JPS57143911A - Variable resistance circuit - Google Patents

Variable resistance circuit

Info

Publication number
JPS57143911A
JPS57143911A JP2925181A JP2925181A JPS57143911A JP S57143911 A JPS57143911 A JP S57143911A JP 2925181 A JP2925181 A JP 2925181A JP 2925181 A JP2925181 A JP 2925181A JP S57143911 A JPS57143911 A JP S57143911A
Authority
JP
Japan
Prior art keywords
circuit
light
processor
resistance value
resistance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2925181A
Other languages
Japanese (ja)
Inventor
Kosuke Nishimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP2925181A priority Critical patent/JPS57143911A/en
Publication of JPS57143911A publication Critical patent/JPS57143911A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators
    • H03H7/27—Frequency- independent attenuators comprising a photo-electric element

Abstract

PURPOSE:To obtain a variable resistance circuit of simple constitution, by using a light emitting element, whose quantity of emitted light varies with an electric signal, and a photodetecting element, having a resistance value variable with the intensity of photodetected light, in combination for remote control over the sound volume of, e.g. a TV receiver. CONSTITUTION:Through the manual operation of the operating circuit 4 of a remote operating device 3, a control signal generating circuit 5 emits a signal of light, an ultrasonic wave, etc., to the control signal receiving circuit 6 of a TV receiver 1. The signal received by the circuit 6 is supplied to a processor 7. An acoustic signal generating circuit 8 is controlled by the processor 7 and its output is supplied to a cadmium sulfide element 12 as the photodetecting element of a variable resistance circuit 11. The processor 7 decodes the control signal of the device 3 to energize the light emitting diode 18 of the circuit at a duty ratio which corresponds to sound volume. As the intensity of photodetected light increases, the resistance value of the element 12 decreases and the resistance value of a resistance 13 is so set than when the diode 18 is turned off, a sound from a speaker 2 is small enough not to hear.
JP2925181A 1981-02-27 1981-02-27 Variable resistance circuit Pending JPS57143911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2925181A JPS57143911A (en) 1981-02-27 1981-02-27 Variable resistance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2925181A JPS57143911A (en) 1981-02-27 1981-02-27 Variable resistance circuit

Publications (1)

Publication Number Publication Date
JPS57143911A true JPS57143911A (en) 1982-09-06

Family

ID=12271045

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2925181A Pending JPS57143911A (en) 1981-02-27 1981-02-27 Variable resistance circuit

Country Status (1)

Country Link
JP (1) JPS57143911A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988002198A1 (en) * 1986-09-16 1988-03-24 Thomas Michael Kenny Retrofit remote control apparatus
JP2006229440A (en) * 2005-02-16 2006-08-31 Audio Technica Corp Microphone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988002198A1 (en) * 1986-09-16 1988-03-24 Thomas Michael Kenny Retrofit remote control apparatus
JP2006229440A (en) * 2005-02-16 2006-08-31 Audio Technica Corp Microphone
JP4508900B2 (en) * 2005-02-16 2010-07-21 株式会社オーディオテクニカ Microphone

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