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Old 17th September 2011, 11:23 AM   #41
Mooly is offline Mooly  United Kingdom
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It's best if you post a circuit of the device in question.

RF pickup is mostly caused by the front end transistors (either in a chip such as 741 or discrete) demodulating the RF carrier. Often the way in is via long and "loopy" wiring and PCB print.

Cures can be as simple as a ferrite bead slipped over the problem input lead or a simple R/C filter across the input.
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