On Fri, 26 Dec 2008 23:55:48 +0100, "Steve Lusardi"
wrote:

I'm proud of you! I hope you used a voltage regulator for the LEDs? If you
didn't, you will seriously kill the expected life span.
Steve

Nope, the LED's he is talking about are designed to operate in a 12
VDC system, i.e., with system voltages as high as, probably, 15 VDC. I
initially built voltage regulators into the light fixtures I built
using the same 30 LED tubes. Bad! Dim lights. Then I had a closer look
at the "tubes". The LED's are wired in series parallel with resisters
for each series section to limit current Flow. You just plug them in..

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

Bruce In Bangkok wrote in
:

On Fri, 26 Dec 2008 23:55:48 +0100, "Steve Lusardi"
wrote:

I'm proud of you! I hope you used a voltage regulator for the LEDs? If
you didn't, you will seriously kill the expected life span.
Steve

Nope, the LED's he is talking about are designed to operate in a 12
VDC system, i.e., with system voltages as high as, probably, 15 VDC. I
initially built voltage regulators into the light fixtures I built
using the same 30 LED tubes. Bad! Dim lights. Then I had a closer look
at the "tubes". The LED's are wired in series parallel with resisters
for each series section to limit current Flow. You just plug them in..

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)


Have you guys ever noticed how they "dim" LEDs for tail lights that
brighten to full power when you apply the brake lights?

The dim mode they feed a 50% duty cycle pulse at a kilohertz or so, not
important just too fast for human eyes to respond. Move your eyes fast
back and forth as you follow them and you can see they are pulsed on and
off very rapidly. Then, when the brake switch closes, the same LEDs
brighten up with pure DC applied for maximum brightness. It would be a
simple matter to build an LED dimmer for them out of a 555 timer IC as a
variable pulse width pulse generator driving a power transistor to
handle the load of the string......
http://www.rmcybernetics.com/project..._pulse_control
ler.htm
The heatsink is WAY overkill as the transistor is either off or
saturated. It will hardly get warm, even at 10A.

Larry wrote:

Bruce In Bangkok wrote in
:


On Fri, 26 Dec 2008 23:55:48 +0100, "Steve Lusardi"
wrote:


I'm proud of you! I hope you used a voltage regulator for the LEDs? If
you didn't, you will seriously kill the expected life span.
Steve


Nope, the LED's he is talking about are designed to operate in a 12
VDC system, i.e., with system voltages as high as, probably, 15 VDC. I
initially built voltage regulators into the light fixtures I built
using the same 30 LED tubes. Bad! Dim lights. Then I had a closer look
at the "tubes". The LED's are wired in series parallel with resisters
for each series section to limit current Flow. You just plug them in..

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)



Have you guys ever noticed how they "dim" LEDs for tail lights that
brighten to full power when you apply the brake lights?

The dim mode they feed a 50% duty cycle pulse at a kilohertz or so, not
important just too fast for human eyes to respond. Move your eyes fast
back and forth as you follow them and you can see they are pulsed on and
off very rapidly. Then, when the brake switch closes, the same LEDs
brighten up with pure DC applied for maximum brightness. It would be a
simple matter to build an LED dimmer for them out of a 555 timer IC as a
variable pulse width pulse generator driving a power transistor to
handle the load of the string......
http://www.rmcybernetics.com/project..._pulse_control
ler.htm
The heatsink is WAY overkill as the transistor is either off or
saturated. It will hardly get warm, even at 10A.




404 Larry!

"Larry" wrote in message
...
Bruce In Bangkok wrote in
:

On Fri, 26 Dec 2008 23:55:48 +0100, "Steve Lusardi"
wrote:

I'm proud of you! I hope you used a voltage regulator for the LEDs? If
you didn't, you will seriously kill the expected life span.
Steve

Nope, the LED's he is talking about are designed to operate in a 12
VDC system, i.e., with system voltages as high as, probably, 15 VDC. I
initially built voltage regulators into the light fixtures I built
using the same 30 LED tubes. Bad! Dim lights. Then I had a closer look
at the "tubes". The LED's are wired in series parallel with resisters
for each series section to limit current Flow. You just plug them in..

