Abstract
A simple means for combining a small direct voltage with an alternating carrier is described. This consists of connecting the direct voltage in series with an alternating voltage of the same order of magnitude. The two are then passed through a copper oxide rectifier which suppresses one part of the cycle. The degree of suppression depends upon the magnitude of the direct voltage. The resulting fluctuating voltage can be amplified to any desired degree in a conventional amplifier. The theory for the simple case of pure resistance is worked out, with an example. The solution of the more general case with inductances is indicated. The practical circuit which has been used for the amplification of thermo-couple currents, and as a galvanometer power multiplier, is shown.
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