| |
G8MNY > TECH 03.07.05 09:27l 54 Lines 2006 Bytes #999 (0) @ WW
BID : 52726_GB7CIP
Read: DL3SJB DL8UR GUEST OE7FMI
Subj: LED Lights
Path: DB0FHN<DB0FOR<DB0SIF<DB0FHK<DB0LJ<DB0RES<ON0AR<VE3FJB<IK6PYS<7M3TJZ<
HG8LXL<CX2SA<GB7CIP
Sent: 050703/0815Z @:GB7CIP.#32.GBR.EU #:52726 [Caterham] $:52726_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
From Henner DC0OS @ DB0UHI.#NDS.DEU.EU (Apr 05)
LED an 1,2 V DC0OS 2/2005
ÚÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄo +
³ ³ ÚÄÄÄÄÄÄ¿ ³ 1.2v
³ 1k ³ ÚÁ¿|ÚÁ¿
³ ³ ³ 100³ ³|³ ³40
³ ³ ³TurnsÀÂÙ|ÀÂÙTurns
³ ÃÄÄÄÙ ³ ÃÄÄÄÄÄÄo
³ ³ ³ ³/ _³_
=== === ÀÄ´ NPN _\_/_ LED
³100 ³100 ³\e ³
³ nF ³ nF ³ ³
ÀÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄo -
It works down to 0,7 V.
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 and 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 and 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, and 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
------------------------------------------------------------------------------
For automated garden lights..
ÚÄÄ´>ÃÄÄÄÄÄÂÄÄÄÄÄÄÂÄÄ> +1.2V
³ ³ ³/e
Photo ÃÄÄÄÄ22KÄÄÄ)ÄÄÄÄ´ PNP
Cell _³_ _³_ ³\
----> Ü AA Ü ÀÄ1KÄ>
----> ³ NICAD ³
ÀÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄ
The photocell is quite conductive in no light & turns on the PNP, this alows
bias current flow to start up the inverter.
Why Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
Read previous mail | Read next mail
| |
