We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can be a TIC106. The reset is done by a push button.
This circuit switches the brightness of the LED. We found it in an English documentation....
The circuit shown in the figure triggers a relay when S1 is pressed, but this only in the absence of...
This astable multivibrator is one of the many configurations that we have in this section and on...