22 μF 16V Tantalum Capacitor
1 μF 35V Ceramic Capacitor
100K, 1/8W Resistor
27Ω, 1/8W Resistor
1N5819 (40V) Schottky Diode
100 μH 550 mA Conformal Coated Inductor
2N7000 N-Channel MOSFET
ATtiny11L Microcontroller (programmed)
White LEDs ( 6,000 mcd or higher) at 3.5V, 20 mA
YOUR COMPLETE BATTERY SOURCE
2-way Radio ● Cellular ● Digital ● Camcorder
Laptop ● Chargers ● Analyzers ● Cells
HIGHER CAPACITY ● HUGE SAVINGS!
Custom Assembly & Battery Rebuilding for:
• Handheld Radios • Laptop • Camcorder • Test Equipment
energy savings, and the last two
versions outperform their predecessors in brightness. In addition to
household use, the last two can be
used for camping or for an emergency
light. The use of a microcontroller
improves circuit efficiency.
In order to minimize my work, I
used all the original mechanical parts as
much as possible, so no switches or
reflectors had to be replaced; even the
original battery holders were kept intact.
As a by-product, the boost voltage technology learned here can be
applied to other fields. For example,
most MCU programmers require 12V
for the Flash memory programming.
Now you know it’s easy to get it from
a USB port 5V power supply by using
this boost voltage technology.
I like the power my LED flashlight
has in the dark. It makes me think back
to when our ancestors discovered fire
and invented lights. LED flashlights are
just a snippet in history. NV
 G. Y. Xu, “Programming the 52 cent Micro,”
Nuts & Volts, February 2006.
OEM Battery Packs
20585 Camino Del Sol Unit B, Riverside, CA 92508
5000+ Batteries Online
■ For MOSFETs, inductors,
especially the 100 μH inductor
(Jameco part #642492)
■ For white LEDs and the 52 cent
■ For surplus white LEDs,
NOTE: The following is available
G. Y. Xu, P.O. Box 14681, Houston, TX
Programmed ATtiny11L (with
CPUMP.BIN or CPUMP1.BIN;
please specify when ordering) — $1
each. (Send payment in with a
self-addressed stamped envelope
for free shipping.)
For more information, visit www.