T&L Publications

I have one set left of alarm contacts for doors and windows.. its the round drill in model.. drill a hole and shove one side in, mount the wired side to the inside framework aligned and wire it up.. can't seem to find them anywhere anymore.. ? any ideas? thanks..

A lot of companies still sell them.

I have a lot of the bi metal 2 piece contacts but I think "Door King" sells alarm systems as well as gate openers.

Also always try "all electronics".

One source would be closet door switches but I think those are mainly plunger types. Might even find one of those in the hardware store.

Another source is interlock switches for industrial equipment.

here are a few magnetic ones. Looks pricy.
http://www.sentrolindustrial.com/100_series.htm

You may find other alternatives in the switch section of Digikey or Mouser. I think I saw some optical based sensors in that configuration somewhere too.

A bit on the expensive side here but you get the point.
http://www.mouser.com/catalog/631/1617.pdf

Heres your best bet Figure E
http://www.mouser.com/catalog/631/1445.pdf

$2.75 each at All Electronics

http://www.allelectronics.com/cgi-bin/c ... Alarm.html

http://www.allelectronics.com/cgi-bin/i ... ITCH_.html

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Starting at $2.80
http://search.homesecuritystore.com/sea ... r+contacts

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Expensive but extensive?
http://www.gesecurity.com/portal/site/G ... lse&t=prod

THANKS.. again great response.. ordered the ones from Home Security Store for now.. probably try some from the other ones too..

got my alarm contact/magnets today.. they're perfect, a little small, I didn't read the measurments but looked at the picture, but they will work fine, probably better small anyway..