| 摘要 |
A stabilizing circuit for the operating voltage of a microcomputer, in which the input of the circuit is connected to a power supply, and the output of the circuit is connected to the operating voltage-input of the microcomputer. Connected in parallel with the operating voltage-input is a first zener diode, and connected in series with the latter is the collector-emitter section of a first transistor, in which this series circuit is arranged in parallel with the circuit input; wherein there is provided a circuit portion which will deliver a base current to the first transistor for connecting-through of the transistor only then, when subsequent to the switching-in of the power supply, a voltage has built up at the circuit input which, in comparison with the voltage rise of the power supply, leads to a rapid rise in the operating voltage; and in which the emitter-collector current of the first transistor is a constant current which divides itself between the microcomputer and the first zener diode, whereby the first zener diode presently conducts that portion of the constant current which is not employed by the microcomputer in conformance with its current load condition.
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