This notch filter was found in National Semiconductor documentation from the 1980s. Operational amplifiers are from that era. The configuration can be adapted to use modern operational amplifiers.
This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V...
This circuit is from 1967 General Electric documentation. It uses SUS which are not very common...
August 2017 - MCUs of the new Infineon MC1400 series for industrial use can now be purchased from...