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 automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a...
The slope of an object causes the sensor, a mercury switch to be triggered. The circuit activates...
The assembly of this circuit was described in an article in the magazine Radio Electronics of June...