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ohh! thank you! i just realized that i'll be supplying power to teensy using usb port of my laptop...so if the above usage of transistor is correct, can i use the OTHER USB port of my laptop as a power supply to the motor? is there any issue?
Before any of us can answer your question you need to answer the question I asked, which is:How much current does your motor draw?
Do you need both speed and direction control, or only speed control? I can show you some pretty neatty, transistor based circuit, but tell me your needs first ;-)
I have a multimeter.. how can i find out how much current it draws?
well i need both..but direction control more importantly!
QuoteI have a multimeter.. how can i find out how much current it draws?Put a smallish value resistor in series with the motor to power supply. Then measure the voltage drop across the resistor and calculate the current using Ohm's Law.
Put a smallish value resistor in series with the motor to power supply. Then measure the voltage drop across the resistor and calculate the current using Ohm's Law.
okay, teensy gives me 5.00v..i connected a 330ohm resistor and motor in series... now the voltage across the resistor is 4.5v-4.6v..that make 0.014A... 15mA correct?but the motor is not working.. =s when i remove the resistor, it starts running again.. is that fine?