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D'oh, problem solved

Discussion in 'Electronic Basics' started by kell, Nov 17, 2005.

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  1. kell

    kell Guest

    I posted about not being able to get the IR2153 chip to work.
    I had a bad connection on the breadboard; pin 8 of the chip didn't make
  2. Paul Burke

    Paul Burke Guest

    Well I've just spent two days panicking over a couple of prototype PCBs
    that didn't work: two identical PCBs, same fault on each- must be in the
    design, eh? Went through every aspect with a fine tooth comb, the comb I
    use for my fine teeth, everything seemed right. Then, desperation, let's
    check all the (176 pin PQFP) connections. SAME LEG NOT SOLDERED DOWN on
    both PCBs. Being SM, it LOOKED OK.

    So, happy and triumphant now, though teeth a mess with not having been
    combed for a couple of days.

    Paul Burke

  3. CMOS circuits have a nasty habit of sort of working with lousy waveforms
    and terrible frequency response when you forget to connect the power supply.

    Fumes from the protection diodes and any high input states make it happen.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
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