This transformerless circuit was obtained in a 1965 publication by Ferranti. The components are from that time, with emphasis on the type of engine used.
Using a standard multimeter, this circuit from a 73 magazine for radio amateurs provides an output...
This capacitive switch or approximation relay was found in a 1980s US publication. Power should...
This circuit uses a 6-bit A / D converter from Philips, and has its output compatible with most...