Solar Powered Lighthouse - While at a discount store one day, I spotted an interesting tall lighthouse. Hobby Circuit by David Johnson P.E.-July 14, 2017 The strip had 5 strings of three LEDs, wired in series, with a 150 ohm current limiting resistor. But later, I installed a series of five 12v LED light strips on the ceiling. There were times when I needed to get something from inside the shed during the dead of night.
Leds radio shack battery charger full#
It is full of lawn chemicals and garden supplies. Solar-Powered_LED_Light_for_Tool_Shed - I have a lean-to 8ft by 12ft shed next to my house. Circuit by Dave Johnson P.E.-January 02, 2011 The circuit uses a Reg113-5 voltage regulator from Texas instruments.
Leds radio shack battery charger portable#
That voltage can be fed to any cell phone or USB connected portable device, to charge its battery. Solar Powered Cell Phone Charger - The simple circuit below regulates the voltage from a 6v solar panel to a fixed +5v. I suggest using a quality 10 cell solar panel with at least a 4 square inch area. Solar Path Light Improvement - Use the circuit below was designed to replace the guts of an existing path light assembly with one which has a much better performance. Circuit by David Johnson P.E.-December 24, 2012 These batteries like to be charged from a fixed 4.2v source with a charging current limited to about C/8, where C is the milliamp-hour rating of the part. Many of them use just a single 3.6v lithium ion battery. Solar Lithium Ion Battery Charger using LT1129 - I have been designing a number of solar powered devices lately. Circuit by David Johnson P.E.-September 21, 2017 Later, I would let them out to live another day. I loved watching them flashing away at night. Solar Fireflies In Jar Light - When I was a kid, growing up in Illinois, I remember catching fireflies and putting them into a jar. Circuit by David Johnson P.E.-May 23, 2017 Some are wired for 12v operation while other COB LEDs in flashlights are all wired in parallel, with an operating voltage of about 3 volts. The multiple LED chips can be wired into any number of series/parallel configurations. The metal back allows the assembly to be mounted to heat sink to keep the device cool. These devices assemble multiple tiny LED chips onto a metal backed circuit board, then cover the assembly with a plastic cover. Solar 1w Cob LED Light - Chip on board (COB) LEDs are all the rage.
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