Found in a 90’s HAM Radio, this circuit is used for an optical communications system or even audio transmission by optical fiber. The components are common.
This circuit generates a pulse of duration determined by the capacitor when an object interrupts the...
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...
This wideband circuit with the 4046 PLL was found in the December 1989 Radio Electronics magazine. The...