my transistor gets hot, line follower/dark sensor

Discussion in 'General Electronics Chat' started by leonheard, Feb 1, 2013.

  1. leonheard

    Thread Starter Member

    Jan 8, 2013
    48
    0
    hi!

    i have almost made a line following car (toy) but i have 1 problem.... my transistor gets hot after a while... am using about 7 volts power supply, i have 2 transistor as a darlingon " bc337 transistors "( when i put the light off the dc motor run very fast like i want ) but when i touch the transistor 2, is hot! )

    then i changed the transistor 2 to a 2N2219 ( it was working okei, but also hot, and i think its broke, cuz it doesnt work anymore :( ) then i used a BD243 transistor, its still alive, but it gets hot 2,

    i use resistors, so i dont know what to do....
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,993
    3,229
    Since you didn't post the circuit diagram, all I can suggest is that you put a heatsink on the transistor getting hot.
     
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