We found this passive circuit in the February 1995 Electronics Now magazine. The circuit is passive, presenting only attenuation that must be compensated by an amplification stage.
This circuit activates a machine to dry hands (fan and heater) when the sensor detects the...
The operational used is like the 741. The circuit is from the datasheet and the formula that...
The second order filter shown in the figure is suggested by Texas Instruments, based on the TL081...