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latching reed switches

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  • Member since
    February 2007
  • 146 posts
latching reed switches
Posted by rustycoupler on Tuesday, August 19, 2008 1:55 PM
does anyone know, if i power a led with a watch battery for a passenger car could i use this to turn it off and on? also would it stay on until i pass the magnet over it againto shut it off?
  • Member since
    December 2004
  • From: Bedford, MA, USA
  • 19,688 posts
Posted by MisterBeasley on Tuesday, August 19, 2008 2:27 PM

Yeah, that's the general idea.

The reed switch is simply a toggle switch, generally single-pole, single-throw.  A "latching" switch will stay the way you put it.  A non-latching switch will revert to the OFF position once the magnetic field is removed.

It takes an iron man to play with a toy iron horse. 

  • Member since
    July 2003
  • From: Sierra Vista, Arizona
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Posted by cacole on Tuesday, August 19, 2008 5:31 PM
Yes, a latching reed switch is all you would need if you have the correct voltage battery.  A latching reed switch turns on and off according to which way you pass the magnet over it; i.e., one direction turns it on and the opposite direction turns it off.
  • Member since
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  • From: Pennsylvania
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Posted by nedthomas on Wednesday, August 20, 2008 8:21 AM
Latching reed switches come in two types. One is mechanical where the external magnet moves the reed over a center toggle and reversing the magnet resets it. The other uses a second magnet as "bias", i.e. the second magnet is not powerful enough to pull the reed but can hold the reed close after the external magnet closes the switch. Reversing the enternal magnet over powers the "bias" and the reed opens. You may be able the build your own using the "bias" method.
  • Member since
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  • From: Pittsburgh, PA
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Posted by dbodnar on Thursday, August 21, 2008 7:54 PM

I covered the various options to turn LEDs on and off (including latching reed switches) in an article I wrote last year.

Have a look

http://www.trainelectronics.com/LED_Articles_2007/LED_103/index.htm 

 Let me know if you have any questions.

 

dave

 

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