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G8MNY > TECH 04.05.25 16:49l 80 Lines 2800 Bytes #1 (0) @ WW
BID : 31852_GB7CIP
Subj: LED Lights
Path: JH4XSY<N3HYM<IW2OHX<GB7CIP
Sent: 250504/0746Z @:GB7CIP.#32.GBR.EURO #:31852 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
From Henner DC0OS @ DB0UHI.#NDS.DEU.EU (Updated Jul 12)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
LED at 0.6-1.5V
ﾚﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄo +
ｳ ｳ ﾚﾄﾄﾄﾄﾄﾄｿ ｳ 0.6- 1.5V
ｳ 1K ｳ ﾚﾁｿ|ﾚﾁｿ
ｳ ｳ ｳ 3ｳ ｳ|ｳ ｳ10
ｳ ｳ ｳTurnsﾀﾂﾙ|ﾀﾂﾙTurns
ｳ ﾃﾄﾄﾄﾙ ｳ ﾃﾄﾄﾄﾄﾄﾄo
ｳ ｳ ｳ ｳ/ _ｳ_ WHITE
=== === ﾀﾄｴ NPN _\_/_ LED
ｳ100 ｳ100 ｳ\e ｳ
ｳ nF ｳ nF ｳ ｳ
ﾀﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄo -
It works down to 0.7V.
The LEDs (colours don't mix) may have an alternate connection to +ve with the
cathodes.
The current is dependant on the bias resistor, not from the number of the LED
(tested with 1 & 3). 1 kilo-Ohm let flow 30 mA. More light will give a low ohm
transistor, but not much.
The transformer was built from a choke coil with a ferrite core like dumb-bells
(thats was my Dictionary says |-| ). The 40 turns for the collector filled it
half, the other half was for the basis-turns, the wire was thinner.
The fly-back generator is not optimized, you can experiment with core, turns &
thickness of wire, or use a better transistor with more gain & more current.
Also with the resistor & capacitor. I found the items in a box down in the dark
of my work-bench. I replaced 2 of 3 cells of my lantern, & now it can swim,
I dont have to dive to the ground to get back when it fall out of the boat...
73 from Henner, dc0os
------------------------------------------------------------------------------
White LEDs are about 3V hence the voltage step up circuit needed from 1 or 2
nicad cells. But you would not want to put one on top of a pole holding up HF
Rx ant due to the possable small level QRM!
For automated garden lights..
ﾚﾄﾄｴ>ﾃﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾂﾄﾄ> +1.2V
ｳ ｳ ｳ/e
Photo ﾃﾄﾄﾄﾄ22Kﾄﾄﾄ)ﾄﾄﾄﾄｴ PNP
Cell _ｳ_ _ｳ_ ｳ\
----> ﾜ AA ﾜ ﾀﾄ1kﾄ>
----> ｳ NICAD ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄ
The photocell is quite conductive in no light & turns on the PNP, this allows
bias current flow to start up the inverter.
-------------------------------------------------------------------------------
LED at 11-14V
ﾚﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾂﾄo +
ｳ ｳ White_ｳ_ ｳ +11-14V
ｳ ｳ LED_\_/_ _ｳ_
ｳ ｳ ﾚﾄﾄﾄﾄﾄﾄｿ ｳ /_\
ｳ 1M ｳ ﾚﾁｿ|ﾚﾁｿ ｳ 1N4148
ｳ ｳ ｳ 1ｳ ｳ|ｳ ｳ10 ｳ or schotky
ｳ ｳ ｳTurnsﾀﾂﾙ|ﾀﾂﾙTurnsｳ
ｳ ﾃﾄﾄﾄﾙ ｳ ﾃﾄﾄﾄﾄﾄﾄﾙ
ｳ ｳ ｳ ｳ/
=== === ﾀﾄｴ NPN
ｳ100 ｳ 10 ｳ\e
ｳ nF ｳ nF ｳ
ﾀﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄo -
In this circuit 2-3 times the current flows in the LED than is taken from the
supply.
Why Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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