I'm looking to create something that requires a fair amount of torque so I rigged up a simple BC337 transistor connected to pin 12 with a 1k Ohm resistor which I used to switch a 4.5v motor on and off with a capacitor across it.
While this worked, it was not strong enough to do much other than power a fan, so I moved to 12v.
Unfortunately, my 12v motor needs about 1.5A and the BC337 I was using is only good for 0.8A
I also had different plans for it, so thought perhaps I could substitute four 3v motors in series.
In my search for another transistor I could use, I found I have a few MJE3055T and MJE2955T bipolar transistors in a TO-220 package.
I looked up the datasheet and found them rated for 10A 60v.
I've made this circuit which I think should work, but I have no formal education in electronics, so I am unsure of a few things.
The four separate motors will be driving a single shaft to increase torque.
My first question is obviously, am I missing anything? As I understand it, I need the diode to take care of back emf when the motors switch off. The capacitor is probably not necessary and I am currently using an electrolytic, but I read somewhere that I should use a polymer film capacitor instead.
The other thing I am unsure of is the values, how do I know what size resistor I should use, what diode to use etc?
Is there anything else to consider?
Should I add another diode before M1?
I'll be using python to create the code to run the motor and don't require help with that side of things.
I appreciate any help given.