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  1. fizzit

    Simple cutoff circuit for using a CC/CV supply as a charger

    Yeah, that should work! The only potential issue issue is that the input sensitivity of the LM324 could be too low to detect low currents across such a low resistance shunt. The typical input offset voltage of the LM324 is 2mV, which would correspond to 2A across your shunt. It's worth a shot...
  2. fizzit

    Simple cutoff circuit for using a CC/CV supply as a charger

    I have a couple CC/CV PSUs that I use to charge my bike battery, and it's always been a bit annoying to have to remember to unplug the charger to keep the batteries from trickle charging once they’re full. I recently came up with this little analog parts-bin circuit that detects when the...
  3. fizzit

    [Sold] 12x Turnigy 4S 5000mAh 20C Hardcase Packs - $250 - Seattle, USA

    Glad to hear, best of luck building your pack!
  4. fizzit

    [Sold] 12x Turnigy 4S 5000mAh 20C Hardcase Packs - $250 - Seattle, USA

    Selling my 12 Turnigy 4S 5000mAh packs. These were purchased in March 2022 and have about 50 full cycles on em, used as a 16S 3P eBike pack. They’ve never been charged over 4.2V or discharged below 3.6V, and they’ve been kept between 3.8V-4.15V for the vast majority of their life. These are in...
  5. fizzit

    SOLD Cyclone Coaxial 2-6kW Mid-motor + Controller + Frame $200

    Looks like it'll be about $130 to ship it to Dallas with Fedex or UPS ground. Edit: Just saw your question. I never noticed the motor get warm with street riding mostly in the 20-30mph range.
  6. fizzit

    SOLD Cyclone Coaxial 2-6kW Mid-motor + Controller + Frame $200

    I'll try to weigh it and figure out what size box it would fit in and get back to you this weekend!
  7. fizzit

    SOLD Cyclone Coaxial 2-6kW Mid-motor + Controller + Frame $200

    Bumping, price now $200. Apologies for the late reply. I haven’t spent a long time riding over 35mph so I couldn’t tell you. This is the straight headtube frame.
  8. fizzit

    Innotrace X1 Controller.

    I’m using the same motor and frame with all throttle, no pedal assist, and I get around 30wh/mile. My riding is all on the street so we can’t really compare directly, but I think your battery is way overrated. If you were really using 100wh/mile I think your motor would have fried by now...
  9. fizzit

    SOLD Cyclone Coaxial 2-6kW Mid-motor + Controller + Frame $200

    I’m selling because I decided to build something a little lighter, smaller and slower. This bike really shines at speeds over 25MPH, it can handle 35MPH without breaking a sweat. But most of my riding is on trails now so I rarely find myself going that fast.
  10. fizzit

    SOLD Cyclone Coaxial 2-6kW Mid-motor + Controller + Frame $200

    I'm selling my Cyclone Coaxial mid-drive motor kit, with frame, motor, 60A 36-72V controller, and DNM rear shock. It has less than 1k miles of only on-road riding, and rides and runs as well as the day I got it. I'm located in Seattle and I prefer local pickup but would be open to shipping...
  11. fizzit

    PNW "EVADER" EV10000 ev-1000 bike is missing part / history

    I have one of these in storage with dead batteries. I can take photos next time I pull it out.
  12. fizzit

    Farfles Electric Ultralight.

    That's horrible news. Jackson is the only person I've met from the sphere in real life, back in 2012 when I visited the electric bike shop he worked at in Bend. I remember how nice of a guy he was and how he was happy to stop working to show me, a random stranger from the internet, his projects...
  13. fizzit

    How good is Cyclone 4kw coaxial suspension bike?

    Well that's concerning, sounds like a hard earned lesson. Those are the motor phase connections, I have pretty much all the other connectors waterproofed. Was the water in the throttle connection in your case?
  14. fizzit

    How good is Cyclone 4kw coaxial suspension bike?

    I hadn't heard of that chain before. I'll have to check it out, I'm already on my second chain at 500 miles. Here's how my bike is looking these days: I switched to mudhugger fenders, the old ones really weren't cutting it for the downpours we were having a couple months ago. I added a 9V...
  15. fizzit

    We ordered a 2020 Mini Cooper electric!

    Cool video, great to have some real world testing data out there. In my experience with the spark, speed makes a larger difference in range than weather, I'm betting even more so for the mini since it has a heat pump. It's an especially large factor for small cars, where aerodynamic drag has...
  16. fizzit

    USB-PD Charger

    I was inspired by your idea and decided to make my own for charging at work. I wanted it to be a bit smaller than the high-wattage boost converters on eBay so I made my own boost converter on a strip board with an LTC1624 as the driver, and a ZY12PDN USB PD adapter to negotiate 20V. I had to do...
  17. fizzit

    We ordered a 2020 Mini Cooper electric!

    I really like the look of this car, right now I'm driving a Spark EV and it's fun but it's a bit of a cheap car. The Mini site says they're running low on stock and orders won't be shipping until summer... Did it say that when you ordered yours?
  18. fizzit

    How good is Cyclone 4kw coaxial suspension bike?

    Yeah it's pretty frustrating, it's the most expensive thing I've gotten through USPS and they completely lost it. I opened a missing mail case, I tried to open a claim but the inquiry page says the tracking number is invalid. It works fine when I use it to track the package. Hopefully Paco was...
  19. fizzit

    RPM-Based Current Throttle

    I threw it on the bike last weekend and its actually working pretty well. Makes things way more manageable and I don't feel like I need to keep a death grip on the bars any more. Here's what I posted in the coaxial thread: Absolutely, unfortunately I don't have a picture (the microcontroller...
  20. fizzit

    How good is Cyclone 4kw coaxial suspension bike?

    Paco re-shipped it. He said something has changed and in the last couple months USPS lost 40% of his shipments. On the tracking it still shows that it arrived in San Francisco and is stuck. Might be able to get some money from USPS but I think he didn't get insurance so the max payout is $200...
  21. fizzit

    How good is Cyclone 4kw coaxial suspension bike?

    After a 2 month shipping delay caused by USPS losing my first kit, I finally received my Elite frame and coaxial motor at the end of October, built the bike at the beginning of November and started riding it 2 weeks ago. I've put about 50 miles on it and its been quite fun with no major issues...
  22. fizzit

    RPM-Based Current Throttle

    Cool, that does look like what I was thinking. I built a little protoboard to test it out using an MCU that I had lying around. Unfortunately the signal from the hall sensor is extremely noisy, so the RPM measurement jumps around a lot, even with an RC filter on the MCU input. I borrowed an...
  23. fizzit

    RPM-Based Current Throttle

    Has anyone tried to implement a current-control throttle that works without current sense feedback, by just measuring the RPM of the motor? This seems like it would be easier to implement and more responsive than the current-control throttles that use current feedback in a PID loop. This should...
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