This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
This zero-crossing detector circuit produces an output pulse every time the input sinusoidal...
This circuit for the 3.5 MHz band (80 meters) was found in an old radio amateur documentation. The circuit...
This circuit was found in a 1980s documentation. Similar configurations appear in the section, but from...