Tip3055

Discussion in 'General Electronics Chat' started by Montgue, Jul 30, 2013.

  1. Montgue

    Thread Starter New Member

    Nov 16, 2011
    8
    1
    Hi all, Can anyone help me, i need to test a tip3055 in circuit of a power supply i dont know if it is working. I have an el cheapo vom. how do i go about this thanks for any help:)
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,415
    3,354
    You have to remove the 3055 or at least disconnect two of the three pins from the circuit in order to perform simple resistance checks.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    In circuit? As in, without removing it from the PCB?
     
  4. #12

    Expert

    Nov 30, 2010
    16,248
    6,745
    Put some reasonable amount of load resistor on the power supply. 10% of its ability will work. Measure from ground or common to the collector to see if you have main voltage available. Next measure ground to base to see if a drive voltage is present. Finally measure ground to emitter to see if its voltage is about .5 to .7 volts less than the base voltage.
     
  5. Montgue

    Thread Starter New Member

    Nov 16, 2011
    8
    1
    Thanks to all i thinki have it now