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Search took 0.00 seconds. Search: Posts Made By: SoonerSailor
Forum: Marine Electronics 30-12-2010, 13:20
Replies: 49
Views: 14,541
Posted By SoonerSailor
Don - you will want to use a switching DC-DC...

Don - you will want to use a switching DC-DC converter to do as you propose.

The LT1003 and LM7805 you mentioned earlier are linear regulators that dissipate into heat the voltage drop at the...
Forum: Marine Electronics 30-12-2010, 08:47
Replies: 49
Views: 14,541
Posted By SoonerSailor
"BTW, the eye can detect a 2% change in...

"BTW, the eye can detect a 2% change in brightness"

That would only be true for a rapid change in light level. A long used rule of thumb is that typically a 50% difference in light level is...
Forum: Marine Electronics 29-12-2010, 18:53
Replies: 49
Views: 14,541
Posted By SoonerSailor
I'll have to disagree with Dave about luminosity....

I'll have to disagree with Dave about luminosity. While a reduction of 33%, from 1.5 to 1.0 as in his example, might seem great, to the eye and brain it is perceptually a far smaller change than...
Forum: Marine Electronics 29-12-2010, 14:58
Replies: 49
Views: 14,541
Posted By SoonerSailor
When comparing efficiency, keep in mind that...

When comparing efficiency, keep in mind that constant current regulators typically are only 80% to 90% efficient. If the added total of forward voltage drop of your string of LEDs is fairly close to...
Forum: Marine Electronics 27-12-2010, 05:35
Replies: 49
Views: 14,541
Posted By SoonerSailor
Funny how some people actually enjoy cobbling...

Funny how some people actually enjoy cobbling together their own hardware. Of course there is also a very great danger of learning something in the process. It really is much safer in that event to...
Forum: Marine Electronics 24-12-2010, 12:07
Replies: 49
Views: 14,541
Posted By SoonerSailor
This is not true. The Eye/Brain is a light...

This is not true. The Eye/Brain is a light integrating system. If an LED is on 50% of the time at a fixed current, the eye will not see more light than if it were on continuously at half the current....
Forum: Marine Electronics 24-12-2010, 07:24
Replies: 49
Views: 14,541
Posted By SoonerSailor
Using a simple resistor might actually work just...

Using a simple resistor might actually work just fine, in my opinion, and I think the OP should give it a try just to see how it works for him. Let me just mention a couple of things to keep in...
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