This amplifier with the EL84 tube is a European commercial type from Corpim mounted on a printed circuit board. The diagram appeared in a September 1958 Radio Electronics magazine.
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...