Based on CMOS logic gates, this circuit was found in an Electronic Design from the 90s. The circuit is for voltages from 11 to 15V, but it can be changed,
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...
This circuit was found in a 1967 Electronics World. We can design it with a BF245 for the FET and a...
Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power...