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  1. nasukaren

    Tesla and Panasonic Collaborate Next-Gen Cell Development

    Sounds great! If they don't bloat when over discharged or explode when over charged -- and are available to us tinkerers for less than < $5 a cell, I'm all for them! One can wish. :) Karen
  2. nasukaren

    Eagle tree elogger V3 - Cheap DIY Thermistor? Found+Tested!

    So any updates on this thread? I'd also like to needle EagleTree a bit more into making their product open source and expandable. They really need to open up the data tx protocol -- as well as let us know what the sensor values are so we can hack them ourselves. K
  3. nasukaren

    How much money have you burned?

    Damage so far: * One Doc Wattson power monitor * One ESC (rc motor speed controller) * One servo tester * One burned finger * One soldering iron * some other stuff... mumble... mumble....
  4. nasukaren

    How much money have you burned?

    How much magic smoke from parts have you released or otherwise destroyed in the making of your e-bike? Include motors and controllers burned out, welders welded to themselves, visits to the ER, frames bent in half, wheels tacoed, holes punched in walls, grandma's washing machine all scratched...
  5. nasukaren

    whats your favorite beer

    diet cola all the way! k
  6. nasukaren

    high power/high speed BLDC controller build

    Congrats! I love my little hobby city motor in my moped-EV. It just keeps whirring along like a dream. You've most probably read my whole saga on how I burnt out my first el-cheapo ESC in the first test run and ended up getting a Castle Creations Phoenix. I'd love for their to be a good...
  7. nasukaren

    How Fast is your Ebike versus How Fast do you want it?

    My moped-EV goes 45 kph @ 36 volts right now, 30 kph if I only hook up two of the SLAs. I could go to 48 volts and I guess it would be 60 kph but that's a bit fast for a little old Italian moped. Right now, I'd rather go for range and am trying to figure out what I should do -- go NiMH or go...
  8. nasukaren

    Wall wart dc/dc power supply

    The switching ones are the best since they're essentially a rectifier (to get DC) and then a switching power supply like a buck converter. So they don't care what type of dirty power or AC/DC they get. Lots of the automobile EV folks use 120 VAC --> 14 VDC laptop switching power supplies for...
  9. nasukaren

    Where can I buy these connectors?

    Those are just regular bullet connectors. RadioShack stocks them, so do most auto parts stores. They are usually prewired, so you'll need to splice them in. Try to get ones that are 10Ga wire if possible. I personally would use the opportunity to replace them with a better type of connector...
  10. nasukaren

    Yet another Yellow Ninja 250 Conversion!

    p.s. Have you thought of getting a high-voltage bulb for your headlight and just running it straight off your high-voltage line? That way you don't have to fool with DC-DC converters. You can get 100VAC halogens and just run them a little cool.
  11. nasukaren

    Yet another Yellow Ninja 250 Conversion!

    After bad luck with an ebay special, I made my own DC-DC converter using a National Semiconductor LM2576HVT-12-ND buck-converter from Digikey. It's rated to 3A passive and 5A active cooling. You could easily hook 3-4 of them up in parallel to give you 10-20A of 12VDC. The schematic I used is...
  12. nasukaren

    Gender?

    The crowd over at the 'V' is definitely different than here. The 'V' is like an enthusiasts' picnic at a state park, while E-S is more like a biker bar. :-P K
  13. nasukaren

    Using RC motors on E-bikes [Archive]

    1) That 100A controller is most probably only for peak current draw and might blow with the kind of sustained current draw we use in our bikes. My first cheapo "100A" controller blew because it couldn't handle the back-EMF from when my bike was slowing down against the motor... 2) That little...
  14. nasukaren

    E-Trike Project

    What a fantastic ride! This is one thread that I'm definitely glued to. Good on ya! Perth is at UTC +8 and California is UTC -7 so there's a 15 hour time difference. When it's 10 pm at night in Perth, it's 7am in California, so if you want to reach them during business hours, business...
  15. nasukaren

    Using RC motors on E-bikes [Archive]

    John - No, it's part of the Piaggio's original gearing. I don't know if all mopeds have this or if it's unique to the Piaggio, either, as this is the only moped that I've worked with. It is very handy though and has made my conversion incredibly easier! In fact, right now I have a taller...
  16. nasukaren

    Using RC motors on E-bikes [Archive]

    Matt - Thanks for the kind words! You were my inspiration! You can run the HV110 up to an absolute max of 50.4 volts according to a personal e-mail I received from Castle Creations tech support. Note that the fully charged voltage of 4 x 12V SLAs or 40 NiMH batteries is slightly more than 52...
  17. nasukaren

    Using RC motors on E-bikes [Archive]

    I just removed the pot on the servo tester itself and then extended it to my handlebars. Works great. Once my Magura throttle (backordered) arrives, I'll be able to use that instead. And I also hope to wire in the brake sensor as well as the Cycle Analyst output into the throttle input as well...
  18. nasukaren

    Using RC motors on E-bikes [Archive]

    Dany - Check Scott or Recumpence or my own blog for our notes on using RC ESCs and motors. I'm personally using a Phoenix HV110 after my cheapo Elf blew out from what I think is back emf generated when I slowed down -- i.e., what you are calling the freewheel effect. A good ESC like the...
  19. nasukaren

    Using RC motors on E-bikes [Archive]

    Matt -- You and Scott were totally my inspirations! Now that all my bike is waiting for is the Magura throttle and bigger beefier batteries, I can't thank you guys enough! Karen
  20. nasukaren

    Cycle Analyst controlling a 0-5K Magura throttle?

    Fechter-san I'm using the servo tester for my rc ESC. It has a little 5k pot in it. I think its internal voltages are 5V as that's what the BEC supplies to it. Would I connect the "to controller throttle input" line above to the wiper of the 5K pot? Or to one of its legs? Thanks so much...
  21. nasukaren

    Cycle Analyst controlling a 0-5K Magura throttle?

    Hiya - I just bought a Cycle Analyst and will be using it on my moped conversion. I was very interested in the current limiting / speed limiting / low-voltage detecting aspect of the C-A, but it looks like that it was designed mainly for a Hall-type throttle. Can anyone help me figure out...
  22. nasukaren

    Using RC motors on E-bikes [Archive]

    One thing I noticed about my HXT 80-100 outrunner and Phoenix HV-110 combination is that there is considerable back-EMF when I throttle-down and brake at the same time. Since I don't have a clutch or freewheel, the motor ends up "engine braking" a little bit. This seems to generate a lot of...
  23. nasukaren

    Using RC motors on E-bikes [Archive]

    I had to remove the Smart Temp from the system -- first because it was interfering with the throttle signals, and then entirely as the thermistor crapped out. I don't think it's engineered very well, no potting or waterproofing, etc. A great idea but not one that was implemented well. Right...
  24. nasukaren

    Using RC motors on E-bikes [Archive]

    Hi folks - I'm almost done with my moped conversion using a HXT outrunner motor and a Phoenix HV-110 controller. All is now working and I'm just waiting for more batteries, the Magura throttle, and to install the electronics permanently in the moped body. Oh, and I forgot, I also wanted to...
  25. nasukaren

    Charging RC NiMH battery packs?

    Thanks all for the links! I'll try them out!
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