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 from the LM317's own manual obtained from an old documentation. The IC should be...
This circuit should be placed between a turntable and recorder or playback media from the input to...
This simple 10-position roulette circuit with the 4017 found a 1987 documentation. The circuit can...