Re: Light sensor circuit 0-5 volt output help required

["Frank Mc Alinden" <frankmc@xxxxxxxxxxxxxxxx>]

Hi Jason

Maybe you can  use the circuit in the link....with some small mods..

http://science.uniserve.edu.au/school/Seismograph/detector/index.html

HTH
Frank

----- Original Message -----
From: "ukhauk" <jasonstarkie@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Monday, April 10, 2006 6:58 PM
Subject: [ukha_d] Light sensor circuit 0-5 volt output help required


>I am trying to construct a light sensor circuit with an analogue
> output 0-5 Volt DC. Supply voltage around 12 volts
>
> I have been trying to adapt maplins MK125 Light Sensitive Switch
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> http://www.maplin.co.uk
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> The MK125 uses an op amp to compare a setpoint voltage with the
> voltage across a light sensor. Can I limit the output voltage on the
> op amp using feedback ?
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> Or am I on the wrong track, has anyone come across such a circuit.
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> I want to use the sensor as a Dusk to dawn sensor ideal for example
> on a web brick / barionet. Having an analogue signal would allow
> different actions dependant on various levels.
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> any help or suggestions appreciated I have spent days on google
> without succsess.
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> Yahoo! Groups Links
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