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Circuits
designed by David Johnson, P.E.
Last Updated on:
Monday, December 25, 2017 02:09 PM
Master Category List - Dave's Circuits
Text & Graphics Copyright © David
A. Johnson, PE - ALL Rights Reserved.
LINKING to Dave's circuits is permitted but DO NOT COPY to ANY WEB SITE server! |
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More
Camera
Circuits
LED (Light Emitting
Diodes) Circuits
Infrared
Circuits |
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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. |
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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 LED’s 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. |
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Typical
Security Camera with IR LEDs
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Click on
Drawing Below to view PDF version of Schematic |
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