We found this sophisticated meter circuit in an article in Radio Electronics magazine from June 1959. The article taught how to assemble it. Transistors are common types at the time.
This keypad telephone encoder circuit was found in ancient American documentation. The components used...
This 80 W transistor amplifier was found in a 1985 documentation. The 70 V source must have at...
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...