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  1. fitek

    Getting back into ebiking and my packs are dead

    After a very long hiatus and the acquisition of a Shimano EP8 powered class 1 eMTB, I dusted off my 72v folding ebike and the Makita based battery pack is pretty well spent. It has the Shenzen Sucteam controller that was hot stuff on this forum... a decade or more ago. I used Makitas for the...
  2. fitek

    Lots of drag on a direct drive rear hub motor

    I tried to resurrect an Eton Eco folding ebike I bought off Craigslist a decade ago. Battery is toast but I ran it off a bench supply @24v w/ the original pedal first controller. The bike has a direct drive rear hub motor-- massive copper monster. I tried spinning the wheel by hand and it...
  3. fitek

    BMX left hand drive

    I have a brushless RC motor which I setup for no.25 drive on a scooter, but the first time I took it out, I broke the fork. I also happen to have a no.25 sprocket which I machined onto a 16t freewheel many years ago (I made it not freewheel anymore). I noticed my 24" bmx bike has threads on...
  4. fitek

    H-Bridge schematic?

    Been busy with family stuff, but starting to get back into my pre-kid hobbies. I'm looking for a schematic for an H-Bridge power circuit for motor control. Figured you guys might be able to point the way. Eagle files would make it even sweeter, but I can make those on my own :) If I...
  5. fitek

    Need a 36v or 72v 3 phase motor controller

    I need a decent motor controller for some tinkering; I'll be tearing it apart. It shouldn't be a POS but at the same time, I don't want to cry because I've killed a $150 motor controller. I got a couple of BMSBattery controllers three or four years back that are OK but shipping was SLOOOOOW...
  6. fitek

    Ebikes at Maker Faire Bay Area 2014

    I only had 4 hours at the show today (didn't exhibit this year) but only spotted half a dozen e-bikes and none of the regulars. But the booths were scattered all over this year and it was extremely commercial as well-- are small makers just passing on Maker Faire now? Will post pics in the...
  7. fitek

    XC846 based ebike controller?

    I'm looking for an XC846 based ebike controller (preferably sensored) but its been a few years since I even logged into ES and I'm not sure which vendors use these anymore. I modded one 3-4 years ago from Ecrazyman, but I've blown one of the phases and it keeps blowing again and again... so I'd...
  8. fitek

    Sony Konions from Makita Packs as Laptop Batteries?

    I have 2 Makita packs that wont charge anymore. I have a Thinkpad which runs for 30 minutes on its battery. This is the third battery. The replacements all use crappy cells. Pack voltage is 14.8v-- I assume 4s2p. Any issue with using cells from the Makitas?
  9. fitek

    Visiting Hong Kong...

    Hi folks, I'm going to have two separate 1 day layovers in Hong Kong on my way to & from India in February. Anyone have any tips on what to check out, primarily in terms of ebikes, while there? Of course, non e-bike advice would be cool to (but off-topic for this forum, heh). I will not be...
  10. fitek

    RC Motor faces "bolt pattern"

    Hey folks, just wondering how much similarity there is between the "bolt pattern" on faces of RC motors? I had a mount machined for my Hyperion RC motor that has been working great, and I was thinking of having a few more made during the holidays but I would probably get some of the HobbyKing...
  11. fitek

    Kit legality in Europe?

    Was wondering whether Europeans are able to "beat" the rather measly legal power and speed limits in the EU by ordering kits instead of complete bikes and then assembling on their own? And/Or do folks buy powerful bikes for "offroad" use and then just use them onroad? Or are y'all just being...
  12. fitek

    Problem with ECityPower/BMSBattery 12 FET controller

    Hi folks, I've been using the 12 FET BMSBattery controller (the one w/out cruise control) for a while. However, I swapped it out of the bike it was on to test a motor, and now I can't get anything out of it. There's the normal "pop" when I attach the andersens. I get 5V on the hall power...
  13. fitek

