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  1. M

    measure a voltage across of a dc motor

    hello,i am trying to measure a square wave(pwm) with amplitude 3V, so when i try to measure it with a multimeter across my motor,should i watch the next: Vmultimeter=3*sqrt(duty cyle) is it correct? because sometimes i am watching more than 3V on my multimeter across the motor about 3.7V but i...
  2. M

    pwm to control a dc motor

    hello,i am trying to control a dc motor (1.5-3) with a transistor 2n2222a, at the 555output i have (supply voltage-1)=7-1=6V and the circuit is attached my transistor has gain=40 and the maximum load of y motor will be 0.3A,so i need at my base a current at least I=0.3/40=7.5mA to get...
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