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Optointerrupter circuit help please


Kennymadscience

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help please, can someone help me design a circuit for timing a brushless dc motor, that uses permanent magnets on the rotor and electromagnet for the stator.

I want to use a opto interrupter that uses only small current to time it with, connected to a high voltage transistor to move the large current to pulse the electromagnet. The thing is, I will be using voltages that are from 120 volts DC to 2,000 volts DC to pulse the electromagnet, however the current will not be any higher than 100 milliamps for the pulse even at the 2000 volt range.
Should I just connect the optointerrupter to a whole bunch of darlington pair transistors to get that high of a voltage rating to pulse the electromagnet with? Or is the input base voltage going to get really high with all these transistors connected?
Can anyone draw a circuit for such a task? Any other suggestions? thank you
ken

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