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power supply

Discussion in 'Electronic Basics' started by Peyter, Nov 14, 2003.

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  1. Peyter

    Peyter Guest

    I have a question about a power supply which i have:
    When I increase the voltage above 6V I hear a 'click'
    from inside the psu. I was curious to what it was, so
    I opened the cover and found the there is a relay
    inside. What could be the reason for this ?
  2. Lord Garth

    Lord Garth Guest

    It's probably some form of over voltage protection.
    I had some open frame power supplies that would
    not power up. Its electronic crowbar was set too low
    and this prevented the supply from truning on. There
    was an adjustment for the trip voltage though so the
    fix was easy.
  3. Many linear supplies have a tap changer circuit that selects different
    transformer windings as the output voltage is changed to minimize the
    waste heat produced by the regulator.
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