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Circuits designed by David Johnson, P.E.
Last Updated on:
Monday, December 25, 2017 02:09 PM
List of Dave's Circuit Designs
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Solar Circuits
Solar Path Light Improvements Circuit
designed by David Johnson, P.E.
March 13, 2011
Use
the circuit below was designed to replace the guts of an existing path light assembly
with one which has a much better performance. I suggest using a quality 10 cell
solar panel with at least a 4 square inch area. Buy a panel with solar panels that
fills nearly the whole panel area with solar cells.
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The circuit uses an ideal diode and voltage regulator to charge either
a lithium ion or a 3 cell NiMH
battery. The circuit drives a quality LED with
20ma of constant current and measures the voltage across the solar panel to know when
to turn off the LED during daylight hours. I strongly recommend using a quality
white LED from Cree or some other reputable source. |
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5v 100ma Solar Panel |
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Text & Graphics Copyright © of David A.
Johnson, P. E. -- ALL rights reserved, NO EXCEPTIONS! |
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