Recent content by tspoon

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    Busch Müller Luxos hack question

    I had a Luxos U which would intermittantly show the same fault. It seemed to get worse in cooler, damper weather, making me suspect that dew was forming somewhere it shouldn't and causing problems. My light eventually failed completely. I was, at the time, pretty disappointed that a light...
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    Dynamo to 5V USB charger

    It's quite possible that even a 5W zener may not be enough, even though it should be. In 2016 I set up my own AC/DC conversion system, similar to your proposed setup, it was for a bike holiday. I had 2x5W diodes, mounted in series/opposite on the AC side. Then I started off on the holiday. On...
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    Car USB charger in parallel with switchable dyno hub light?

    Re: Car USB charger in parallel with switchable dyno hub light If only a dyno hub is connected, the electronic module possibly isn't necessary, as the hub is limited to around 500mA naturally and the voltage will adapt to that necessary (within reason) to push 500mA through the circuit. I used...
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    Any idea how they modified this dynamo?

    I can't click through to see the dynamo (I'm at work), but I would say at a guess it has been fitted with a bipolar electrolytic capacitor to alter the reactive impedance of the dynamo. Of course that assumes the dynamo is an AC output model. Better magnets would not alter the maximum current...
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    Optics: Reflectors, Collaminators, and lenses. Pro/cons please

    The best place I know to get them is SurplusShed.com (search for 'aspheric') They are round and have two parts to their specification, a diameter and a focal length. The focal length is the distance from the lens the light source has to be held to be 'in focus', i.e. sharply directed in a beam...
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    Optics: Reflectors, Collaminators, and lenses. Pro/cons please

    I've been using aspheric lenses for throw with some success. The only problem is that a 50mm lens has almost too narrow a beam. I have recently been experiment with 30mm and 17mm variants with slightly better results. These won't fit your housing easily though, and whatever size you use, you'll...
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    Dynamo LED Driver Circuit - PCB available

    Sorry I was struggling with system problems for a few days. Put me down for 1 x 3 Led version. I live in New Zealand. Cheers Martin. edit: hub version
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    Feeler: Driver Circuit for max LED Power from Hub Dynamo

    I'd be interested in having one as well. I've currently gone back to a 2 front LED system, but it's always changing as the bug hits me.
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    Cutters Customer Service Question

    I've done this before and it seems to work better than queries through their website.
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    Low Cost Host for 30mm Aspheric - Suggestions

    Thanks Long John. Is that lens the 30x15FL or 30x20FL. Also, what method did you use to retain the lens in place. Cheers again
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    Low Cost Host for 30mm Aspheric - Suggestions

    I have two different aspheric lenses that I would like to house in a flashlight head and then modify further into a bike light. One type of lens is exactly 30.0 mm and the other is close to 32 mm. I have purchased a cheap host from DX I though would be ideal, only to find that the external...
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    Dynamo driven led light questions

    That part hurts my brain... This would be an excellent concept, and could enable this circuit to be used with lots of different models of dynamos, if the capacitor sizes can be altered for the different frequencies expected. The ATTiny15 has 64 bytes of eeprom that could be used to store 2...
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    Dynamo driven led light questions

    The numbers ktronic posted seem to show a difference, with the peak for 4x100uf at around 27.5kmh, and then at some point above 30kmh the 4x47uf setup peaks even higher. That was for fullwave, and the curves for a doubler circuit show that 2x200uf is best at up to 15-17kmh, and after that a...
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    Dynamo driven led light questions

    The circuit I (roughly) had in mind was fairly standard, but with 2 approx 50uf bipolar caps in the ac supply line, bridged out by triacs when not wanted, and then a doubler, again enabled/disabled somehow, probably with fets. Unfortunately the triacs have a 1.5 or so volts vf so with two thats...
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    Dynamo driven led light questions

    What lind of switching element will you use for this circuit. I considered using Triacs on bipolar 'crossover' capacitors, although they are large in size, and the voltage drop across the triac is a killer too. FWIW I have some microcontroller code I have written for an ATTiny15 8 pin device...
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