This circuit activates a buzzer when the voltage applied to the input falls below a preset value in R1. The circuit is from an 80's American documentation.
This circuit was found in a Radio Electrnics of the 90s. The SCR can be any of the 106 series...
This instrument was found in a publication for radio amateurs in 1973. The tuned circuit consists of...
May 2016 - It can be obtained from Mouser Electronics new connectors Ultra-Fit ™ series from Nikex for...