With this circuit found in a 1965 Electronic Design, it is possible to read a peak voltage of up to 250 MHz signals.
The power supply shown can supply voltages of approximately 0 V to 12 V with a maximum current of 4.5 A,...
This indicator was found in a 1974 publication, but it can be fitted with the BC548 transistor or...
Used with infrared remotes at the time, this circuit was found in a 1991 RE Experimenter Handbook....