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Subject: relays through NPN transistor

Date: 08/28/03 at 2:09 AM
Posted by: sheen
E-mail: vehona_princess[AT55]yahoo.com.sg (replace [AT55] with @ to reply)
Message Posted:

I've a pic16f877 feeding to the base of a NPN 2N2222 through a ??? resistor(may I know how to calculate?) Emitter is tied to ground & collector is going to one leg of relays(Aromat 612 16B, 5Vdc) The other side of the relay is tied to 5Vdc. Voltage to base is 5Vdc.

1.) May I know what's the suitable value for the kick-back suppressing diode in this case?

2.) What should be RB value (base-resistor)?


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