Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Check that the timing IC works.
You may have to swap the capacitor C1.
It looks like that the timing oscillator doesn't start hence the continuous alarm.
I don't think the piezo buzzer will reliably work of such a low voltage. It might work with new 3V batteries but once the batteries have discharged to about 2.4V the piezo will only get 1.8V as it's being powered from an emitter follower.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
