This filter is from a 1977 publication. The circuit employs three 741 or other operational amplifiers. The supply must be symmetrical and the components with (*) are low tolerance.
June 2017 - Mouser Electronics already has the new Vishay DG series analog switches in stock. The...
This circuit was found in a computer publication from the 1970s. The transistors can be the BD135...
The circuit is from old documentation but can be implemented with any modern power MOSFET. The...