Magnetic Contact Switches

[machavelli]

i have some normally open magnetic contact switches and i need normally closed, how would i change them? relays?

 

[Sebi]

You can inverting also with transistor, but the concrete solution depend from Your application. Draw or describe it what You need.

 

[john1]

You can buy reed switches with normally closed contacts in them,
or you could re-design your circuit to use normally open types.

 

[machavelli]

i need the switch to turn on a led whenever a door or window opens

 

[Sebi]

Apply this circuit...