DC motor speed controller

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FMradio

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can i control the speed of hobby dc motor ??



will it work fine ??
 

Yes, the circuit it will work.
 

yes it must work but i think this simple circuit has some disadvatages like
the voltage drop across each transistor = 0.7
total loss = 0.7 + 0.7 = 1.4v
maximum voltage across the moter will never exceed 12-1.4 = 10.6v,
use heatsinks

the amplification will not be linear
 

    FMradio

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It will work but you won't want to run more than maybe
1W through that TIP31 without heat sinking, or more than
10W without a fan on said heat sink.

There are many people selling small PWM motor control
boards & kits, which are a lot more efficient. If this was a
battery-powered application you'd want to go that way for
much greater battery life.
 

you probably want to put a 25V 10uF capacitor between "C" and 0V

Mr.Cool
 

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