Solenoid Switching

Thread Starter

patycoop

Joined Jan 19, 2011
1
Need help to determine the npn transistor size and bias resistor resistance calculation for a curcuit the will drive a 12v 20 ohm dc soleniod.
The digital bias voltage is 5v for high 40ma max rating.
Any help would be greatly app.

See attached diagram.
 

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