Unijunction Transistor

Discussion in 'Homework Help' started by dgr, Jul 25, 2004.

  1. dgr

    Thread Starter New Member

    Jul 25, 2004
    what are unijunction's defects and how to test it?
  2. beenthere

    Retired Moderator

    Apr 20, 2004

    Your question is a wonderful straight line, but I'll resist...

    Like most other discreet semiconductors, they either open up, or go short. If you have a diode test function on your meter, you check for two PN junctions. The leads are base1, base2, and emitter, but I can't reacall the pin-out. I think they're all still in TO-18 cans, and probably left around since 1969, or whenever they ran off the last lot of 2N2646's.

    Actually, I had an oven that used a PUT in the temperature controller. It's just that conparators work so much better.