Found in the February 1990 Radio Electronics issue, this sophisticated 100 MHz probe uses a period display module. The circuit has an external power supply.
Found in a 90s Popular Electronics, this circuit uses a MAR-X to amplify signals up to 2 GHz. The...
This circuit is from an old French documentation from the 70s. The coupler admits equivalents and...
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...