Found in a Westinghouse Silicon Power Handbook from the 60s, this circuit makes use of period components. Special high voltage transistors are used. Zeners are 15 V.
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...