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  1. fitek

    Anyone going to the North American Handmade Bike Show?

    Well after a somewhat disappointing and crowded Saturday, I had a good time on Sunday again. I skipped all but one seminar . Though my mission from the outset was to talk to every single exhibitor (I think there were almost 100), by 3pm I was starting to go hoarse and had only made it through...
  2. fitek

    Anyone going to the North American Handmade Bike Show?

    Bike pr0n as promised. Trouble is, I had a hard time holding my hand still enough so most of the pics came out crappy.
  3. fitek

    Anyone going to the North American Handmade Bike Show?

    Well I'm at the convention center now (thank god for my BlackBerry as they charge $15 for wireless... otherwise I couldn't get my forum fix). I'll see how it goes and post any good bike pr0n I get.
  4. fitek

    Anyone going to the North American Handmade Bike Show?

    It's in Indianapolis Feb. 27th to Mar. 1st. Last year there were supposedly 7000 attendees. This year it looks like 100+ exhibitors, we'll see how many people attend... I figure the ebike world should have some minor representation, at least someone talking about ebikes to the builders, so...
  5. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    Current limit doesn't seem to be working right. I swapped the shunt in the meter and redid it to read 3 amps per tick. I've gobbed half the two shunts in the controller with solder and the current is about 25a full throttle, just like before. Bike is equipped with 12ah of Makita batteries; I...
  6. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    Success! With a 20mhz xtal I can now hit 23mph on the flat. 21mph comes fast then the last 2mph take some time. Upped the current limit too but I don't know how much. My meter maxes out at 30a.
  7. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    What are the MOSFETs in this thing anyway? They are labeled as T430 BN7S9L. The latter finds nothing on Google. Digikey carries 3 MOSFETs named AOT430, they're 75V 80A n-channels in TO-220. 11mOhm and 114nC and 268W max. This controller has 12 FETs so I guess double the power per channel or...
  8. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    I wonder if this problem is related to what everyone was experiencing with the Puma and original ecrazyman controller. Since I'm using a 20" wheel it has to spin a bit faster (compared to a 26") to get up to a normal speed like 20mph. Jonathan loaned me a crystalyte controller for a while in...
  9. fitek

    Gonna get laid off... opportunities in electric land?

    Well the hammer came down today. Shutdown is tomorrow. Blowing what's left on beer. Thanks everyone for your input. I think I'm going to try it all. Apply for full time positions, part time, and throw some things on craigslist and see what sticks. I will also contact local niche bike shops...
  10. fitek

    Gonna get laid off... opportunities in electric land?

    Oh believe me, I have 15 gallons of homebrew sitting around, and I'm drinking some of it right now:) Nothing goes better with DIY electric vehicles than a big bottle of DIY beer. I also grew hops this year (and the year before that, but they all died). They didn't produce anything yet though...
  11. fitek

    Gonna get laid off... opportunities in electric land?

    The startup I helped create and where I've spent nearly the entirety of my professional career will likely not survive Q1 2009. Our customers are succumbing to the downturn and we've cut back to minimal hours just to minimize the burn rate. I am pretty sure I can go get another job in...
  12. fitek

    Ecrazyman controller with Kollmorgen?

    Additional note. The hall wires were damaged 2 more times subsequent to my post. I decided I ought to put a cover plate over the motor. I took the original and tried to use my acetylene torch to remove the epoxy. It kind of works but it smells terrible and takes a long time. So I switched...
  13. fitek

    simple upgrade for cheap forks

    Where'd you get the pocket bike steering damper?
  14. fitek

    diy brushless controller designs, a compilation

    Nice list... unfortunately it's so long I can't even begin to dig through it all!
  15. fitek

    Feasibility of Making your Own Fork?

    With all the recent threads on front hubs destroying drop outs, I'm wondering about the feasibility of rolling your own fork. There is a fork building instructable on instructables.com. But what about suspension forks? Springs are easy enough to find on McMaster... but what about shock...
  16. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    Ok, I think will.
  17. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    You need the hall sensors because it makes the logic for commutation easier. To make a 3 phase motor spin, you have to apply voltage to one or two of the phases in a particular order depending on the position of the motor. You can store this ordering easily in an array in a microcontroller's...
  18. fitek

    Mini velo

    Count another vote for 20". That's 6" you can lose off the length of a normal bike while still having the same wheelbase. Also lower CG on a recumbent. With a suspension the ride is great too.
  19. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    Well one of the hall phases totally just up and died today. I'm going to swap Kollmorgens and see what happens. I hate hall wires.
  20. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    12ah vs 3 year old 40ah SLAs. Which were probably around 10ah in real capacity.
  21. fitek

    36V ecrazyman running slower than 24v (well, not anymore!)

    I replaced the 24v SLAs on my bike with 36v of Makitas. My top speed has dropped from 21mph to 18.5mph. The bike will accelerate very slowly after 17mph and then "bump" up against the top speed with a frequency of 1 or 2 Hz. I'm pretty sure I got the hall sensors right, but you never know...
  22. fitek

    15A Home Depot light switch on ebike

    I've been using a 15A light switch to connect my batteries up to the controller. It worked for a couple of months but then one day the bike wouldn't go. I tested the switch with a DMM and it's toast. Current limit on the bike is 28a and I don't ride around at full throttle so I figured 15a...
  23. fitek

    Can Makita LXT fast charger charge multiple cells at once?

    Thanks DoctorBass. I think I will open up a couple of the working batteries and solder wires to them. I guess that is also helpful because I won't have to carry an extra shell around. I don't have much cargo space. I have ridden the bike 43 miles in the past couple weeks, charging is such...
  24. fitek

    Can Makita LXT fast charger charge multiple cells at once?

    I wired one of Jonathan's shells up to a pack that is 4 18v LXTs in parallel. I just soldered a wire to the each of the terminals on the PCB in the shell. However the charger flashes that the battery is bad after about two minutes. Do I need to somehow disable the BMS board to get this to work?
  25. fitek

    Can Makita LXT fast charger charge multiple cells at once?

    Ok, thanks guys. I will probably rewire my two larger battery blocks so all cells are in parallel. Then it will be easy to connect both in parallel to the charger and in series on the bike. Does anyone have a dead LXT shell that can be plugged into the charger?
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