Depending on the components, given in the table, this circuit can amplify signals of 100 MHz or 400 MHz. The circuit is from a 80's documentation. Equivalent transistor can be used.
This circuit uses a loop antenna to receive and amplify signals from the 60 kHz long wave band....
The frequency of this oscillator depends on R and C (see math section for electronics). The...
This common operational configuration can be implemented with modern equivalent. Next to the...