need help with a power transistor

Discussion in 'General Electronics Chat' started by dwoodard27, Aug 7, 2010.

  1. dwoodard27

    Thread Starter New Member

    Aug 7, 2010
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    0
    How do you step up a power transistor that will be coming from a nor gate which is in line to a relay. I need to step up the voltage from 5 to 12 volts in order for the relay to trip. Nominal current of the relay is 30mA.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    connect gate via 1k to transistor base of BC639, a 4.7K from base to GND, Emitter to GND, collector to one side of relay coil and apply 12V to the other end of coil. Next connect a 1N4007 Diode across the relay coil, cathode of D going to +12V side of coil
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    This is not the forum to ask this kind of question, it should have gone into the electronic chat forum.
     
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