Alarm with relay (CB21218E)

This latching alarm circuit using relays was found in American documentation. Sensors are connected in parallel.

Driving the 4017 (CB16095E)
The integrated 4017, a C-MOS counter, is one of the most popular in the design of sequences,...
Infrared tone transmitter (CB20977E)
This simple very low power circuit can be used in a battery powered infrared tone trigger. We...
Dual Time Timer (CB10005E)
This timer controls two relays, each with a different timing, activated separately. The circuit is from...