We found this solid-state relay circuit that can function as a shield in a Radio Electronics magazine from December 1989. The optocoupler is a phototransistor type.
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...
This circuit was found in a 1970s American documentation. It can be applied to almost any...
This simple oscillator with two general-purpose transistors has its frequency given by capacitor...