This audio level indicator was found in October 1980 Radio Electronics magazine. See the table with the dB values of the indicated signals.
Depending on the components, given in the table, this circuit can amplify signals of 100 MHz or...
Found in Ferranti's 1969 documentation this circuit has a maximum operating frequency of 7.5 MHz....
An interesting interface solution that can be provided in some cases is the one shown in the...