Magnetic door sensor to turn on led light problem

[Darkwood]

going to use a 4011 cmos logic chip 4 inputs / 4 outputs 40p job ....total £1 plus relays

I see you gone for the bee's knees then as oppose to cost effective

 

[tazz]

Drawn the circuit up for you, note that a/b/c are all one 14 pin 4001 (yes changed my mind) The circuit draws only 1 micro Amp in standby, and thus through the contacts. It is the basis of most security alarms. When the mag reed is closed all is ok, open the switch and the led and relay are activated, close the switch and the are de activated. simples, hope this helps

View attachment CCTV Alarm input.pdf

 

[Mike Blair]

Thanks tazz! Il be doing this soon as i get the parts thanks!!