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safety concern with power supply and breadboard

Discussion in 'Electronic Basics' started by jlintz, Jan 6, 2004.

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  1. jlintz

    jlintz Guest

    I recently finished putting together a Elenco Precision Deluxe
    Regulated Power Supply (model xp-620). I also just purchased a 50 in
    1 electronics kit as I would liek to create some circuits to learn
    more. I noticed that the output of the power supply is 1 amp. When I
    was working with the breadboard I had been using a 9volt battery to
    power it. I am concerned that it is not safe to be working with 1 amp
    on an open breadboard. Is there a way I can modify my power supply to
    output a safer amperage where I wont be putting myself in any danger?
     

  2. You are not in any danger. At least, no danger that you need to worry
    about.

    The supply you have claims something like +/-15V which taken together is
    30V. That is still quite safe to play with. You would have a very
    difficult time dieing from that.

    The "1 amp" claim isn't something to be afraid of. A fresh 9V battery can
    crank out several amps if you short circuit it.

    If you do something wrong with your circuit it is possible to melt your
    breadboard (and maybe sustain minor finger burns if you touch it) with this
    kind of output power capability, but don't be worried about electrocuting
    yourself with it.
     
  3. jlintz

    jlintz Guest

    Ok another quick question. I was measuring the voltage output using
    my multimeter that is safe for up to 400 mA. When I first did it , it
    worked fine but then I was getting weird results on everything so I
    figured I blew a fuse. I replaced the fuse on the multimeter and
    tested it out on a 9 volt battery and everything was working good.
    Went to test the output voltage again and again weird results or 0.
    Any idea what could be going wrong?
     
  4. This sounds like the classic "measuring volts set on current" trick. Since
    you mention 400mA current rating and volts in the same sentence I'd gues you
    may well be confused??
    Apologies if not but in measuring volts there is very little current fowing
    by design. Check your settings when measuring the voltage ie make sure that
    the probes are in the "volt" sockets and an appropriate range selected.
     
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