We found this circuit in an article in Radio Electronics magazine from November 1971. The circuit has several sensor inputs and is based on programmable unijunction transistors or PUTs.
Found in a Philips documentation from 1968, this circuit detects the trimpot set input voltage....
This circuit is from a 1966 American documentation. The circuit uses a photo-FET, an unusual...
This is a typical application circuit of a 565 PLL. The circuit is suitable for selecting a 67 kHz...