SUS (Silicon Unilateral Switches) with a 8 V trigger voltage used in the controlo f SCRs and other applications.
This 1969 Philips documentation circuit makes it possible to control an engine through the sound...
We found this circuit in a 90's Radio Electronics. The circuit can still be easily assembled as all...
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...