These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.
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...