This isolation circuit for audio signals was found in the August 1992 issue of Radio Electronics magazine. The circuit can be applied to other operational amplifiers.
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...