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  1. C

    home made e-bike frame. stealth fighter look a like

    A seperate 12V battery needs to be recharged as well and is unnecessary weight when the lights are off. You might consider installing a DC/DC converter.
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    home made e-bike frame. stealth fighter look a like

    My head tube has an inner diameter of 34mm. The headset fits into it nicely. I am not an bicycle expert, but this should be the normal size for mountainbikes. I also have headway cells. However 52 cells sound like a lot. Do you have space for all them? The weight of 19kg is also to consider.
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    home made e-bike frame. stealth fighter look a like

    Welding looks good. What thickness and dimensions have these tubes that you use? A head tube made of CrMo steel is often 1.5mm thick. My head tube has the same thickness.
  4. C

    home made e-bike frame. stealth fighter look a like

    You are very talented. It took me countless hours to build my frame. You seem to be pretty fast! It is not your first project, right?
  5. C

    Re: Street LEGAL Custom Bomber build! :-)

    Congratulations on your successful legalisation! I am building a similar bike with 2kW of power. My plan is to use a pedal sensor instead of a throttle and switch to 250W-mode when riding in the city. Changing to 2kW requres a special procedure. Even if you get pulled over by cops, you could...
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    home made e-bike frame. stealth fighter look a like

    I have a thread that I haven't updated for a long time: http://endless-sphere.com/forums/viewtopic.php?f=6&t=53234 As soon as I have the bike finished, I will post pictures etc... The fork comes from a downhill bike I bought for 600€. I am using several parts of it, as they are rigid and...
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    home made e-bike frame. stealth fighter look a like

    Hi, I'm building a frame that looks similar to yours: http://s1.directupload.net/images/140402/twhb9mnm.jpg I made my own swingarm. The swingarm of my downhillbike did not allow the suspension to be outside the frame. Check out this thread...
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    Custom Long Tail Build

    Really nice build! I wonder why this thread isn't so popular. I especially like that you built your own frame. Can you give me some aspects like the total weight of the frame, the material used, tubing timensions...
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    Re: Street LEGAL Custom Bomber build! :-)

    I congratulate you on having it street legal soon! Can you tell some more about the way they inspected the frame? Did you have to send it away for a stiffness test?
  10. C

    Re: Street LEGAL Custom Bomber build! :-)

    I always read on the internet that a registration of such a vehicle is impossible in Germany. If you succeed, you will become some kind of a hero. Many will follow you, including me :D
  11. C

    eBike Master Switch Design

    When looking at teklektik's chart, it all becomes clear to me. There's a constant value which tells you how much temperature above ambient is generated for one watt. R(OJA). The datasheet names it thermal resistance. So for every watt the MOSfets generates ( P = Id²*Rds(on) ) the MOSfet's...
  12. C

    eBike Master Switch Design

    So if I understood it correctly, the difficulty is to handle the heat and to have it all compact? This still doesn't sound too difficult to solve for me. Why isn't there a switch like this on the market? The cost should be low, one IRF4110 costs like 2€ or about $2. This thread seems to be...
  13. C

    eBike Master Switch Design

    What is so difficult about a MOSfet master switch? Your design puts the MOSfets horizontal to the board, why not put them vertically up with a proper heatsink attached? What are the other problems that make such a MOSfet master switch difficult to built?
  14. C

    eBike Master Switch Design

    Will you add a schematic of this board?
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    DIY Programmable BMS (now using ATtiny/Arduino)

    One cell module looks to be 25-30mm wide, right? So for a 16s, the BMS will be more than 40cm long and the mainboard will add even more. Do you plan to put it into a bicycle frame? Whats your plan
  16. C

    DIY Programmable BMS (now using ATtiny/Arduino)

    These are good news! Your 1.2V reference has a tollerance of 1%. Are you lucky that the one you soldered in was a very precise model or did you measure the exact voltage and copied it in your firmware? You said you oversampled it to 12-bit. Does it mean you just took several measurements in a...
  17. C

    DIY Programmable BMS (now using ATtiny/Arduino)

    Hi, it's nice to see that you are making progress. I have some questions to your circuit design: Why are you using a PNP-Transistor instead of a MOSfet? You included a Zener-diode in your design. Does it reduce voltage spikes induced by the cell? I cannot read the type of the 1.2V reference...
  18. C

    DIY Programmable BMS (now using ATtiny/Arduino)

    Hi, I am also designing a BMS with an attiny for each cell. Will you use your BMS for yourself? My idea is similar, although I have some different approaches. This is the schematic for one cell: As you see it includes an Attiny44 that you also mentioned. It has more output pins than I need...
  19. C

    Crystalyte with bent spokes

    Thanks for your kind help. I sent Crystalyte the picture of a bent spoke and they offered to send me a wrench tool to straighten the spokes. Another question: The rim is an exal Ex 19 which is good for tyres with a width of 28-62 mm according to the website...
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    Crystalyte with bent spokes

    Crystalyte-Europe offers the lacing on their homepage. I think many customers buy them laced. I'm pretty sure the rim is of good quality since they're made especially for ebikes. The spokes are heavy duty, 13Gauge or even 12Gauge. I sent Crystalyte an Email, let's see what they tell
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    Crystalyte with bent spokes

    Hi, I received the package from Crystalyte Europe today with my sensored HS 3540 laced into a 26" wheel. I was a bit disappointed when I saw the spokes. Some of them are bent as you can see. I can't imagine Crystalyte hasn't noticed the curved spokes. So is it a problem or not? with...
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    Johannes' custom ebike frame

    Thanks. I changed the design a bit. I still have a chain tensioner, so it is probably alright if I attach the BB to the frame. My frame is 90mm wide on the bottom, so I cannot weld the 73mm-long BB-shell right onto the frame. I have no better idea than to weld a 3mm sheet steel on the frame...
  23. C

    Johannes' custom ebike frame

    I see the picture of the Stealth Fighter. Can someone tell me please the diamater of the bolt that goes through the swingarm pivot?
  24. C

    Johannes' custom ebike frame

    Thanks Peter for your thoughts. You're right about the suspension. I didn't think too much about it. changed the upper part of the swingarm. The spring is now connected more towards the pivot point. I also sized up the bolt that goes trough the the bearings on the pivot point. I'm going to use...
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    Designing eBike frames

    I went to the bike shop and tried different mountainbikes. When you found a bike that is appropriate for you, you check the internet for frame dimensions. If these are not available, measure the wheelbase of the bike and take a picture of the bike from the sideview. Copy the image to Google...
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