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 circuit can be used in physics experiments, in ionization and in several other applications. The...
Through digital control, this circuit activates the input filters that have the frequencies...
This VCO or Voltage Controlled Oscillator uses common components. The circuit generates signals that...