This circuit was found in a 1980s documentation, using a comparator from the time. The configuration can also be implemented with comparators or modern operational.
This oscillator with FET was found in Popular Electronics from the 90s. This traditional...
This low-power circuit was found in the March 1990 issue of Radio Electronics magazine. It...
This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V...