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  1. disadvantage

    "Open source" motor?

    I searched for "ferrite" at mouser.com, and discovered a company called Fair-Rite that sells ferrite bobbins: http://www.fair-rite.com/cgibin/catalog.pgm?THEAPPL=Inductive%20Components&THEWHERE=Open%20Magnetic%20Circuit&THEPART=Bobbins Click the Power Applications tab near the top. Would these...
  2. disadvantage

    Puma Stripped to the Bone to check Rotor Bearing

    Many thanks for the pictures, Knoxie. You always provide quality content to this forum. I'd like to remove (and put back in) the axle from the rotor in my Puma motor. Once the axle is out, I want to chuck it into a lathe and drill a hole clear through it. This way, I can run heavy phase...
  3. disadvantage

    Even Newer 4 to 24-cell Battery Management System (BMS)

    Wait a minute; don't you "down under" people have Dick Smith Electronics? http://www.dse.com.au/cgi-bin/dse.storefront/
  4. disadvantage

    What direction should the U.S. take for the future?

    Fine then, I'll reply. Let's see how quickly I become a fool for posting. Anyway, my intention is to show what I've been studying, and find out what others think about it. I voted for Capitalism, but I want a change: No more Fiat Money! Money As Debt...
  5. disadvantage

    Switch mode supply mod

    You are connecting 15 a123 cells in series. a123 cells are charged to 3.65V per cell, so your battery pack should be charged to 15 * 3.65V = 54.75V. IMO 55V is close enough. I'll assume you know what you are doing, and set the 110V/220V switch to 220V before plugging into your 230V mains...
  6. disadvantage

    Commanda's BMS

    Thank you for sharing! Would you please tell me the values of R1 and R2 on the second page of the pdf? These are the resistors connected to the bases of Q2 and Q4. I can't quite make out their values; the pdf is a bit blurry. I like how you implemented automatic charge shut-off. This, I...
  7. disadvantage

    should religious institutions be tax-exempt?

    This is exactly what happened to me, only more like 70%.
  8. disadvantage

    Those Lil Japanese Mini Trucks... Conversion Prospects?

    Google & Wikipedia to the rescue: http://en.wikipedia.org/wiki/Kei_truck "Kei Truck" is what the Japanese call a "Mini-Truck." And finally, a website with US mini-truck laws, state-by-state: http://www.iihs.org/laws/minitrucks.aspx Last updated September 2008.
  9. disadvantage

    Those Lil Japanese Mini Trucks... Conversion Prospects?

    Do these mini-trucks have VINs? Are they easily licensed for on-road use?
  10. disadvantage

    home style breaker for ebike use

    I have questions on this topic. The only place I know of to get these "car-audio circuit breakers" is PowerWerx.com: http://www.powerwerx.com/product.asp?ProdID=3323&CtgID=1774 Where else can these be purchased online? I like the Buss circuit breaker shown above. I read somewhere it can be...
  11. disadvantage

    Even Newer 4 to 24-cell Battery Management System (BMS)

    Could I please have a less-blurry final schematic? I'd like to route my own circuit board, and place the multi-pin connector and output power circuitry at one end, instead of along the top edge. If I do this, I can make a narrower (but longer) board, which should match my pack dimensions more...
  12. disadvantage

    poll: do you wish for higher fuel prices or lower

    I'm in favor of high fuel prices, to make people change their habits and make the world a better place to live. This is how I understood what EMF said in another thread on this forum. US gas & diesel is too cheap because it is heavily subsidised by taxpayers. I wouldn't mind a big tax on...
  13. disadvantage

    Where can one get 'conformal coating'?

    Why not try brushing RTV silicone caulking over your circuit board? Wouldn't that work? That material is low cost and easy to find, and you don't need fancy-schmancy equipment to apply.
  14. disadvantage

    Ebike front fork question

    Using a front hubmotor avoids changing the existing rear drive. This means you can use a internally geared hub, or a cassette on a freehub, and if you have one you don't mess-up your existing rear derailer. With that said, I do prefer a rear hubmotor. IMO it just feels wrong to put that much...
  15. disadvantage

    Help With Disassembling EVTECH BMC rear hub motor

    That is a lot of hard epoxy! I had epoxy in my BMC also, but not nearly as much. Looking closely at your image, it appears they even rammed some into the hollow axle! I used a hot soldering iron to soften my epoxy, to help clean up the big blobs on the windings. But it would take a lot of...
  16. disadvantage

    Even Newer 4 to 24-cell Battery Management System (BMS)

    Don't forget: Perfect is the Enemy of Good Enough.
  17. disadvantage

    Dave's stealth Kona Smoke (Heinzmann with Milwaukee)

    Well done Dave! I like your stealthy build, and clever use of the Milwaukee packs, which avoids reengineering a BMS and pack container. What do you use to recharge the packs with? Do you use one, or more, of these?
  18. disadvantage

    55mph Club

    I'm very interested in your project, Steve, but maybe we ought to start a new thread. I hear the Queen of Mean gets nasty if we disrupt her thread. http://en.wikipedia.org/wiki/Leona_Helmsley
  19. disadvantage

    55mph Club

    steveCA, TY for the http://www.greensteamengine.com/ link. It is very interesting. I'd like to build my own CHP (cooling-heating-power) unit for home.
  20. disadvantage

    Point 1 LiPO BMS Issue?

    Glad to hear you got it working, Uplink. Hmm, I made my case to exactly fit the battery, so this wasn't an issue for me. I think wadded-up newspaper would work, despite being a low-tech. Nobody else will know, because they can't see what's inside the box. I used sticky clear plastic...
  21. disadvantage

    Help with LifePo Battery - now what?

    Rassy got it right, on how to connect charger to battery. I should have given as much detail as he did. The 52-56V you observe is the peak (fresh-off-the-charger, no-load) voltage. The nominal voltage is closer to 48V, and you should see this when you connect everything up with the Cycle...
  22. disadvantage

    Point 1 LiPO BMS Issue?

    I am late to this thread, but I'll post anyway. It might help. I've had troubles with the EV Tech battery also. The rescue of my $650 battery starts here: http://endless-sphere.com/forums/viewtopic.php?f=6&t=3672&start=19 It is possible to charge the battery directly with the red-amber-green...
  23. disadvantage

    Help with LifePo Battery - now what?

    P+ and P- are Power output, to your controller and motor. C- is input power from the Charger. Connect your charger to the P+ and C-. What sort of problems do the BMS cables have? Given your list of battery connections, it sounds like the BMS is integrated in the battery.
  24. disadvantage

    Switch mode supply mod

    I owe you an apology, flip_normal. :oops: I assumed all GuoLiLai 500W 48V power supplies have the same circuit board layout. My last post was based on this. I was at work, away from my PS, when I last replied. I went home and took a closer look, and your PS definitely looks different, even...
  25. disadvantage

    Switch mode supply mod

    Yes, I have the 500W 48V model of the power supply. The pictures you posted look identical to mine. R3 is a big fat power resistor on the top of the board, right next to the power out screw terminals. R4 is a tiny surface mount resistor, on the *bottom* side of the board. I tack-soldered a...
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