Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power supply must be symmetrical.
Figure bellow shows how the 4510 can be cascaded for counts higher than 10. The circuit shows the...
This circuit was found in an American 1980s documentation. It makes use of an unusual MOSFET today...
We found this third-order Butterworth asymmetric filter in an old manufacturer documentation. The...