This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The attenuation is 80 dB at 100MHz.
Two of the four gates of a 4011 is used in this biestable touch circuit. Do not use a power source...
We found this circuit in an integrated circuit cookbook from 1974. The circuit can provide larger...
This circuit was found in an American 1980s documentation. The transistorized step is the...