This TTL circuit was found in an American documentation from the 80s. The components are common in the series and the supply must be made with a voltage of 5 V.
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...