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Old 5th September 2013, 09:46 PM   #1
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Default Jumper wires & RFI in preamp

Iím thinking to simplify by bypassing my preampís balance and tape/source controls. If the jumper wire on the PCB is a bit long, rather than a two loose runs I could twist the L & R wires in order to gain more resistance to RFI, or even run each signal twisted with its own ground jumper merely for RFI resistance. Or am I over-thinking this?

(Iíve noted that most of the hookup wire in the preamp is double (signal/ground) and with the amp most is single run, which of course makes sense in that most of the preamp runs are related to an input or output socket.)
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Old 6th September 2013, 12:16 AM   #2
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Twisting only gains RFI resistance when the pair of wires being twisted are a signal's Send & Return wires.
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Old 6th September 2013, 07:53 AM   #3
AndrewT is offline AndrewT  Scotland
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Speed is right.
Twisting the L with R will increase crosstalk.
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Old 6th September 2013, 10:31 AM   #4
DF96 is offline DF96  England
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If it is in a metal case with few holes and seams then RF should not be a problem. RF gets in at inputs and outputs, not intermediate connections.

If in a wooden or plastic case then any connection, however short, can be an RFI problem so shield them all.
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Old 6th September 2013, 04:12 PM   #5
AndrewT is offline AndrewT  Scotland
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As I read it RF gets in at all connections and all holes/seams.
As frequency of the interferences gets higher, then the more troublesome they become.
Meaning quite short seams with non conducting edges let in mobile phone noise.
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Old 6th September 2013, 06:52 PM   #6
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Interesting info. Thank you for that.
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