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  1. R

    Converting a carbon fiber THYS 209 Rowing Bike to Electric

    That is really cool that the logged data shows the CA3 can produce perfect alternation of human and electric motor power to maintain essentially constant speed. I am guessing that you didn't anticipate this particular application when you designed the CA3. The dip in the current that can be...
  2. R

    Converting a carbon fiber THYS 209 Rowing Bike to Electric

    Extraordinary, great to see the detail of the rowbike conversion. Seems like a really good use of ebike technology. Returning briefly to the "string", I was really surprised to find out that the material is Ultra High Molecular Weight Polyethylene. I was expecting something much more exotic...
  3. R

    Converting a carbon fiber THYS 209 Rowing Bike to Electric

    Very interesting bike. That must be some kind of "string" that transmits the combined power of the riders legs and arms to the rear wheel.
  4. R

    my 18650 frame pack build

    Very nice pack build. You do such meticulous work.
  5. R

    BBSHD Takes on the Luiz Fire Road

    Nice video, great ride location. Thanks for sharing. Interesting that the BBSHD handles the sustained climb with no problem. Obviously that is not your A2B, what's the ride?
  6. R

    eBike Master Switch Design

    Measured the voltage between the gate and source for the 4110 FETs when the control power is "off" which is the condition where my build of the board has a voltage oscillation at the output. Under these conditions the voltage between the gate and source for all 4 main FETS seemed to oscillate...
  7. R

    eBike Master Switch Design

    Thanks for the diagnostic. I will give it a try. Carefully. Rich
  8. R

    eBike Master Switch Design

    It is certainly possible that I damaged something while soldering things in place. I initially had trouble with the 4110 fets because of my underpowered soldering iron, maybe I damaged one or more of them? Rich
  9. R

    eBike Master Switch Design

    Used the meter with locked ranged and observed voltage at the controller. Turns out the voltage changes are sufficiently slow and small enough in magnitude that the bargraph probably wasn't necessary. With control voltage on, voltage at the controller is about 70 v. With control off, voltage...
  10. R

    eBike Master Switch Design

    I have a Fluke 117 which although I have never paid attention, I think has a bargraph which is supposed to respond relatively rapidly to voltage changes. So if I just monitor voltage at the connection to the controller using the Fluke 117, it should yield the kind data that could be helpful? Rich
  11. R

    eBike Master Switch Design

    I changed R3 to 3.3K as suggested to address the shut-off issue that resulted in periodic flashing of the Cycle Analyst screen after turning off the master switch. Before changing R3, I counted the number of screen flashes over 10 secs and determined that after turning off the master switch...
  12. R

    eBike Master Switch Design

    Here is an image of the v1.1 board in a Hammond 1551K box
  13. R

    eBike Master Switch Design

    For all components, I tried to use what was specified by the BOM. It is of course possible that I didn't understand something. So I have listed the BOM below followed by the parts I used. If anything isn't clear, I can include the Mouser part number. R1,R2 1M - 1 Mohm metal film resistor, 1%...
  14. R

    eBike Master Switch Design

    I used 4 x IRFB4110 main FETs. On my bike I rarely exceed 2 kw, so I am not anticipating any heating problems for the switch. Rich
  15. R

    eBike Master Switch Design

    Update on using the Hammond 1551K enclosure. The board easily fits. I have not been able to locally find the #2 self taping screws to mount the board in the box (they are not supplied with the enclosure). One issue for the box will probably concern the leads to the battery and controller. I...
  16. R

    eBike Master Switch Design

    I have completed the 2nd beta version (v1.1) of the master switch board. As I am in the US it was no problem to get parts from Mouser. My bike has an 18S battery and I choose a 1 uF MLCC leaded, 100V TDK capacitor rather than using SMT caps. As the board has few parts, is can be assembled in...
  17. R

    CroBorg Super Commuter

    Alan, Good to hear that you are back riding and that that the upgraded gear has worked out well. We have had a bunch of below freezing weather in Portland which has limited my riding, I give up on riding when water is frozen. 2 wheels are already meta stable and ice upsets the situation. But...
  18. R

    eBike Master Switch Design

    Alan, I PM'd earlier about my interest in building a test board. In the interest of full disclosure, I am a totally novice electronics builder. I am a molecular biologist, with no electronics background. I don't have the parts required for the board except for the 4110 MOSFETS, which I do...
  19. R

    The Duty Cycle AWD

    Looking forward to the actual installation and learning more about this mid-drive. Could be very cool. Rich
  20. R

    The Duty Cycle AWD

    Well as you suggest that it is quite a tease. 3000 watts, continuous without letting out the magic smoke? More importantly, how will it be mounted? All very interesting, especially in view of the quality of your builds. Rich
  21. R

    HK 8000mAh Lifepo4 packs

    I have not used these LiFeP04 packs, but I have used other HK LiFeP04 packs. I found that when used at 4 - 5 C continuous, the packs swelled badly and I replaced them. I now use HK LiFeP04 at about 2 C continuous, certainly not more than 3 C and they seem to be OK. So I suspect that the big 8...
  22. R

    RFID Keyswitch

    Back a few posts you asked about interest in a through-hole version of the board that individuals could build. I am very interested. It would be a great addition to an ebike. Rich
  23. R

    CroBorg Super Commuter

    For somewhat different reasons, I wear high top, insulated hiking boots during the winter. This is mainly to reduce cold feet and the high tops extend up inside rain pants blocking entry of water into the boots. But they also offer a lot of support and considerable foot protection. That said...
  24. R

    New project with a special bike

    That's a rather special and unique bike. Others may disagree, but I wouldn't screw it up by converting to an ebike. Get a much less expensive bike for conversion to an ebike. Best wishes. Rich
  25. R

    CroBorg Super Commuter

    Ouch, sorry to hear about the fall. A couple of weeks ago, riding in the rain, I took a hard fall and I am still taking ibuprofen. Usually my bike seems so stable, even in the wet, but when things go bad, stuff can happen so fast. I was going down hill around a sharp corner on my usual...
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