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Les,A BC337 is similar (But not identical) It has a slightly higher collector emitter current rating and hfe but it has a slightly lower power dissipation. I assume this circuit is a PWM motor speed control which is controlled from the parallel printer port of a computer. As it is a PWM control the transistor should not dissipate very much power as it should be either fully on or fully off. The circuit will only drive a small motor. Also there should be a diode in parallel with the motor to suppress voltage spikes due to the inductance of the motor winding. (Diode + to 5 volts - to collector of transistor.) I would also suggest reducing the value of the 1K base resistor to about 150 ohms to ensure the transistor is fully turned on.
Les.
I use to live in the Philippines. I was in the Navy stationed at Subic Bay, near Olongapo. That was back around 1980.I'm from Philippines.
Not really, the link for example may help others.Are we making too much of discussion , just on a relay drive transistor? The purpose is too simple.
Can anyone suggest for replacement of Transistor SL100 for this kind of cuircuit? Please help me. I'm from Philippines.
I need your thoughts and favorable reply guys. Thank you.