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.
This power supply was described in an article in Radio Electronics magazine from July 1968. The...
The integrated circuit used in this 80's application is not common today, but the design serves as...
Some delicate sensors such as reed-switches and even sensors made with small metal plates do not...