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Reduce the RF interference at voltage regulator

Discussion in 'Electronic Basics' started by Dummy, Aug 29, 2003.

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  1. Dummy

    Dummy Guest

    I have a voltage regulator circuit. A two way radio is operating near
    the circuit. When I probe the output voltage of the regulator, it
    seems like the voltage fluctuated in a great amplitude when the radio
    is transmitting. The RF inteference cause the voltage to go up and
    down. What can I do to reduce the voltage fluctuation? Is it advisable
    to put a few bypass capacitors at the voltage regulator input and
    output to bypass the RF frequency from 200-800MHz? Or something like
    putting a RF shield around the regulator?

    The capacitors should be chosen in such a way the they would cover the
    frequency bands stated above. What I am worrying is that the capacitor
    will load down the voltage regulator and causing output voltage to be
    slowed down. Any concern on the ESR of the capacitors as well? Please
  2. tempus fugit

    tempus fugit Guest

    If you haven't got any bypass caps at the in and out of the regulator, then
    yes, the first thing I would do is out some in. Try anywhere from 10 - 100
    uF paralleled with a .1 or.01 uF at both in and out. The bigger cap may not
    be necessary at the output, but I would put the smaller ones at both.

    Is the regulator in a separate enclosure from the radio circuit? If it is,
    put it in a metal box.
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