Magnetic Sensor

Brightness Control Relay Circuit

Published:2011/5/4 21:48:00 Author:chopper | Keyword: Brightness Control, Relay

As shown in figure is a brightness control relay circuit.Resistance R1, R2 and photoresistance R3 form a divider circuit.When the light isdark to a certain degree,base voltage of VT1 increases,making the VT1 and VT2 connected,and relay J merged.R1 is used for sensibility control.The light-triggered pedestal of this circuit is influenced greatly by voltage and ambient temperature.   (View)

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Simple Light-operated Switch Circuit

Published:2011/5/4 4:02:00 Author:chopper | Keyword: Light-operated Switch

As shown in thefigure is a simple light-operated switch circuit.In some public places,it is convenient as well as power-saving whenapplied to,such as,passageway、street lamp...It starts automatically in the dark;and closes in the daytime.It is applicable to different types of photoresistance and opens under certain conditions(degree of darkness) by regulating 4.7 M Ω potentiometer.   (View)

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Bridge Photo-detectors of photoresistance Circuit

Published:2011/5/3 23:51:00 Author:chopper | Keyword: photoresistance, Bridge, Photo-detectors

As shown in figure ,photoconductive resistance can form a bridge photo-detector in the industry photoelectric measuring device.Two of the same model (dark resistance equal) photoconductive resistanceact asbridge arms.One of them is used as photo-detectors;another sealed by black tape to avoid light as temperature compensation.This kind of Bridge Photo-detectors can use either dc or ac .When adopting ac modulation, it outputs for ac signal,which can reducenull shift of amplifier.   (View)

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valuables pilfering tracker circuit diagram 2

Published:2011/4/15 2:28:00 Author:Rebekka | Keyword: valuables pilfering tracker

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