JPS57143911A - Variable resistance circuit - Google Patents
Variable resistance circuitInfo
- 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
Links
- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 abstract 1
- 229910052980 cadmium sulfide Inorganic materials 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
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
Landscapes
- Attenuators (AREA)
- Control Of Amplification And Gain Control (AREA)
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.
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)
| 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 |
-
1981
- 1981-02-27 JP JP2925181A patent/JPS57143911A/en active Pending
Cited By (3)
| 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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