POWER SOURCE CIRCUIT

PURPOSE:To prevent an increase of a heat loss at a regular time, and also to raise the stability of a power source at the time of a large output, by detecting a voice output, and decreasing a reference voltage of a constant- voltage circuit in accordance with said detection. CONSTITUTION:A voice out...

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Bibliographic Details
Main Author YASUNO JUNICHI
Format Patent
LanguageEnglish
Published 16.06.1987
Subjects
CONTROLLING
PHYSICS
REGULATING
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Summary:PURPOSE:To prevent an increase of a heat loss at a regular time, and also to raise the stability of a power source at the time of a large output, by detecting a voice output, and decreasing a reference voltage of a constant- voltage circuit in accordance with said detection. CONSTITUTION:A voice output is provided to input terminals 31, 32 of a loudspeaker output detecting circuit 3. In this state, when the voice output increases, and a transistor (TR) 304 of the detecting circuit 3 is turned on, a TR 202 of a reference voltage switching circuit 2 is turned on. As a result, a low voltage Zener diode 203 works on a constant-voltage power source circuit 1, and its reference voltage is switched to a low voltage. Accordingly, an output of a constant-voltage power source at the time of a large output is stabilized. Also, in case of a state of the regular use, the reference voltage is switched to a high voltage, therefore, an increase of a heat loss can be prevented.
Bibliography:Application Number: JP19850273724