This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio Electronics magazine. The circuit is based on an LM324 and a sensor from that time.
The values of the indicated components in this circuit of a 1967 Electronics World, are for a...
Found in a 1969 documentation, this neon lamp circuit may have the number of steps increased. The power...
The voltage gain of this circuit is 1,000. This gain is given by the ratio between the 10 M ohm...