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  1. pguk

    Baserunner V4 Z9 only works when connected to a computer

    I have today developed this issue on my Baserunner which has been in service without hiccup for about 4 years. This morning I was out in the rain and lost power at the bottom of a fast hill. Back at home, the controller spins the motor when the TTL (trrs) cable is plugged into the computer; when...
  2. pguk

    Cycle Analyst - still solid choice?

    I noticed the CAv3 has regen upgrades lately. I have a 3kw moped (NIU NGK) which has partial regen. I am trying to research how best to get full variable regen. Would the CA3 be able to be used for this? In his late video on regen at the bike show, Justin name checks Kelly controllers. I was...
  3. pguk

    MAC motor + Trek 4300 build

    I just nipped out back to check - yep, this is a 200mm disc I ran on a MAC a few years back. The Kona Stab frame had no disc mount bracket so I added one with aluminium welding. Would recommend a 203mm rotor, but 200mm was what I had to hand and it did run well :) Great to hear the motor is...
  4. pguk

    Your Creation's Before & After Pics

    [Neo: hmm, Upgrades...] 8) My Azub Six SWB ‘bent commuter ride gets treated to an upgrade :bolt: I came across this bike on Ebay a few years back. I had wanted to try a 'bent for years and this one was barely used- seller was asking basically double the price of the Rohloff alone for the...
  5. pguk

    XPD: open-source keywin e-bike lab replacement

    Having trouble installing this - I'm on Windows 7 I followed the instructions for installation in first post as far as: "d) you will see two icons: the XPD program and the XPD icon." I don't see any icon - not either one. I do have the 10 folders: 0.1.0 0.2.0 0.2.1 ... 0.4.1 support ??? :)...
  6. pguk

    Scratch Built - Stealth Fighter Style Bike

    Hi Storapa, Lovely build you have here - please tell us you finished it?? I know it’s always the last ‘small’ jobs in a project which can take the most time...
  7. pguk

    Any guitarists/ pianists here ?

    I play guitar. Parents sent me to piano lessons when I was a boy - I gave it up as soon as I could but not before I got a good understanding of music theory, enough to teach myself guitar. I'm 44 now. Just last year I finally could play a country rock riff on the telecaster which I been...
  8. pguk

    A2b metro gti

    I nearly bought an a2b off eBay last month as they were at a greatly reduced price for some reason. Interesting to see the battery, 60 cells; I run 80 cells on my raleigh twenty, more than enough for my 36 mile commute. Looking forward to seeing where you go with this.
  9. pguk

    JP spot-welder, FET-switched, timed adj. pulse

    Hi folks, I found time over Christmas to do a layout on kicad for the power board. Tesseract should be happy - I got the shcottky and the TVS diodes all on the board. TVS's sit above the surface mount FETs. I finally gave it a proper run at the weekend and it seems to be working as it should...
  10. pguk

    build your very own Lebowski controller !

    I could use my Cycle Analyst, sure. Set max speed/current. You're still hanging onto the throttle all the time tho' - a pushbutton solution would be best IMO. Some thoughts about coding (thinking aloud): Unless push button pressed, output follows input. When push button pressed: 1. Log speed...
  11. pguk

    build your very own Lebowski controller !

    On the back of this torque vs speed control, what do folks think about cruise control? For high power trail bike, obviously not required, but for a low power commuter I think I'll miss the ability to lock in at a certain speed at the push of a button and sit there till the next red light. For a...
  12. pguk

    LWB recumbent mid-drive (RC brushless?)

    How is this coming along? I wonder if you found the Mac mid drive conversion thread on here? The Mac is a robust motor, electrically difficult to drive - lebowski has managed to run it with his controller. Could be a solution for you?
  13. pguk

    My recumbent cargo bike

    This interests me greatly - that it's possible to take hands off the steering. I've had a SWB Azub 6 for over a year now which is the first and only recumbent I've ever riden. In no way is it possible to let go of the bars for any length of time as balance fails very quickly. So you are...
  14. pguk

    Server power supplies in series!

    Been reading up on this topic today, came across this instructable to convert a PC smps to make an adjustable supply: http://www.instructables.com/id/Adjustable-High-Current-Lab-SMPS-Out-of-a-Standard/?ALLSTEPS Apparently this hack is very common as they have a dedicated page listing over 70...
  15. pguk

    DIY Arduino timed spot-welder, FET-switched, adj. pulse

    I've been working on this circuit for this past year or so - been through a couple of revisions and learned quite a bit along the way. A couple of suggestions for improvements of this unit: 1) From the schematics on instructables there doesn't seem to be any gate resistors for the FETS. Riba...
  16. pguk

    JP spot-welder, FET-switched, timed adj. pulse

    Ah yes I just had a look at the schematic for your unit - power board and control are indeed separate modules. Looks like he has one .1u ceramic and one 1uf electrolytic for power rail decoupling? Decoupling capacitors decouple any noise or dip that might appear on the power supply line ie 5v...
  17. pguk

    JP spot-welder, FET-switched, timed adj. pulse

    Sounds like perhaps your power rail is seeing a dip on weld fire? Does the board have enough decoupling capacitance? I've been reworking my unit today to include a 1uf smd PET film capacitor. This has much better ESR than the electrolytics I've been using so far and is what is spec'd on the...
  18. pguk

    build your very own Lebowski controller !

    :P that was easy, it was late last night.. running out of superlatives here, thanks again.
  19. pguk

    build your very own Lebowski controller !

    Next question.. So I now have the power supplies nice and tight, 15.5V and 5.2V. This afternoon I put the last of my components on the board, then I put in the 30F4011, powered up and saw the drive 0 led lit. It lives, great! Next I put a toggle switch on the setup and reset jumpers, connected...
  20. pguk

    build your very own Lebowski controller !

    Ahh, Cracking! I didn't look since yesterday - was busy re-reading the thread. Yes I did program the 12F myself. It was my first time programming a PIC. I run Ubuntu on an old dell machine, I found a program called pk2cmd which drives the Pickit2 in a terminal. It did take me a bit of time to...
  21. pguk

    build your very own Lebowski controller !

    I have the power supplies set up on 14s (49.9V atm). They look good but they're only running an LED - maybe they will fail at bottom of charge and with the load of the FET drivers ? Could you give an idea how to modify your code to change the pulse width of the 4115 / 4110 for low voltage...
  22. pguk

    JP spot-welder, FET-switched, timed adj. pulse

    It took me a while for the penny to drop re my understanding of avalanche. Your explanation is well taken. That flat top of the blue & orange traces is when the voltage goes no higher *because* current is finally forced through the FET. I had hoped to avoid extra components by using devices...
  23. pguk

    18650 spot welding -how to- ULTIMATE REPOSITORY

    As regards paths of resistance, I can see that there are differences due to different lengths of nickel which each cell has to push current through. But if we think about what happens to a parallel cell block at discharge - voltage across all cells has to be equal all the time. So if, as you...
  24. pguk

    JP spot-welder, FET-switched, timed adj. pulse

    Arlo, you are as tactful as a brick! I reckon the 2 diode solution which okashira has documented is good enough for most of us. I do have questions in my own mind about the advantage of using a Schottky over a home brew FET body diode (forward voltage of schottky's so far mentioned seem as high...
  25. pguk

    JP spot-welder, FET-switched, timed adj. pulse

    I updated my post on previous page with a scope shot of TVS diode added along with my homebrew freewheeler. Which Schottky have you used at $3? So this is a new idea. If I were to add a decoupling capacitor for the freewheeling diode, do you mean I should connect it in parrallel with the...
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