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Author Topic: reed switch and transistor?  (Read 4779 times)

mcorrade

  • Newbie
  • *
  • Posts: 18
reed switch and transistor?
« on: February 22, 2008, 10:23:07 PM »
Can someone point me to where I could find out how to wire up a transistor to my pulse motor so my reed switch won't burn out....

thanks a million

gyulasun

  • Hero Member
  • *****
  • Posts: 4117
Re: reed switch and transistor?
« Reply #1 on: February 23, 2008, 01:34:13 AM »
You can see the principle here:  http://www.simplemotor.com/tmotor.htm

to reduce base current it is advised to connect a 4.7 kOhm to 10 kOhm resistor in series with the reed switch.

coil here is in the emitter,  you may place it in the collector too.

be sure to use a transistor with correct current/voltage ratings for your task,  thinking of back EMF voltage pulse too.

Gyula