This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high voltage transistors and the relay is high voltage as well.
This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog...
This TTL oscillator was found at Popular Electronics in 1992. It provides both sinusoidal and...
This circuit was obtained from an American publication from the 60's. The transistors are...