i just try about you said with my new transistor BD135:
when i have supply voltage 3V,motor consumes 0.3A with 100%duty cycle and for 50%duty cycle consume 0.26A. and of course the speed change too
it seems work well,but the 555 don´t have 4.5V of supply voltage as it need
so i need supply 5V to the 555,how could i do it with only one power supply and the motor can´t have across him 3V?
maybe about fix 2V at the emitter with a diode or something like that?
will i get with this in saturation: 2V emitter,2V colector
and in cut-off : 0V emitter,5V colector
do you know what i mean?