This circuit is from a Mallory 1968’s documentation. The integrated circuit is of the time and the transistor admits equivalents.
This oscillator for frequencies up to a few tens of kilohertz was found in a 1970s documentation. The...
We found this circuit in Radio Electronics magazine. It triggers a load (relay) by the noise from...
This circuit is from a 1977 publication and is characterized by an adjustment of the polarization point of...