This 80's circuit can be implemented with modern equivalent FETs with lower on resistance. The attenuation is 80 dB at 100MHz.
Found in a 1970 American publication, this circuit uses transistors of the time. These transistors...
When this alarm is off current drained is very low, only about 60 µA. The circuit can be powered...
We found this circuit in the October 1990 issue of Radio Electronics magazine. The frequency can...