The circuit of IR burglar alarm system comprises transmitter and receiver-cum-alarm sections. It works off 6V DC, 500mA uninterrupted supply and uses low-cost readily-available electronic components.

For more information on how to keep your home safe, read our list for the best home security systems. A burglar alarm, also known as a security alarm, is a simple electric circuit that is designed to ...

Learn to recognise different circuit symbols with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.