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B&K Precision frequency counter 1803

Discussion in 'Electronic Equipment' started by zeitguy, Apr 11, 2006.

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  1. zeitguy

    zeitguy Guest

    This is an older model with no wall wart. Does anyone know the voltage
    and polarity of the miniplug power supply? How much damage could I do
    starting with 5 v dc tip positive? I have $40 in the unit, so I am not
    eager to fry it. Thanks for any help.
  2. Robert Baer

    Robert Baer Guest

    Sometimes using a DMM in the diode position will give the polarity
    ingo; other times a multimeter in 1K range will be needed for the
    polarity info.
    Another way is to take the case off and do xome circuit chasing; at
    times that bay also give a clue as to the probable input voltage.
    Ane then again, some meters have the voltage on a case label.
  3. zeitguy

    zeitguy Guest

    Thanks for the ideas. I took the case off and found an 6- AA cell
    battery holder inside, and the red lead from the battery holder and the
    lead from the tip of the power socket were soldered together, so it
    should be a 9 volt tip positive wall wart. In the meantime, I am using
    batteries, and it works great.
  4. zeitguy

    zeitguy Guest


    I opened the case and found a 6 cell AA battery holder inside with the
    red lead and the socket tip lead soldered together, so it should be a 9
    volt tip positive wall wart, I suppose. I wish all my other little
    mysteries were so easy to solve.
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