This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas for component calculation are given next to the diagram. Any operational amplifier can be used. The font must be symmetrical.
![](/images/stories/cir/221612162023_144516_0001.gif)
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas for component calculation are given next to the diagram. Any operational amplifier can be used. The font must be symmetrical.