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.
We found this circuit in a documentation for radio amateurs from 1977. The circuit can be changed to...
The circuit shown, for reading perforated paper or the presence of paper, was suggested by...
This circuit was found in a NASA documentation from the 1980s. The components used are of the time...