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BrianG · 08.02.2011, 02:17 PM

Couple of things:

I hope you plan to use a Schottky diode for your back-EMF protection. Otherwise, it might not shunt the emf quick enough to protect your transistor and/or power source. Also, make sure Q2 has a C-E voltage of at least 500v.

How about using an optical switch instead of mechanical. Purely for reliability from a mechanical standpoint; just an LED and photosensor that triggers when the projectile breaks the beam.

	(#5)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	08.02.2011, 02:17 PM Couple of things: I hope you plan to use a Schottky diode for your back-EMF protection. Otherwise, it might not shunt the emf quick enough to protect your transistor and/or power source. Also, make sure Q2 has a C-E voltage of at least 500v. How about using an optical switch instead of mechanical. Purely for reliability from a mechanical standpoint; just an LED and photosensor that triggers when the projectile breaks the beam.