AlxSmith JouleThief - WarHawk Tweak

2 layer board of 2.25x0.67 inches (57.10x17.09 mm).
Shared on June 23rd, 2016 04:37.

Original share here

Same design, I just made the traces larger, made the holes VIA’s (battery holder is rock solid now and doesn’t rip traces off the board so easily), and shrank the board a bit to fit the overall size of the AA holder, and a few minor cosmetic tweaks

Schematic shows BC548 transistors, but you can also use PN2222A transistors you just have to put them in backwards as the B/C/E is reverse from the BC548’s (thus the labeling of the BCE on the board)

The thruhole design makes the retention of the components MUCH stronger than the original design that relies upon just the copper pour for keeping the traces on the board, I have built 6 of these, they run for 7~ days on a fresh battery, and over 3 days on a .9vdc (considered dead) battery at enough light to see fairly well by

Kudo’s to Alex Smith on his original design

BOM:

R1, R3 = 1K 1/4W RESISTORS - CF14JT1K00CT-ND

R2 = 2K2 1/4W RESISTOR - CF14JT2K20CT-ND

L1 = FIXED INDUCTOR SMD MOUNT 470uH - 595-1353-1-ND

C1 = 470PF CERAMIC CAP - BC2681CT-ND

C2 = 100uF ALUMINUM CAP - 399-6600-ND or any stumpy 100uf capacitor stumpy C2

TRANSISTORS = BC548 or if mounted backwards PN2222A - BC548BTACT-ND or PN2222AD26ZCT-ND

LED and LED HOLDER = HIGHEST Millicandela Rated 5MM ROUND DOME LED YOU CAN FIND, AND HOLDER TO MAKE IT LOOK CLEAN ON THE BOARD

BATTERY HOLDER = 1CELL AA PC MNT - 36-2460-ND

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