. The Bell System technical journal . ns. This section covers a transistor shunt regulatedrectifier as a substitute for the dry batteries. Its circuit is illustrated inFig. 19. The circuit in Fig. 19 is the same as Fig. 12 with the addition of thecompounding resistor and the thermistor. The compounding resistor isadded to compensate for the slope of the reference voltage diode in itssaturation voltage region (see Fig. 6). The thermistor is added to com-pensate for ambient temperature varitions of this diode and the tran-sistor. The compovniding resistor adds ac line voltage compounding. Thetra
. The Bell System technical journal . ns. This section covers a transistor shunt regulatedrectifier as a substitute for the dry batteries. Its circuit is illustrated inFig. 19. The circuit in Fig. 19 is the same as Fig. 12 with the addition of thecompounding resistor and the thermistor. The compounding resistor isadded to compensate for the slope of the reference voltage diode in itssaturation voltage region (see Fig. 6). The thermistor is added to com-pensate for ambient temperature varitions of this diode and the tran-sistor. The compovniding resistor adds ac line voltage compounding. Thetransistor base current regulating signal in Fig. 19 is increased by thecompounding resistance whenever the ac voltage is increased. By select-ing the proper ohmic value of the compounding resistor, the circuit inFig. 19 can be arranged so it will deliver constant output voltage into aconstant resistance load when the ac voltage is varied from 85 per cent TRANSFORMER RECTIFIERBRIDGE REGULATINGRESISTOR COMPOUNDINGRESISTOR ^A^v THERMISTOR. n-p-n TRANSISTOR SHUNTREGULATOR REFERENCE VOLTAGE DIODE PLUS T — REGULATED OUTPUT VOLTS ±-_ Fig. 19 — Grid-bat ten eliminator for i)lias(>-coiit rolled thyratron rectifier. 852 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1954 to 115 per cent of its normal value. In the thyratron tube rectifiers, thecircuit of Fig. 19 operates into a constant resistance load of severalmegohms. With such a high value of load resistance, the addition of thecompounding resistor on the load side of the regulating resistor does notcause appreciable error. In fact, laboratory measurements on an ex-perimental unit show that the compounding can be adjusted to obtainimproved regulation of the thyratron tube rectifier when the grid batteryeliminator is used in place of the normal grid battery. This is because thegrid battery eliminator can be adjusted to over-correct for line voltagevariations and thus compensate for the slight amount of residual lineregulation error in
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