Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1981-03-27
1983-05-17
Grimm, Siegfried H.
Oscillators
With device responsive to external physical condition
Temperature or light responsive
331113R, 340584, 340598, 374145, 374178, G01K 700, H03K 3282
Patent
active
043842623
ABSTRACT:
In an oscillator circuit responsive to a predetermined temperature and including an astable multivibrator, a switching transistor inverts an output voltage from a first transistor of the multivibrator with a predetermined time delay, and a feedback capacitor is responsive to the inverted output voltage from the switching transistor to bias a reference capacitor connected between the output terminal of the first transistor and the input terminal of a second transistor of the multivibrator at opposite voltage polarity relative to that of a terminal voltage across the reference capacitor, a capacitance of the feedback capacitor being determined to turn off the second transistor due to the bias of the feedback capacitor when ambient temperature becomes the predetermined one under exposure of the second transistor to the ambient temperature.
REFERENCES:
patent: 2984729 (1961-05-01), Hykes et al.
patent: 4184126 (1980-01-01), Jaskolski et al.
Akita Sigeyuki
Tanaka Hiroaki
Grimm Siegfried H.
Nippon Soken Inc.
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