Multiple Transistor switches to control one relay

Ron H

Joined Apr 14, 2005
7,063
The 200mW spec implies that the coil resistance is R=V^2/P=144/0.2=720Ω. The current will be 17mA. 2N3906 or almost any other general purpose PNP will work. I would use 6.8k for the base resistor.
 

Thread Starter

Rickm

Joined Jun 24, 2009
20
Ron I just ordered all my parts I need, and a few extras, it will take 2 weeks to get so i will get it layed out on board, going to try strip board first, I have them at hand and if it won't work then photoresistive
 
Top