We found this circuit in a 1967’s Electronics World. The circuit can be made with modern equivalent transistors. The selection is made by the tuned coil.
This power supply can provide 10 A currents. Its regulation is made by 7812 integrated circuit. The...
This circuit is suggested by a 1965 General Electric documentation. The triac must be in...
This circuit is from a documentation for amateurs from 1978. The circuit both analyzes logical...