abhishek singh wrote:
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you just have to control the base voltage, you can connect either a voltage devider at base cicuit, or a resistance/zener pair to drop the base voltage. this will reduce your power waste down by factor 1/beta.


abhishek

¿¿??
If you divide the voltage and you have the same current (transistor is conected in serial with motor) you loose as power as the motor.... and the the power of the base circuit (1/beta)
Power will be (2+beta)*(power of motor)