And there's a little problem I can't understand the cause.
When I put 4V on the output pin(PWM), the transistor is almost full-open and the motor (no-load) consumes about 500mA. And everything seems perfect. But when I connect some load to the motor (e.g. propeller, wheel) and turn the pin for about 1.6V, the motor consumes same 500mA, but this time transistor goes hot very quickly and starts fuming =.
The transistor is TIP41C (6A maximum current)
Can anyone tell me what's the reason for this effect. Is there anything more important than current and voltage? Thanks 