Found in a manufacturer documentation from the 90s, this circuit makes use of period components. The configuration can be adapted to use modern equivalent components.
This circuit with the known PLL 567 can be found in other versions in this section and in this...
We find this circuit in the 80s used integrated circuit manual itself. The integrated circuit is not...
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...