Author Options:

Laser Alarm System Answered

Hello guys,

I need some help building a circuit. I'm new to electronics, so go easy with me.
Is there a way to build and laser alarm circuit but instead of the alarm going on just when the beam is broken the alarm stays on until I turn it off? Circuits like Kipkay's only go off when the beam is broken. How can I make the alarm stay on once the beam is broken?


2 Replies

quatch (author)2012-11-04

monostable 555 timer circuit, internet will help you with it, and it is easy!

Select as Best AnswerUndo Best Answer

HavocRC (author)quatch2012-11-04

Thank you quatch!

If you have a link to a good website that would be fantastic!


Select as Best AnswerUndo Best Answer