This circuit, with printed circuit board included, is from a Radio Electronics magazine from July 1971. The SCR can be any equivalent of the 106 series.
Another application circuit for the NE567 is shown in the figure. It consists of a decoder for...
In fact, this is the circuit also known as “vox”, that is, a relay triggered by sound. This...
This circuit can be used with transmitters in the 3 to 30 MHz frequency range also functioning as a...