Door Alarm (CB6489E)

We found this circuit in a Popular Electronics of the 90s. The circuit can also be used as a seat belt alarm. The components used are common.

Boltrack Connectors - Amphenol FCi
Mouser Electronics has in stock Amphenol FCI Booltrack ™ connectors for robust connectivity...
High Power Sound and Ultrasonic Generator (CB1563E)
In the figure we show an application in which the 4093 excites a stage with 4 transistors in the...
Siren (CB4181E)
This siren was found in a 1980s documentation. The circuit makes use of very old operational that were...