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    DIY Programmable BMS (now using ATtiny/Arduino)

    I use OSHPARK for protos, but they are way to expensive if you are doing any quantities of boards. I have also used MYLYDIA for production boards... around 12 cents per square inch/2000 sq in minimum order.
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    Amberwolf's Delta Trike Build v1.0 (The Delta Tripper)

    How many SPERM (spokes per mile) does this thing get?
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    DIY Programmable BMS (now using ATtiny/Arduino)

    Make the board 100x150mm (or a tad smaller) and SeeedStudio can make them fairly quickly for a rather good price. Their prices are based upon the board outline fitting within various rectangles.
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    building my own bike light budget $50

    You get what you pay for... the best Chinese 100 watt array puts out less light than a Bridgelux array at 60 watts. Surface area is everything when it comes to passive cooling of LEDs.
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    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Thats a REALLY crappy FET. Try an IRLB3036. It has 1/10th the on resistance and will dissipate 1/10th the power.
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    Thread for new battery breakthrough PR releases

    BR549
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    building my own bike light budget $50

    No way. Those LEDs will be a puddle of molten slag within seconds. You need massive heatinking on those things (like 10 square inches of surface area per watt) unless you use forced air cooling.. Also those Chinese LED arrays are crap. Search Digikey for arrays made by Bridgelux. Here is...
  8. T

    Amberwolf's Flatbed Kennel Trailer

    Reliable? Amberwolf concoction? Yeaaaah, riiiiight. Are you going to install the automatic spoke snappers and tire flatteners? :roll:
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    Throttle Smoother 3.0 - Linear Ramp Circuit

    I see no power supply bypass caps... could cause some problems... like oscillation.
  10. T

    Fisher Price: My First Delta-Wye Conversion

    Those Sparkfun key switches are crap... avoid them!
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    How to reduce drift after soldering shunt?

    Proper shut wire is made from alloys that have a very low temperature coefficient (home much the resistance changes with temperature). Solder does not. Also you may be getting a thermocouple effect due to the dissimilar metals in contact. But I don't think that is the reason for what you...
  12. T

    Cheap DIY BMS

    Run the balancer all the time (whether charging or running the motor). I built some small ones a while back: http://endless-sphere.com/forums/viewtopic.php?f=14&t=20864
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    Amberwolf's Delta Trike Build v1.0 (The Delta Tripper)

    You should just mod a Big Wheel! You would be the coolest kid on the block.
  14. T

    Build your own CD battery tab welder for about $100.00+-

    You don't want a sharp point on the electrodes. A rounded tip works much better.
  15. T

    Cheap PCB manufacturing!

    Not to mention that they are made the USA! And are purple. As far as KiCad files, you will have to ask them. You can always send them Gerber files.
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    2WD Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"

    It's called inchflation... very similar to the ounceflation that you see in packaging (like 8 ounces of product in a 16 ounce sized package)
  17. T

    16 years... working for the man... been set free !

    Just remember, as long as you can say these words, you'll always have a job: "Would you like fries with that?" :lol:
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    Cheap PCB manufacturing!

    No you don't! Just email your Eagle .BRD files to http://oshpark.com/ and for 5 bucks a sq in, no setup or domestic postage, you get three boards.
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    2WD Semi-Recumbent Recycled-Parts Cargo eBike: "CrazyBike2"

    Ahhh, now that's the Amberwolf we all know and love... it's hard to believe you went so long without a wheel disaster.
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    Smoke from fire kill componets ?

    It can deposit a conductive film of carbon particles. But If the device isn't covered in black spooge, it should be OK.
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    How to drive high-side N-channel FET to saturation??

    Almost all the data sheets mysteriously don't discuss the matter. Ask their FAEs and you get the song and dance routine. You do find some app notes that have circuits with external devices that address the matter. I don't know of any chips that for sure can keep the high side FET on at DC.
  22. T

    How to drive high-side N-channel FET to saturation??

    And remember, standard bootstrap circuits/high side drivers are useless if you need the high side FET to be on continuously...
  23. T

    Got 150W 980nm laser pump.. now watt?

  24. T

    Lifepo4, never below voltage?

    Katou sent me a bunch of A123 cells that were at 0V to test my welder. On a whim I charged them up. Half were perfectly good and are still going strong. I did manage to kill one by leaving a 4S pack connected to a load for a month.
  25. T

    Thread for new battery breakthrough PR releases

    Sanyo is currently shipping a 4.3V/3400 mAh 18650 LiCo cell... 4.3V is a minor improvement over 4.2V, but they seem to be the only one to make it a commercial reality. Raising lithium chemistry voltage is tough to pull off in the real world...
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