This interesting circuit in which the LED display is circular imitating a common clock appeared in the Radio Electronics magazine of May 1977. The power supply is included.
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...