This is the receiver for the previous circuit we found in the December 1992 Radio Electronics magazine. The sensor is a photodiode that must have optical features such as lenses.
The great advantage of the circuit shown in the figure is the fact that its frequency is...
Found in American documentation from 1969, this circuit produces a pulsating waveform being...
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...