This oscillator produces a modulated signal using a unijunction transistor. We found it in an American documentation from 1965. The circuit modulates in frequency the generated signal.
In this circuit the regulation is made from a circuit in the LED cathode. The configuration is...
Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next...
This test for electrolytic capacitors was found in the October 1960 Radio Electronics magazine. Note...