FIELD: power supplies for sign code converters in pulse-code modulation instruments. SUBSTANCE: switching element in relay regulator is fired through coupling capacitor by comparator. This is achieved by application of saw-tooth voltage to its sign-inverting input and application of control voltage to its direct input. Control voltage is derived from switching element of current measuring unit which is inserted in current circuit. Comparator serves as pulse-width modulator which provides arbitrary small width of pulses. EFFECT: increased functional capabilities. 5 cl, 4 dwg
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