We found this circuit in a 1964 Electronic Design. Transistors can be modern general-purpose equivalents. The circuit converts a 1 MHz sinusoidal signal into a rectangular signal.
This circuit appears elsewhere on this site. The CMOS gate can be any one, including NAND and NOR...
The circuit of the figure consists of a motor timer that can delay drives for up to 15 minutes....
The transmitter shown can reach around 100 meters depending on the location and sensitivity of the...