before try with another transistor i saw that maybe i can do it with a power opeartional amplifier like follow voltage(3V) with 1A output,like this:
View attachment 62416
but i have this question:
if the supply voltage for the amplifier must be 5V,
why when i have supply voltage=6V with duty cycle 50%,the motor is already consumes the 0.3A maximum that it can? and i see too that the voltage at the output of the amplifier is higher than at the input,but it shouldn´t happen?
and i see too that if i increase the supply voltage for the amplifer to more than 6V,the motor is gonna comsume more current,why is this happen?