We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The transistors were common at the time and the transformer was from a transistor radio output.
This basic oscillator with tunnel diode generates a 100 kHz signal with 1 uW output power. The...
This windshield wiper interval switch was found in the April 1990 issue of Radio Electronics...
This circuit is from General Electric from the 80s, using a relay with high current contacts (20...