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  1. 2

    Li Ion Battery tester

    Are you talking about individual cells, a battery pack? How do you charge them?
  2. 2

    18650 Power Supply

    To second the above, plenty of offers in the area, particularly cheap ones, are absolute trash. If you can, pick tested choices. I just got a new Lenovo laptop, requiring 50% more power than my previous Asus. The powerbank I mentioned above charged the Thinkpad from 0 to 100% in about 1h and...
  3. 2

    18650 Power Supply

    I have been through different banks and the my main one now for travel is QD188. It is somewhat crummy, challenging to figure out and expensive, but it is rugged and delivers any voltage you want It powers my laptops, USB equipment etc. https://www.amazon.com/dp/B01EK2MDTY/?tag=cpf0b6-20...
  4. 2

    Axa Pico 30 dynamo front lamp

    One of the common problems with circuits is that the water gets in leaving sediments that short the circuit. You can try to wash the circuitry in distilled water, rubbing it with a brush. Dry out the circuit and test it with a 6V source that can be DC, in place of the dynamo. Once you...
  5. 2

    Magnic Light: contactless bicycle dynamo light

    How naively I thought that the world was a bit more complicated than this...
  6. 2

    New Power Source

    There had been geared plastic dynamo contraptions in the past, including a few mounted over the rear axle. Hmm..., they lacked efficiency, durability and lasting power in the market, for those over the rear axle.
  7. 2

    Turn signal Bike Gloves... good? bad? other?

    From late fall until early spring I ride with reflective straps around my sleeves. I even have loops on my sleeves to keep the straps in place. When I have the choice of simple effective no-maintenance solution, I generally go with the simple. In my observations of pedestrians in the evening...
  8. 2

    Power switches for bike lights

    Also Judco here as the standard.
  9. 2

    Velogical rim dyno or IQ Premium/ Edelux II light seen yet?

    You can run off the rim any bottle dynamo with a sufficiently soft roller. The operation is smooth then, noiseless. However, for a reliability during rain you need a ribbed roller on a hard side pressing against a ribbed dynamo track on the tire. There had been some dynamos where you were...
  10. 2

    Velogical rim dyno or IQ Premium/ Edelux II light seen yet?

    Dynamos running off rim operate smoothly in fair weather but, as a rule, quit functioning when the rim is wet.
  11. 2

    New B&M lights coming in November

    The essential part is the forward prism that supposedly adjusts the pattern to the riding situation.
  12. 2

    Magnic Light: contactless bicycle dynamo light

    I did not believe in the sufficient strength of Eddy effect either and was wrong. I wonder, thought, about the long-term future of Magnic Light, after the novelty aspect wears off. It has to be expensive, because the strong magnets are needed. It cannot be as efficient as hub dynamos - in my...
  13. 2

    Magnic Light: contactless bicycle dynamo light

    I could not get a rotation of the rotor with a spinning steel rim either. I.e. occasionally I got half a rotation, but it was as often in the direction of the rim's spin, as against.
  14. 2

    Magnic Light: contactless bicycle dynamo light

    Martin: quick testing trying to rotate a steel rim, using a round magnet on a Dremel tool, produced a very vigorous rotation. Even if nonuniformity in the ferromagnetic properties were required, there is no problem with it being there. The rim is not perfectly true and, in addition, the strong...
  15. 2

    Magnic Light: contactless bicycle dynamo light

    Martin, I was planning to try out the steel rim tonight, but have now a major panic at my job. Come to think of it, a uniform ferromagnetic can only work through hysterisis and the nonuniformity in the ferromagnetic properties should be essential in providing the jolt to the rotor. The Eddy...
  16. 2

    Magnic Light: contactless bicycle dynamo light

    Martin: I tried to measure the effect of ferromagnetic spokes and it turned out that the effect, though noticeable when the magnet passes by the rim in the vicinity of a spoke, is not that great on the average - about 10%. For the measurement I went back to the diametrically magnetized round...
  17. 2

    Magnic Light: contactless bicycle dynamo light

    Martin, the lack of flicker is not an evidence for the lack of contribution from the joint, if your rotor is not providing much resistance. As an example consider a standard bottle dynamo working off a wet bicycle rim. If the terminals of the dynamo are open, the roller will usually rotate...
  18. 2

    Magnic Light: contactless bicycle dynamo light

    Martin: Did you check that your nipples, eyelets and spokes are not ferromagnetic? These can deliver power relatively uniformly on account of the ferromagnetic effect. Otherwise, I continued experimentation producing more numbers and the main is the partition: When using a Magnic type...
  19. 2

    Magnic Light: contactless bicycle dynamo light

    OK, I've done the belated experimentation of my own and admit that the Eddy effect can indeed contribute a usable power. To speed up my experimentation I reversed the problem and mounted a diametrically magnetized disk magnet onto a variable speed Dremel tool and approached with that tool...
  20. 2

    Magnic Light: contactless bicycle dynamo light

    The published setup is consistent with the expectations in the posts here - few of us actually tried out a rotating magnet. Otherwise your parts represent pretty much what I have now. As to the orientation of the poles, if Magnic were to work on Eddy currents, then the uniform NNNNNN...
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