Found in American documentation from the 90's, this circuit can be implemented with modern equivalent components. Observe the symmetrical power supply.
The Triac trigger integrated circuit is not very common nowadays. The circuit was found in the...
This 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...
We found this circuit in the January 1994 Electronics Now magazine. It uses general-purpose...