This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The attenuation is 80 dB at 100MHz.
This circuit was found in an American 1980s documentation. The integrated circuit used is uncommon...
The sensor for this circuit is a phototransistor. We found it in the April 1971 issue of Radio...
We found this circuit in an old Signetics documentation. The integrated circuit is of the time,...