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rectifier disaster

Discussion in 'Electronic Design' started by Abstract Dissonance, Jan 28, 2006.

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  1. I made a voltage doubler rectifier and it blew my rectifiers ;/

    the components were

    1 Variac

    2x 4amp at 600V diodes (1N822 I think)

    2x 1000uF 200V caps

    all configured in a voltage doubler circuit

    I hooked my variac to the inputs and a DMM on the output to measure the

    I started at 0 volts on the variac and when to 70 and everything was ok(the
    voltage output seemed right).

    after about 70V I heard like a small pop or something and my variac started
    making a loud humming noise so I turned it off... a few seconds later I
    heard it make a click sound.

    I can't imagine why the diodes blew... I tested them using my TV
    oscilliscope think using the X-Y plot... they conducted both ways and acted
    like a short... another diode of the same kind looked different(at a loop at
    one side).

    Surely I didn't go past 4 Amps(my variac is only rated at 3 amps and it
    didn't blow the fuse) and definately not past 600V's.... maybe it had
    something to do with the caps? and surely I don't have to connect a load? (I
    suppose though that I did need some resistance in there to limit the current
    a little atleast? I didn't think about it at the time as I just copied a
    circuit in a book I had and it didn't have any resistors ;/).

    One thing I did was to cut in half one of the broken diodes and then I stuck
    them back together and it worked! ;) (well, showed the same plot as the
    working diode).

  2. Phil Allison

    Phil Allison Guest

    "Abstract Dissonance"

    ** No.

    ........... Phil
  3. oops... that was another diode I ordered ;/ crap ;/ heh. It was big so I
    thought it must mean it could handle a lot of power and voltage ;/ On
    well... there goes 41 cents down the drain ;)

    damn, now I realized why I got it... was for my 40V transformer ;/ oh well.
    (I only got 3 for some reason ;/ heh)

    I guess I learned my lesson to make sure what components I hook up.
  4. Mike

    Mike Guest

    Yeah, get some 6A10s and you're there.

  5. Guest

    Fuses blow at well above their rated ampacity, and take time to do so.

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