EDIT: DO NOT even think about using the naive example of a circuit to switch three phase. As someone rightly pointed out this is a complex issue and will almost certainly result in burnt finger or death :S without being a very competent engineer. I am a hobbyist and this was meant to get some feedback and guidance on the subject
EDIT: Just found out about triacs so replace NPN with triac. What else do I need to know about?
I am looking for some help in designing a very simple circuit using a transistor to switch a load based on a 300 hz pulse width modulation circuit. Could someone give me some guidance on values etc for the componenets.
I think the circuit should be something like this:
Could someone give me (ideally and I would really be very pleased) the values for RB, do I need that RL or is the motor itself the load? and do I need anything else?