Title:
VARIABLE RESISTOR
Document Type and Number:
Japanese Patent JPS5660074
Kind Code:
A
Abstract:
PURPOSE:To obtain the variable resistor which is not affected by temperature and is insulated at the input and output by negative feeding back the output of the first photodetecting element to an amplifier to which an integrating voltage for irradiating a photo coupler having one light emitting element and first and second photodetecting elements is inputted. CONSTITUTION:When the switching contact (a) of a switch S1 is shifted to a contact (d), a light emitting diode LED irradiates a light, the first phototransistor PT1 is turned on so that the potential at the point (d) becomes 0 volt and the impedances of the phototransistors PT1, PT2 become zero ohm. When the switch S1 is shifted to the contact (c), the integrating circuit of a resistor R1, a capacitor C and an operational amplifier 1 integrates the voltage -V of the power source, the potential at the contact (c) is raised, and the potential when the switch S1 is opened is held. Since the potential at the contact (c) of the operational amplifier 2 is equal to the potential of the contact (d), the impedances of the transistors PT1, PT2 become Vc/I, where the potential of the contact (c) is represented by Vc and the current of the constant-current source 4 is represented by I.
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Inventors:
YAMAUCHI YOSHITOSHI
Application Number:
JP13550179A
Publication Date:
May 23, 1981
Filing Date:
October 20, 1979
Export Citation:
Assignee:
RICOH KK
International Classes:
H01C10/00; H01L31/12; H01L31/16; (IPC1-7): H01C10/00; H01L31/12
Domestic Patent References:
| JPS5294089A | 1977-08-08 | |||
| JPS52141585A | 1977-11-25 |
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