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Solid State Relays and EMI

Discussion in 'General Electronics' started by David Harper, Jul 24, 2004.

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  1. David Harper

    David Harper Guest

    Which pins are you suggesting I apply it across? Input ground to output ground?

    Dave
     
  2. "David Harper" ...
    ground?


    Yes. The basic idea is to minimize the RF voltage occurring across the
    isolation barrier by shorting it with the cap.
    Input GND to output GND is best, to other points it might cause other EMC
    problems.

    It _may_ help to also put a ceramic 1nF cap across the output. This lowers
    the RF voltage across the FETs, half of which would be present at the output
    side of the isolation barrier. But it will decrease the output impedance,
    so it's a second choice solution only.

    Regards,
    Arie de Muynck
     
  3. legg

    legg Guest

    Mercury-wetted?

    It's OT gents.

    RL
     
  4. legg

    legg Guest

    I think he meant to the common terminal (pin5), from various places in
    the circuit, including possibly an input drive rail.

    RL
     
  5. Tim Shoppa

    Tim Shoppa Guest

    Tubes move electrons to function, semiconductors move holes to function :).

    Tim.
     
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