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, from a 1977 publication, allows to know if a bipolar transistor of general use is...
We found this circuit in a 1965 Electronic Design. The transistors are from the era, and modern...
This indicator with the integrated circuits CA3162E and 3161E was published in the July 1990 issue...