There are no laws that say that I cant slowly (like it may take years slowly...) erode my leds, or show others how to slowly erode their LEDs.
So, You can run 400ma through the chip, but through the io ports you shouldnt do more than 350, or 300, depending on how you source/sink, and you still have to be careful not to overload any one port, or more than 40ma through any single pin.
Which side is the correct side? left, right, or it depends on the circumstances?
OK I will try one more time, but this is a triumph of hope over expectation because you have ignored facts in the past.I used to do this for a living so I have been involved with this process professionally.Look at how reliability of a circuit is measured, calculated, worked out. An link, this is one of the first I found:-http://www.ece.cmu.edu/~koopman/des_s99/electronic_electrical/Look at the bath tub curve. This shows that you can get a failure at any time but there is more chance of getting one early or late.Read the bit about stressing components.Now the more a thing is subjected to stress, the shorter is it's life, this applies for lots of things including electrical circuits.[..shortened..]Now do you understand why one sample tells you nothing about the reliability of a system design?
Now the more a thing is subjected to stress, the shorter is it's life, this applies for lots of things including electrical circuits
Quote from: Hippynerd on Feb 08, 2013, 04:25 amWhich side is the correct side? left, right, or it depends on the circumstances?Whichever side means you're not constantly swerving to avoid trucks.If you were proposing some smart way of driving cross country to arrive sooner and use less fuel then we might listen but you're not. You're just saying that driving on the wrong side is possible under some circumstances.Maybe so, but:a) You're constantly dodging trucks (and one day they will get you)b) You're not going to arrive at your destination any sooner, so why bother?c) You're using more gas and wearing out more brake pads and tires. You'll get through more cars than people who just drive properly.
Have you noticed that all your analogies paint me as reckless?
In the case of the charlieplexed RGB cube that uses no current limiting resistors
QuoteHave you noticed that all your analogies paint me as reckless? What you? You are a model of caution and good sense.QuoteIn the case of the charlieplexed RGB cube that uses no current limiting resistors Oh that well maybe, tell me again what limits the current through the LED? If you think it is the constant switching on and off then tell me what the current is when it is on. Have you measured this or calculated this? Or heaven forbid have no idea at all, I am sure it can't be that as that would make you reckless and as you have said you are not reckless.Everyone starts off being ignorant, that is no problem, it is how it has to be. I used to tell my students that ignorance was the prerequisite of learning. However choosing ignorance and forsaking learning, is what I can only describe as being supremely differently clever. Surley you are not that clever are you?
I have mentioned that I think the LEDs are not getting 5v (probably closer to 4.5v, and that maybe the other reversed LED in the circuit is having some current limiting effect.
I looked over mikes decoupling page, and things are still rather complicated and hard to understand everything, but its good to have that as a reference. As I understand it, if the caps arent quite right, there can be a lot of RF noise, and I guess its common for folks to just throw some caps at it, and be unaware of the noise issue. I dont like solving problems by making other problems, which is what im trying to avoid, while learning...