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Recent content by whiteoutage

  1. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    Had an immediate basement flashlight need so back to the adapter configuration. May have to make a hot swappable AC/DC mod.
  2. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    Trial and error - story of my life.:rolleyes:I may be slow but once I understand something it tends to stick with me (ihope). With a 2S battery configuration I'll do same trial/error to get a safe current for LEDs. This time I'll use the magic formula from Steve's dissertation: (R = (V - Vf) /...
  3. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    Found a little better power supply. A switch mode 6V @ 2A. Without a resistor the lamp draws 2A or 11W. With a 2 ohm two watt resistor pulls .60A, or double the previous 1A wall wart. Resistor only got warm, not hot after half an hour - lamp heatsink also just a little warm(seams like .6A...
  4. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    Not sure what amperage these LEDs amperage specification are but no matter what voltage I applied to them they take about 5.5V so with a cheap class two 6V 1A wall wart I experimented with several high wattage resistors. With no resistor at all they only suck up 1A so this lamp is definitely...
  5. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    Here are some pictures of the damaged LED driver board. Looks like there are only two affected components, and the extracted capacitor tests good. That leave a mystery component. The car accident jettisoned the lamp assembly leaving behind the cord with missing piece, and in the process...
  6. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    Thank you Harold, and thank you Steve for the informative article. I should be able to take it from there. Guess I'd heard about current limiting before but sometimes, for us hard headed types, it takes a project to iron in the concept. :rolleyes: Still, it would be cool to know how all of...
  7. W

    Repurpose a Road-Kill Auto Head Lamp - Help!

    The circuit board(not pictured) was damaged. Would like to use as a work light in my garage? Can I just hook up a 12V power supply directly to the LEDs(second picture). I did test them and there are six LEDs in pairs of two. Don't have a proper power supply so applied 5V with my old phone...
  8. W

    Charging Lithium Battery Pack without Charger

    Oh well, the pack's mysterious cut-out voltage at 17.5V is now a feature I dub "SUPERMAX under-voltage protection".
  9. W

    Charging Lithium Battery Pack without Charger

    My previous question may not have been grammatically or logically clear. For those playing along, probably no one at this point, I have converted with some success, an 18V 10 battery pack to a 5 battery 18V pack while keeping the PAK's existing circuitry. Still getting full amperage/voltage...
  10. W

    Charging Lithium Battery Pack without Charger

    While watching one of bigclivdotcom's youtube videos I heard that lithium batteries high end voltage is about 4V and low end is about 3V - so discharge protection should be kicking in at about 3V, but my batteries are quitting at about 3.5V average. Guessing the control circuit thinks there are...
  11. W

    One of the LEDs that shows time on my alarm clock is behaving badly -- 7 Segment LED Display

    Even a hillbilly can understand when it is time to throw in the towel - I hope. You guys are the best! "God grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom to know the difference" Karl Paul Reinhold Niebuhr (1892–1971
  12. W

    One of the LEDs that shows time on my alarm clock is behaving badly -- 7 Segment LED Display

    Yes, it is a 2 cent clock, but maybe an OK way to cut your teeth on electronics repair, at least for hillbillies like myself?:)
  13. W

    One of the LEDs that shows time on my alarm clock is behaving badly -- 7 Segment LED Display

    Consensus is IC is knackered. Anyhow, took some voltage measurements for practice. Voltage drops from resistor 103 (the big honking resistor next to the IC) to 9 LED pins of the 1st two digits (first digit only has two pins and 2nd digit has 7 pins) . Measurements were taken while the clock...
  14. W

    One of the LEDs that shows time on my alarm clock is behaving badly -- 7 Segment LED Display

    no freezer or air here would it hurt to stick in the freezer for half an hour?
  15. W

    One of the LEDs that shows time on my alarm clock is behaving badly -- 7 Segment LED Display

    Thinking there may be a way to rule out defective parts out by somehow taking voltage measurements but I have no clue as which pins should be probed and what expected voltages should be? Maybe the problem pin six is getting a negative voltage instead of a positive voltage? Any advice on taking...
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