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.
This is a typical amplifier circuit for a commercial tape recorder from 1968. The circuit has an...
This circuit functions as a variable capacitor controlled by a potentiometer, multiplying the...
This differentiator for the positive front of the input signal can be elaborated based on any...