Recent content by piesoup

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    Standlight and Martin's Circuit 12 help please!

    Finished!! Steve, thank you so much for your advice and patience! I have learned a hell of a lot from doing this project. When it's fitted to the bike with all my touring kit I'll post up more pics. Next project is to finish the USB / battery charging system then sew all my frame bags. Always...
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    Standlight and Martin's Circuit 12 help please!

    Now that is the quote of the day!!
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    Standlight and Martin's Circuit 12 help please!

    Thanks! I'm chuffed I found the error. Reading about the RC circuits on the one-shots got me thinking about the frequency. So I measured it at the wheel and the LEDs. Then I remembered the calculation for period and frequency. The RC circuit's 'timer' was nowhere near the 31Hz I was measuring...
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    Standlight and Martin's Circuit 12 help please!

    It works!!!!!!!!!!!!!!!!! :twothumbs
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    Standlight and Martin's Circuit 12 help please!

    I'm certain it's the bridge that's causing problems. I found two errors on my schematic from when I copied it from yours. Q2 and Q4 have their drain and sources the wrong way around! As soon as I've bathed the kid, I'll be out in the garage! I'll let you know! Regarding the voltages, my Meyer...
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    Standlight and Martin's Circuit 12 help please!

    Yip, the frequency is exactly the same before and after the fets. PLEASE PLEASE PLEASE tell me it should be double the freq after the FETs!
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    Standlight and Martin's Circuit 12 help please!

    Only a quick question and I HOPE it's the cause of the problem... at 11mph, 147 wheel rpm I measure 31Hz from the dynamo. But I ALSO measure 31Hz at V_LED / VDD at the same speed. Shouldn't it be double that?? Hence the one-shot never sees a freq high enough to change state? That would explain...
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    Standlight and Martin's Circuit 12 help please!

    Thank you for the detailed response! I can drive the front wheel by resting it on the chuck of my lathe, so when I measure the voltages mentioned above, I know the speed will be constant. I too, in my limited knowledge of electronic circuits, was baffled by the 5v VDD and the low voltage...
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    Standlight and Martin's Circuit 12 help please!

    Well, not good news. I rebuilt the board with new components, except for D1 which I reused. The high speed LEDs still do not turn on. I did some fault finding and worked out; (all voltages measured to GND) All four LEDs can work when the link to short out the top LEDs is removed. With four...
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    Standlight and Martin's Circuit 12 help please!

    Untitled by , on Flickr This is what it'll look like. I rebuilt the circuit with new components, checked that every trace on the circuit is correct. I THINK I had a few more errors on my first build. It's ready for testing tomorrow evening...
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    Standlight and Martin's Circuit 12 help please!

    That's ok, it does look like some of the available light housings. I'm desperate to get it finished, then I can start riding to work again. There will be pictures galore when it's finally done!
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    Standlight and Martin's Circuit 12 help please!

    Nooooo!!!! That's just a plastic housing for the circuit and the battery. Two holes for the cables in and out, one for the switch. I'm still using the Magicshine housing for the actual light. It's mounted on the end of my aerobars, ahead of all my luggage. It's a Chinese housing but 'proper'...
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    Standlight and Martin's Circuit 12 help please!

    Light Box by [url=https://www.flickr.com/photos/128070574@N05/] Yes, those little 1/2AA batteries are perfect for this, and small enough to add a second one if needed. There is a render of the housing. I have printed one in black. It will mount under the stem, with two holes for the cable...
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    Standlight and Martin's Circuit 12 help please!

    Hi there First thing, Steve's circuit works perfectly. Any issues I have had have been my fault!! I used cheap LEDs from the East, and didn't get good results. Using genuine ones have reduced a lot of the flicker, if not all of it. I do need to rebuild the board as for some reason the high...
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    Standlight and Martin's Circuit 12 help please!

    Once i have it working properly, I will try it with the XMLs again. But I think it could be the difference between a whole light head from AliExpress costing £7 (The XML light) verses the Carlco optic on genuine Cree leds from a reputable supplier. One XPG cost more than the entire light from...
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