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.
This circuit, very critical due to the frequency at which it operates, was found in an American...
Found in 90’s English documentation, this rising and falling siren, manually activated, drives a...
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...