    Downtube with Ridiculous Battery Pack

    E-S member Ryan brought his 5305 powered bike over to troubleshoot the motor. We pulled it open and the insulation is gone off one area of windings. So we slapped his 72v20ah of batteries onto my Downtube. It was a little unbalanced with all that weight on the rear rack. To their credit...
  14. fitek

    Ecrazyman Hall Sensor Connector

    Sorry if this has been answered elsewhere. Tried a couple quick searches and didn't find what I was looking for. Anyone know what the Ecrazyman (and BMSBattery) hall sensor connector is called? Where can I buy both ends? Up until now, I've been cutting the connectors off and replacing with...
  15. fitek

    Change Infineon XC846 controller from sensorless to sensored

    I have one 6 FET Infineon based controller that is sensorless. It keeps blowing up. I have a dead sensored version of this controller and the board is very similar. Wondering if I just hook up hall wires to the hall pads, will it just use those? I assume no and either the software on the...
  16. fitek

    Hyperion RC Motor Hall Sensor Mounting

    Starting a thread about this. I bought a Hyperion RC motor and was planning on using it with a sensorless ebike controller, but they've all blown up before I had a chance to try them out. So I bought some SS411A hall sensors. Will attempt to mount them tonight. Will report back on success...
  17. fitek

    Adding hall sensors-- circuit questions

    Gonna try adding hall sensors to an RC motor. I found in another thread someone had used Honeywell SS411A bipolar hall effect sensors, available for $1.95 from Newark and Mouser. What additional components are necessary to interface with an ecrazyman sensored controller?
  18. fitek

    Blew out sensorless ctrlr again-- what's reliable?

    Give me 10 minutes and I can kill these 36v ecrazyman things pretty easily. I'm rather tired of swapping out FETs SOOooo... Anything sensorless with a bit more longevity out of the box? (that doesn't cost like 5x as much) I'm using a Bafang hub motor.
  19. fitek

    Clearance problems with freewheel attached to 3spd hub

    I bought one of the 3 speed Sturmey Archer wheels from UtahTrikes and made an adapter to fit a freewheel and a #219 sprocket onto the wheel. Basically, there are just 3 holes drilled in the stock sprocket and the adapter has 3 holes too. They get bolted together. Trouble is, the height of...
  20. fitek

    IR2101 hi/lo side driver discontinued?

    I just got a notice from Newark that the IR2101 hi/lo side driver is on closeout. Seems to be hard to find elsewhere. Digikey has 297 of the DIP package in stock and the rest are non-stock. I used these extensively in my motor controller and some other circuits, so just a heads up :)...
  21. fitek

    Help me understand the theory of charging

    I'm trying to make sense of how to run numbers for battery charging and what effect charging voltage has. My observations are that as I increase the voltage of a power supply attached to the pack above the pack voltage, the current that goes into the batteries increases. Of course according to...
  22. fitek

    Compact Tandem v2.6

    I've shown off the previous version of this bike at a couple of shows (Maker Faire and Google I/O Conference) and. It has three problems that bug me: 1) with a passenger on the back, there is a wobble in the steering at low speed, probably because the passenger's CG is at or behind the rear...
  23. fitek

    Hub motor makes squealing noise after reassembly

    I took apart a direct drive hub motor and put it back together again. Now when I spin it, it squeals like a tire on painted concrete. I had to use some elbow grease to get it back together so I wonder if its mis aligned or whether I screwed up a bearing? I took the cover plates off both...
  24. fitek

    Lacing Bafang hub motor

    Hey folks, I got a Bafang front hub motor and would like to lace it in a 20" wheel. The trouble is I have never laced up a wheel or had it done for me. If anyone knows a place where I can get it done for a reasonable price in the SF Bay Area let me know. If it is ridiculously easy I'd try...
  25. fitek

    Blew controller by hooking battery up backwards

    Hey folks, I ordered a bafang and two controllers from ecrazyman and promptly blew one up by attaching the batteries backwards. Stupid farking connectors... I chopped every single one off since finding matching connectors is impossible and of course while I was playing with the hall wires I...
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