This circuit is from the 1989 special edition of Radio Electronics Experimenter. The circuit was created with SMD components to be mounted on a keychain.
The presented circuit can be implemented with a BC548 and for larger currents a BD135 can be used....
This circuit works directly connected to the network and special care must be taken with its...
Suitable for dual applications, this timer was found in a 90s Popular Electronics. The circuit...