This circuit provides a delay for the activation of an alarm, giving the owner time to leave the premises. The circuit is from the 1995 Encyclopedia of Electronic Circuits Volume 5.
This two-transistor constant current source is from a 1968 documentation. Modern equivalent...
We found this circuit in an old documentation. The integrated circuits used are specific to...
This circuit was found in a 1964 Electronic Design. The circuit can be implemented with equivalent...