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  1. S

    crazy idea?

    bit of a crazy idea here not likely to be practicable I've been using some perspex windows in a fairing, and noticed when cleaning them that they attract dust on the inside of the perspex ( opposite side to that being cleaned), the static build up is very noticeable. I also remembering reading...
  2. S

    brett ebike.biz refunds

    I've been asked to put some statement on es forum on what my plans are to solve the supply problems, basically my plan is to refund anyone who has been waiting a rediculous amount of time for kits. I know its caused alot of people huge headaches and angst. What I'll do is refund those people...
  3. S

    inductors

    Been discussing inductors with reanimated residue, have been wondering for some time why the csiro solar car motor kit came with three inductors, seems as that motor has no iron core inductance is very low, and it needs external inductors ( why it needs them I have no idea). I have almost zero...
  4. S

    bmc motors

    just wondering if hipower or bettercycles could supply some pics of the internals of their motors? On hipower website your torque graph is for a motor made in 2005 ( bmc motors use serial numbers that have the year in them), and its 250watt rated as calculated from the data by the torque...
  5. S

    hipower bmc motor internals

    would anyone have pics of the internals of the bmc motors hipower are selling
  6. S

    gear change hub motor

    I never thought I would see one, 48v moped type hub motor with gear change via twist cable located on left throttle, 3 speed gearbox
  7. S

    bak a123

    just did a search for bak on es forum, not much talk about them. Seems they are still making cells, and 'apparently' were making the cells for a123 for use in dewault........
  8. S

    measuring back emf

    anyone know how to measure back emf using a multimeter ( if its at all possible), keen to see what values bmc 500watt motor will give while being used under load with different voltage supplies ( 48v upwards)
  9. S

    mosfet alternate type

    anyone come across any controllers using the alternative mosfet packages would be much easier for swapping fets
  10. S

    irfb4228

    just looking at irfb4228 as a 150v fet, a bit lower on resistance than the fdp2532 its listed as a pdp switch, does that mean not suitable to use in controllers?
  11. S

    balancing 24v lithium packs

    Has anyone come across any balancer units to suit 7 cells, seems there are a few balancers out there for rc batts, but are lower than 7 cells in series, I have quite a few edan cobalt oxide lithiums ( old cyclone stock) which are 24v 15ahr, I use them without bms boards, and balancing over long...
  12. S

    switching speed and resonators

    staring to notice the ceramic resonators on alot of controllers ( thanks fetcher of course and all the others for solving the critical frequency issue for higher rpm use) maybe is going to be useful way to tweak lots of different controllers for higher rpm use seems there are 3 pin ones with...
  13. S

    4110 fets

    Have been looking at different sources for irfb4110 fets seems there are three different versions ( probably from different factory locations: mexico/china) pics attached to show how to spot the difference, mexican factory made ones are the good ones, others made in china will have similar...
  14. S

    modified slingshot trike from 1970's

    have been chipping away at modifying an early recumbent, slingshot trike from usa , built some time in early 1970's. have used motorbike suspension, ride is very smooth and stable, tested up to 79km/hr using x5303 with v2 35amp controller, running on around 85volts ( lithium cobalt oxide 86volt...
  15. S

    Dual Speed Motor regen

    Have been using a gl-dual , dual speed motor regularly with a meter which shows amps used or amps created (analog type : needle swings) I think dual speed motors seem to have been forgotten about a little but I think they might become very useful when people start using supercaps to help store...
  16. S

    irfb4110 lead or no lead

    anyone have knowledge on any differences in reliability of 4110 fets, seems there is lead and no lead versions, is there any good reason for not going with lead version? apart from environmental side
  17. S

    led test meters controller/motor

    on testing hall sensors I have some test meters for motors and controllers which use leds to show results. on controllers will show if windings have continuity, and if hall sensors firing, shows order they fire in can use to tell if motor is 60/120 degree. on motors other meter will show if 5v...
  18. S

    mosfet irf4315 150v 40amp 0.042ohmn

    was just looking at a brushed high amp controller, has irf4315 fets, from data sheet seems they are 150v 40amp continuous ( 150amp pulsed ) 0.042 on resistance, haven't seen this one mentioned before, might be of interest to some fet junkies
  19. S

    no bms required

    ok i'll probably get shot down for this one, heres my low tech way of no bms for cobalt oxides. Leave cells exposed so can feel temp with hand, when riding or when charging. Bad cell will get hotter than surrounding cells. If there is a problem cell it will get hotter either when bike under load...
  20. S

    stopping overamp bms on lithiums

    learned today you can use a capacitor across pos and neg wire of lithium battery to stop overamping at start up and making bms board mosfets turn current off. cyclone 24v packs suitable cap is 50v 220uF
  21. S

    Beware of Spray Ebike Company china

    I have been selling ebike bits and pieces via http://www.users.bigpond.com/solarbbq/bikesale/bsale.htm for a number of years. I've just returned from a nightmare trip to china, my former workman ( Qihua Shen) and his father, mother and brother , have stolen most of my stock. They resorted to...
  22. S

    slope measuring

    not sure if this has come up before, probably has but simple spirit levels can be used to measure slope
  23. S

    60/120 degree continued

    just learned something interesting motors with internal structure like 408 motor all hall sensors face up = 60 degree, middle one face down makes 120 degree But motors with internal structure like gl-2, or bmc/puma are opposite way: 120degree has all hall sensors same way up, 60degree has middle...
  24. S

    a123

    a123 powered 'killer' cycle a good name for it: not sure if anyone has posted this video http://www.filecabi.net/video/killacycle_demo_crash.html
  25. S

    simple led circuit for lithiums

    messing with some leds to show battery voltage, turns out can be done very simply. I wanted something to give me an indication if a cell had gone bad. The packs I'm messing with are lithium cobalt oxide, 24v 15ahr used by cyclone company. Since they are 15ahr there are three cells in parallel (...
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