Convert 5v 20mA to 12v 0.4Amps

Question

I am going to be making a 3d printer and i have made a circuit to control it. However, the stepper motor is 12v 0.4amps and the circuit is 5v 20mA. I need a way to amplify, but if you can show me, please give me the fritzing file, not something like eagle or PDF. This is because i am making the circuit with fritzing.

You can't get 4.8W (12V*0.4A) out of 0.1W (5V*0.02A). You need to use the 5V signal to control the stepper, but you need a separate power supply to power the stepper. — I. Wolfe, Dec 06 '15 at 16:56
What do you mean by "the circuit is 5V 20mA"? Where did you find these numbers? — jippie, Dec 06 '15 at 18:29

score 3 · Answer 1 · answered Dec 06 '15 at 16:46

Ok, first thing you must know: you cannot get power out of nowhere. Power is voltage times current, so if your input P is 5*0.02=0.1W, then your output P will not be more than that, whatever you do.

So tell us more about what you have, maybe we come help better than "it's impossible"

Convert 5v 20mA to 12v 0.4Amps

1 Answers1