This circuit was found in a publication by Edelman from 1924. The power comes from the battery and the listening is through a high-impedance headphone.
What this circuit does is to separate a monophonic audio signal into two frequency bands so that,...
The circuit shown in figure uses a photodiode as a sensor element and its main feature is to have...
By pressing and releasing S1 the relay closes its contacts for a time that depends on the value of the...