This circuit mimics the trill of a bird. We found it in an American documentation from the 90s. It is based on the LM3909 integrated circuits.
Raytheon's used integrated circuit is uncommon today. However, the configuration is an example and can be...
This circuit was found in the September 1972 issue of Radio Electronics magazine. The circuit uses...
This circuit aims to use a low current reed-switch, switch or sensor to control a high current load....