Fuzzy logic Mood light with LEDs

Step 4 LED burn in testing

Since my leds have a super wide voltage range and some built in resistors anyways i decided to use a 6v 650ma wall wort with no other electric components to power this lamp. Im not adding any additional resistors because im lazy, but i dont want to burn the house down ether. The simple solution was to drop all the leds in a breadboard and plug them in just to see what happens.

This is a video:

In theory everything about this is wrong, the voltage is to high and there isn't enough current from the transformer. If i remember highschool physics correctly this should rip a hole in space/time within the first 5 minutes. Sadly, after 2 hrs the leds are only slightly warm.

Comments

[treg]

If the Ac adaptator is not able to send enough current, it mean that it will : -Over heat a little (and may became hot during summer days) -Not be able to send as much tension (volts) as it should -Will not be able to send a constant tension (it will vary a little bit with the same period as your AC source, 50 or 60Hz) The two last points explains why you leds do not over heat to much (did you try to read the real tension with a voltmeter ?), but there are certainly better way of doind things, like : -Add a voltage regulator before the leds -Add a non blinking led in serie with each the blinking led, hence double the voltage drop (but you'd have to check the specs of the integrated resistor in the leds to see if the voltage drop is not too strong) -Add a resistor (cost about $0.15 !) Anyway, the leds will age faster, but it is not a real problem. Just remmeber to check the temperatur of the AC adaptator from time to time after long use in hot days just to be sure.

[Pwntalive]

Wow, thats a mouthful. And while you are most likely right on several counts, my unflinching laziness makes me not want to do anything at all at this point. A few months back i snipped the wall wort leads and added a 9v battery clip for portability.