Instructables

Laser Alarm System

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?

Thanks



quatch2 years ago
monostable 555 timer circuit, internet will help you with it, and it is easy!
FoamboardRC (author)  quatch2 years ago
Thank you quatch!

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

Thanks,