminum tape which is designed for shielding. It is available in various widths and lengths.

Does the 'tick tick tick' speed up with a gain in rpm?

That's all the ideas I have.

KevinLee
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Old 17th March 2003, 11:29 PM   #3
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Default Tic tic tic...

Quote:
I installed a dual 500k pot in my motorcycle dash as a volume control for a MP3 / amplified speaker setup
The volume pot has to high a value...then the maximal output impedance is to high (125 K Ohm)

With this high impedance is easy to pick up noise...so change the pot to a log pot of 10K or 20K maximum...and the problem must disapear!

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Old 18th March 2003, 12:56 AM   #4
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There might be a slight potential difference between the motorcycle frame and the pot metal case. This could cause any noise in the frame to capacitively couple to the resistance element of the pot, maybe. Try insulating the pot thread etc from the cycle frame, and in particular, earth the pot metal to the shielded wire braid, but *only* if the pot is isolated from the bike metal frame first, otherwise the problem may become worse.
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