This circuit generates damped sounds imitating a drum or other percussion instrument with alteration of the double T components. We find it in an old American documentation.
T This circuit produces an audible signal when someone touches the sensor, or even approaches. The...
This circuit for tuning FM receivers was found in the November 1960 Radio Electronics magazine. The...
This configuration for switching signals uses only common general-purpose diodes such as 1N4148. The...