This preamplifier for the 6 or 2-meter range was obtained from an American documentation from the 1980s. FETs can be modern equivalents and no information about the coils is given.
This circuit is part of an oscilloscope project with the PC. Its purpose is to record a peak in a...
With this circuit it is possible to control a relay up to 100 mA with an extremely low input...
This circuit amplifies VHF signals in the two-meter range and is very critical, especially...