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Last Updated on: Monday, October 09, 2017 03:38 PM

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LED (Light Emitting Diodes) Circuits   Infrared Circuits

Solar Powered Infrared 1W Security Camera Illuminator
 - June 12, 2014 -

Many security cameras are equipped with an array of infrared LEDs
to illuminate an area in front of the camera with invisible light for
night time surveillance.  However, there are times when a remote
area, well away from the camera, needs additional infrared light. 
The circuit below uses a modified solar powered path light to bathe
a fairly large area with 850nm infrared light.
The circuit uses two 3v 500ma solar panels wired in parallel to form a 3 watt solar panel producing 1 Amp of battery charging current.  The 3v from the panel charges two D size 10 Amp-hour NiMH cells wired in series.  The 2.4v from the battery is used to power a single high power 850nm infrared LED with 500ma of current.  The LEDís forward voltage at 500ma is low enough to allow such a low operating supply voltage.  A constant current 500ma drive circuit insures a consistent output level.  The LED is turned off during the daylight hours by monitoring the voltage from the solar panel.


Typical Security Camera with IR LEDs


Solar Powered Garden Light

1.2v 10AH
NiMH Battery

3W 850nm LED 3v 500ma Solar Panel

Click on Drawing Below to view PDF version of Schematic

Solar Powered 850nm LED Camera Light

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LED (Light Emitting Diodes) Circuits   Infrared Circuits

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