This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974. Transistors are common types at the time.
This circuit is from a cookbook to timers. The circuit is triggered by an external signal and,...
The project presented consists of a flasher alternated with relay, which can be installed at the...
This circuit was obtained from a Hands-On Electronics, an American magazine from January 1987. The...