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)


Have you guys ever noticed how they "dim" LEDs for tail lights that
brighten to full power when you apply the brake lights?

The dim mode they feed a 50% duty cycle pulse at a kilohertz or so, not
important just too fast for human eyes to respond. Move your eyes fast
back and forth as you follow them and you can see they are pulsed on and
off very rapidly. Then, when the brake switch closes, the same LEDs
brighten up with pure DC applied for maximum brightness. It would be a
simple matter to build an LED dimmer for them out of a 555 timer IC as a
variable pulse width pulse generator driving a power transistor to
handle the load of the string......
http://www.rmcybernetics.com/project..._pulse_control
ler.htm
The heatsink is WAY overkill as the transistor is either off or
saturated. It will hardly get warm, even at 10A.



But the most important question is this: Do LEDs suffer from
"sulphation(sic)?" Bwahahahahahah!

Wilbur Hubbard

On Sat, 27 Dec 2008 14:21:21 -0500, "Wilbur Hubbard"
wrote:
...
But the most important question is this: Do LEDs suffer from
"sulphation(sic)?" Bwahahahahahah!

Wilbur Hubbard

When digging a hole, a wise man stops as soon as possible.

BrianW

On Sat, 27 Dec 2008 13:31:09 -0600, Brian Whatcott
wrote:

On Sat, 27 Dec 2008 14:21:21 -0500, "Wilbur Hubbard"
wrote:
..
But the most important question is this: Do LEDs suffer from
"sulphation(sic)?" Bwahahahahahah!

Wilbur Hubbard

When digging a hole, a wise man stops as soon as possible.

BrianW


Unfortunately Willie is not a wise man...
Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

"Brian Whatcott" wrote in message
...
On Sat, 27 Dec 2008 14:21:21 -0500, "Wilbur Hubbard"
wrote:
..
But the most important question is this: Do LEDs suffer from
"sulphation(sic)?" Bwahahahahahah!

Wilbur Hubbard

When digging a hole, a wise man stops as soon as possible.

BrianW


Masturbate ----------- masturbation
Inculcate -------------- inculcation
Equate----------------- equation
Educate---------------- education
Stipulate---------------- stipulation
Calculate--------------- calculation
Defecate---------------- defecation
Demonstrate------------ demonstration
Castrate----------------- castration
Sulfate------------------- Sulfated, sulfates, sulfating, sulfation

You must examine the root of the word. You don't change the root of the word
when adding a suffix. Duh!

http://en.wikipedia.org/wiki/Sulfation

Wilbur Hubbard

On Sun, 28 Dec 2008 16:10:43 -0500, "Wilbur Hubbard"
wrote:


When digging a hole, a wise man stops as soon as possible.

BrianW



Sulfate------------------- sulfation

You must examine the root of the word. You don't change the root of the word
when adding a suffix. Duh!

http://en.wikipedia.org/wiki/Sulfation

Wilbur Hubbard


Here you go Mr Stupid:

BrianW
************************************************
Sulphation
From Wikipedia, the free encyclopedia

Sulfation
from "http://en.wikipedia.org/wiki/Sulphation"

"Brian Whatcott" wrote in message
...
On Sun, 28 Dec 2008 16:10:43 -0500, "Wilbur Hubbard"
wrote:


When digging a hole, a wise man stops as soon as possible.

BrianW



Sulfate------------------- sulfation

You must examine the root of the word. You don't change the root of the
word
when adding a suffix. Duh!

http://en.wikipedia.org/wiki/Sulfation

Wilbur Hubbard


Here you go Mr Stupid:

BrianW
************************************************
Sulphation
From Wikipedia, the free encyclopedia

Sulfation
from "http://en.wikipedia.org/wiki/Sulphation"



Hah ahhahha! Good try.

Wilbur Hubbard

On Sat, 27 Dec 2008 14:21:21 -0500, "Wilbur Hubbard"
wrote:

But the most important question is this: Do LEDs suffer from
"sulphation(sic)?" Bwahahahahahah!

Wilbur Hubbard

Well Capt. Hubbard, I will be in the Keys soon, and will be on the
lookout for small outboard powered sailboats that don't seem to have
all of their screws turned down tightly.