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G8MNY > TECH 25.11.25 16:52l 79 Lines 4080 Bytes #10 (0) @ WW
BID : 45833_GB7CIP
Subj: Windup Torch info
Path: JH4XSY<N3HYM<GB7YEW<GB7CIP
Sent: 251125/0751Z @:GB7CIP.#32.GBR.EURO #:45833 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Dec 05)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
Not being one to leave a new toy unexamined, here is info I reverse engineered
from one of these fairly cheap LED torches.
o all
ﾚﾄﾄﾄﾄﾂﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄｿ oﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄｿ
_ｳ_ _ｳ_ ｳ R4 ｳ ﾚﾄﾄ>o off D2_ｳ_ _ｳ_D3
/_\ /_\ ｳ 470R ｳ/ ｳ oﾄﾄﾄｿ D1 \_/ \_/
ﾚﾄﾄﾄﾄﾄﾄｴ ｳ ｳ+ ﾃﾄﾄﾄﾄｴT1 ｳ one ﾀﾄｴ>ﾃﾄﾄﾄﾄﾄｴ ｳ1N5817
MOTOR AS ｳD4-7ｳ === _ｳ_ ｳ\___ｳ ﾚﾄﾄﾄﾄﾄ)ﾄﾄﾄﾄﾄｴ
GENERATOR ｳ ｳ ｳC1 /_\' e ｳ R1 R2 R3
ﾀﾄﾄﾄﾄﾄﾄ)ﾄﾄﾄﾄｴ ｳ47uF ｳDW __ｳ__ 68R 68R 68R
_ｳ_ _ｳ_ ｳ25V ｳ5.2V ﾜﾜﾜ _ｳ_ _ｳ_ _ｳ_
/_\ /_\ ｳ ｳ LIRｳ _/ _/ _/
ｳ ｳ ｳ ｳ 2032ｳ LED1 ｳ LED2ｳ LED3ｳ
ﾀﾄﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾙ
HOW IT WORKS
A small motor spin from a 4 gear chain from the crank handle. The motor
generates over 5V and feeds a silicon bridge rectifier D4-7, which I guess is
there just in case the rotation is reversed. This DC feeds C1 and powers up the
zener DW to make T1 conduct current into the 3.6V Lithium Iron rechargeable
button cell until the cell if fully charged and the voltage rises to cut off
the current from T1's emitter. With normal winding speed this takes only 30-60
seconds.
A 4 way push action rotary switch powers the LEDs, either one or all 3 through
low voltage drop steering diodes D1-3 to a current limiting resistor to the
2.6 - 3V Hyper-Bright white LEDs. The battery can light all 3 LEDs for more
than 30 mins on one charge. The light output is quite feeble compared to a
normal torch of the same size, but it is quite enough to read at night etc.
MY IMPROVEMENTS
ﾚﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄｿ o one
ｳ ｳ _ｳ_ ｳ ｳ oﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
1N5817_ｳ_ ｳ =\_/LED 1K ｳ ﾚﾄﾄ>o all ｳ
/_\ ｳ ｳGREEN ｳ ｳ/ ｳ oﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ ｳ
+ｳ ｳ+ ｳ ﾃﾄﾄﾄﾄｴT1 ｳ ｳe ｳ/e e\ｳ
MOTOR AS === 220R _ｳ_ ｳ\____ｳ ｳ/ ﾚﾄﾄｴ PNP ﾃﾄﾄｿ
GENERATOR ｳC1 ｳ /_\' e ｳ ﾚﾄﾄｴPNP 100K ｳ\ ____/ｳ ｳ
TURNED 1 ｳ47uF ｳ ｳ __ｳ__ 47K ｳ\ ｳ ｳ 100K
WAY ONLY ｳ25V _ｳ_ ｳ4.7V ﾜﾜﾜ ｳ ﾃﾄﾄﾄﾄ)ﾄﾄﾄﾄ)ﾄﾄﾄﾄｿ ｳ
-ｳ ｳ /_\' ｳ LIRｳ ｳ _ｳ_ ｳ _ｳ_ _ｳ_ ｳ
ｳ ｳ ｳ5V ｳ 2032ｳ ｳ _/ ｳ _/ _/ ｳ
ﾀﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄﾙ
1/ Constant current to LEDs. Almost constant LED current until the battery
fails with 3 small PNP transistors. The 47K/100K values on the bases depends
on the PNP transistor gain to give the right LED currents of 10mA MAX,
values in the range 22K to 220K may be needed.
Replace the 3 LED 68R with wire links and replace the 3 Schotky diodes with
the PNPs mounted right down for minimum headroom, add the base Rs to nearby
grounds.
2/ Bridge losses removed. Replace the 4 silicon diodes with 1 of the 1N5817
diodes. Make sure the generator is wired up for your favoured rotation
direction. Swap 1 of the +ve rail diode for the 1N5817 and solder the motor
-ve to the -ve rail. Note the free unloaded generator action if reverse
wound.
3/ Battery Charged LED. First I found the original zener diode to be too high a
voltage and the regulator never came in as the new 3.6V battery would not
reach 4.5V to stop the current flow, so I replace the zener with a 4.7V one
selected on test and also doubled the supply R to 1K. Then adding a GREEN
LED with a 220R to monitor the generator voltage with the original zener.
In use it lights up when the handle is cranked hard and then easily when the
battery is charged.
Why don't you write an interesting bul?
73 De John, G8MNY @ GB7CIP
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