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  1. TheWizard

    Combine volt amp and Ah meter for USD $15

    Thanks for that picture. I finally got mine and took a closer look. The MCU is an STM8 and theres a TI 272c op-amp attached to it. http://www.st.com/internet/mcu/product/215113.jsp looks like I could use a versaloon board to program the chip using 4-pin SWIM (which might be what that...
  2. TheWizard

    Combine volt amp and Ah meter for USD $15

    Would anybody with one of these be so kind as to take a pic of the front-side of the logic board with the Atmel microcontroller(s)? I'm interested in reversing/reimplementing the firmware to make a poor man's CA for my spare-ebike that is not worthy of the genuine article. It'll be a few weeks...
  3. TheWizard

    Farfles Cargo bike

    I'm headed towards building a longjohn/bakfiets too after having motorized my xtracycle longtail (rode it for 5 years unmotorized). longjohns with tiny tank wheels and low-center loads beat wobbly longtails hands down. I have ridden an atlas, and the ride quality beats my average xtracycle, kona...
  4. TheWizard

    assembling a 80V/15A A123 charger from 75#s of telecom scrap

    Ok, I think I've finally figured these old supplies out and have a way to get them to charge my packs. (apologies for not filing this thread under the battery section in the first place) The mains go into a step-down center-tapped transformer to get 24vac and the isolation needed for...
  5. TheWizard

    assembling a 80V/15A A123 charger from 75#s of telecom scrap

    thanks guys. I did not read about columb counting in any of the charger+BMS designs I had looked through - the ones I saw monitored each cell and would shunt-resist current away from them once they approached HVC, and then kill-signal the charger once all cells were being shunted. I think...
  6. TheWizard

    assembling a 80V/15A A123 charger from 75#s of telecom scrap

    well shoot, I misread that label, I thought it said CVCC, not CVDC...now I have a boat anchor. I'm not sure how much the current will sag as it reaches voltage, but that defeats the whole purpose of building a monster like this. They came from Davis Salvage.
  7. TheWizard

    assembling a 80V/15A A123 charger from 75#s of telecom scrap

    Preface: Last week I salvaged a Chinese AOWA 36V pedal-elec. After stripping off the cheezy plastic panelling, I found a very solid bike that was fun to "drive" (the cranks are just above the ground and are 155mm long with a 1:1 gear ratio, making "riding" a bit of a joke) but the SLA batteries...
  8. TheWizard

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    I found this little blurb today about using an inkjet printer to lay masks directly to copperclad board so you can etch your own prototype PCBs http://www.instructables.com/id/Converting-an-Inkjet-Printer-to-Print-PCBs/?ALLSTEPS the v4.5 BMS has a hell load of through-hole drillings that one...
  9. TheWizard

    Dr.Bass Steveo found 7s3p Module! Awesome Price!!

    Ah, durr durr. Thanks oatnet. I knew parallel cells self-balance, but I thought measuring across a single battery's leads would get an isolated reading (path of least resistance?).
  10. TheWizard

    Dr.Bass Steveo found 7s3p Module! Awesome Price!!

    so I'm looking at how the packs are wired with 1 balance wire for each string of 3 parallel cells, with the corresponding circuity on the BMS boards. It makes me wonder how a pack can be considered "balanced" when the cells are only monitored in strings rather than individually. Did A123 measure...
  11. TheWizard

    Electric tricycle Master's thesis

    I found this thesis while I was looking for information on building a BMS/charger. I couldn't find any prior reference to it already on the forum, so here it is: The Development of an Electric Tricycle and Buck-Topology-Based Battery Pack Charger - Matthew John Taschner Its nice to have a build...
  12. TheWizard

    Dr.Bass Steveo found 7s3p Module! Awesome Price!!

    I ordered 3 7s3p's and just got them today. took about 5 days from Shenzen to Phoenix. the delivery man missed me at my house, so I went to the airport depot and picked em up myself. The box was 4 pieces of warped 5-ply and tack nails. had i not picked up the pack, it would have probably...
  13. TheWizard

    A123 AMP20M1HD-A Battery pack kit

    East German bulbs?! You definitely need to give that rig a good James Bond-style bad-guy superweapon name.
  14. TheWizard

    New crystalyte motor - G series

    I got one of these hubs bare to complete a sh*ts-n-giggles spare parts build. the axle is threaded with two different, but equally infuriating and inappropriate pitches, so DONT LOSE THE OEM NUTS left side: 9/16-20 RH (only used for bicycle pedal axles & cranks!) right/drive-side: 7/16-28 (only...
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