Saturday, November 12, 2016

Solar Joule Thief Night Light

1.2V Solar Table Night Light

- Ideal for use as emergency lights instead of kerosene lamps and candles- Can also be used as table night lamp
- Powered by just (1) one AA Ni-MH rechargeable battery

- Charging by 5V 1 to 2 W solar panel during daylight

- Auto 1W LED lights up at night

ses QX5252F IC with light sensing which turns on the LED when its dark and turn off when its bright and an overdischarge protection for the battery (cuts off the load @ 0.9V)

Parts Lists:

 (1) QX5252F IC

 (1) 33uH inductor
 (1) 0.22uF ceramic capacitor
 (1) 1N4148 diode.

Schematic Diagram:

Featured at the following events:

Lumiare London

MASDAR Institute UAE

Solar Night Lights using 18650 battery

Uses just 2 electronics parts: IC and a resistor

- IC has auto on/off feature typical of solar garden lamps
- Also has built in protection against battery overcharge and over discharge.

Various projects using this simple circuit:

Quick DIY solar cooling hat

Materials Used:

6V 1W solar panel
5V USB flexible fan
USB extension cord
cable ties, post screw

Uses post screw for attaching solar panel on to the hat:

Wednesday, December 3, 2014

MOT rewound for battery charger

Used to be a DIY spot welder, then I finally decided to use the MOT for my DIY battery charger. 13 - 17 turns of # 12THHN wire to make an output voltage of 14.5VAC.

Battery Charger automatic cut-off circuit