This 1924 receiver uses a battery for the tube filaments and a high voltage battery for the amplifier and detector circuit. The speaker is kind of high impedance era.
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...