This analog ammeter circuit was found in documentation from the 1980s. The components admit equivalents and the scales are determined by the values of the components in the range selection.
This simple neon lamp power indicator circuit was found in the January 1971 Radio Electronics...
This elementary receiver with only one germanium transistor was found in a Japanese publication from the...
This simple 1 transistor circuit was found in an American documentation from the 60's. The...