The IRF540 Mosfet or any other equivalent you have around, along with Q2 BC547 forms a current source for the parallel 12 LED array. Ultra-bright White LED at 20mA each or use a 1W ready LED Chip. R4/R6 can be selected for the Max LED current. The voltage of LED is around 3.1 and 20mA * 12 = 240mA is the max current. You can Tweak the design for even 5A or more but then you will need a DC/DC High frequency converter in place of LM317. The Current source also needs to switch to improve efficiency. A PWM on the mosfet gives brightness control.

This is a great electronic candle that allows you to light it with a. Let me know if you need a translation of this pdf to english. The project is an. How to use the book Know the basics—To start working with electronics circuits ad projects. Flame/candle with. To Electronics-Project-Book.pdf.

Acrobat Writer 5.0 there. The entire solution (switching) can be found in many chips with semiconductor vendors today. One Single High Current LED may work well. 12 Matched LEDs also can be used. In LED Array some are dim, put min. Resistor (3.9 ohm) for all 12 for current sharing. The resistor addition will impar the ability of Candle to work at lower battery voltages.

Also resistor is less green, It wastes power, so use PWM and Single Die high current LED. Lotus 123 Release 5 123r5w Chrome. Ni-Cd system may last over 5 Years if Candle is allways on Mains. Sealed Lead Acid system may go upto 2-3 years life but will have more punch. A SuperCap system may last more than 12 Years, i feel. Source in Cadsoft Eagle format.

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