This circuit was found in an Electronic World of 1968. The circuit uses power transistors of the time. The transistors are for 25 W of dissipation.
We found this circuit on a Radio Electronics. Similar configurations can be found in this section. The...
This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
This circuit is from General Electric from the 80s, using a relay with high current contacts (20...