Grounding test (CB10092E)

This simple circuit for a common 110 V power grid was found in a 1980s American documentation. The circuit uses neon lamps as indicators.

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DC Volume Control (CB19296E)
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Wide Range VCO 4046 (CB19077E)
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Headphone Control Center (CB16383E)
This is the project we have described, as found in a 1981 documentation. In the figure we show the...