The cut-off frequency of the circuit shown in the figure is 750 Hz, with the components used. The circuit applies to almost any operational amplifier and the power supply must be symmetrical.
This circuit was obtained in European documentation from the 1980s. Transistors support...
This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is...
This Salen-Key filter can use any operational amplifier and other frequencies can be obtained by...