Newbie needs help designing transistor circuit to drive rela

[Dylan]

Could someone please help a newbie design a small transistor circuit to
drive a relay (wiring, value of resistors, direction of diode across coil)


I have a 2N5089 transistor

I have 2 relays that I want to drive (separate projects):

- Relay #1 is a NTE R74-11D1-5 (5V, 178ohm coil, 140mw)
http://www.nteinc.com/relay_web/R74.html

- Relay #2 is an NTE R12-14D5-6 (6V, 160ohm coil, .9w)
http://www.nteinc.com/relay_web/R12.html


What do you suggest for power supplies? Could I use the PC power supply
5v/12v for the circuit or am I better off with an independent supply?

In both projects I want to tap into an indicator LED on a separate circuit
for on/off condition of relay.

If you could give me a rule of thumb for calculating resistor values for
different relays I would appreciate it.


TIA