This circuit was found in Radio Electronics from the 90s. Q3 must have a heatsink and R10 fixes the output voltage.
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...