. The Bell System technical journal . Fig. 31—Laboratory model of encoder-transistor-register using transistorpackages. 440 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1952. Fig. 32—Packaged oscillator and amplifier using junction transistors. only the available undistorted power output increasing as the voltage isincreased. At a collector voltage of volts it draws a collector currentof approximately ma per unit for a total power drain of milli-watts. Under these conditions it will deliver Class A power output ofabout milliwatt. The noise figure of such an amplifier has beenmeasured
. The Bell System technical journal . Fig. 31—Laboratory model of encoder-transistor-register using transistorpackages. 440 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1952. Fig. 32—Packaged oscillator and amplifier using junction transistors. only the available undistorted power output increasing as the voltage isincreased. At a collector voltage of volts it draws a collector currentof approximately ma per unit for a total power drain of milli-watts. Under these conditions it will deliver Class A power output ofabout milliwatt. The noise figure of such an amplifier has beenmeasured to be in the range from 10-15 db at 1000 cps depending uponthe operating biases. To the left of Fig. 32 is shown a small transistor audio oscillator havinga single M1752 transistor, a transformer and one condenser. To see justhow little power was the minimum necessary to produce stable oscilla-tions such an oscillator was tried at increasingly lower collector supplyvoltages. It was found that stable oscillations could be maintained downto collector supply voltages as low as 55 millivolts and collector currentas low as microamperes for a total drain of
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