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Pulsating direct current
In telecommunication, a pulsating direct current is a direct current (dc) that changes in value at regular or irregular intervals.
Note: A pulsating direct current may change in value, i.e., be always present but at different levels, or it may be a current that is interrupted completely at regular or irregular intervals, but when present, is always in the same direction.
Source: from Federal Standard 1037C
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