In this paper, a DC chopper using dual photo tube is described. The main features of this device are its non-mechanical operation, almost freely selectable chopping frequency and being applicable in the very high impedance circuits. Drift less than 0.2mV/hour, short-period fluctuation less than 10μV and DC current sensitivity of 10
-14 Amp. have been obtained easily. Some considerations for its design and applications are given.
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