We found this circuit in a Japanese 1968’s documentation. The circuit makes use of transistors from that country common at the time of publication. Observe the symmetrical power supply for the circuit.
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...