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my transistor gets hot, line follower/dark sensor

leonheard

Jan 25, 2013
12
Joined
Jan 25, 2013
Messages
12
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....
 

davenn

Moderator
Sep 5, 2009
14,127
Joined
Sep 5, 2009
Messages
14,127
how about showing us the circuit you are using
and some clear well lit pics of the construction so we can see if you have made any mistakes :)

without those, there's little we could suggest

Dave
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
And some specs on the motor would not hurt.

Bob
 
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