We found this circuit in a documentation from the 70s. Semiconductors are from the era and can be replaced by modern equivalents.
This circuit was originally found in a Philips documentation from 1969. It is intended for sensing...
This small source was found in an English documentation from 1970. The diodes can be 1N4002 for...
The oscillator shown generates a rectangular output signal at a frequency of 5 MHz, determined by the...