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    Buck switcher troubleshooting

    Re: Buck switcher - good news I have some good news to report. After having no luck on the breadboard I dead-bugged the circuit which is something I didn't even know about until a few days ago (thanks to dat2zip for mentioning it). It is now running great with about 12 hours on it. It runs at...
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    Cutting perf board cleanly? How?

    [ QUOTE ] milkyspit said: ... What sort of damage could occur from that? [/ QUOTE ] I'm not an expert, but fiberglass (glass fibers) are classed by OSHA as a "nuisance fiber". Supposedly not the right length to embed in lungs and cause problems the way, say, asbestos does. Edit: I just...
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    Do I need this hot air gun? Says it's for SMT...

    Re: Do I need this hot air gun? Says it\'s for SMT... If you want to try hot air soldering without dropping big bucks it's been done with a Rat Shack de-solderer and aquarium pump. Havn't tried it myself but here's an article on the construction. Cheers Duane
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    Using SMD in protoboard

    [ QUOTE ] Pablito said: please (dat2zip & bikenomad) explain a little more this method. Thanks [/ QUOTE ] I didn't know either so I Googled it. Lots of info out there. Duane
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    Cutting perf board cleanly? How?

    Score each side along a row of holes(through the centre) with a sharp knife, give it a snap. A touch on the belt or disc sander cleans off the remnants of the holes. Duane
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    Buck switcher troubleshooting

    [ QUOTE ] MrAl said: After taking a quick look it looks like you can get away without using the 5v regulator for that circuit. That voltage is OR'd with the power supply by two diodes internal to the ic chip. [/ QUOTE ] Hi Al, thanks for that tip. I still don't have great confidence in my...
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    Buck switcher troubleshooting

    [ QUOTE ] bikeNomad said: You probably don't want an .ac simulation (unless you're modeling the control loop, in which case their model isn't what you want and then you have to use the info in the datasheet to do your own amp & network model). Instead, use the .tran directive. [/ QUOTE ]...
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    Buck switcher troubleshooting

    [ QUOTE ] bikeNomad said: I've used this model: .model Luxeon1 D(Is=2.27n Rs=0.25 N=6.79 Cjo=42p Iave=350m mfg=Lumileds type=LED) [/ QUOTE ] Thanks for the Luxeon model. I can't get the sim to run though. I get a caution "This simulation calls a time domain model, LT1510. It probably won't...
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    Buck switcher troubleshooting

    [ QUOTE ] bikeNomad said: It does now. Mike Englehardt, the author of SWCadIII, is very good about updating the program itself, and LTC is good about making new models for their parts. [/ QUOTE ] Thanks. I was able to build my circuit in SwitcherCAD. Not sure how I'm making out in running it...
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    Buck switcher troubleshooting

    Hi Ned, >My recommendation would be to get a free copy of SwitcherCAD III from Linear Tech and simulate it. SWCadIII will even run under Linux (using Wine). I did have a look at SwitcherCAD but it doesn't seem to contain the 1510. I don't know if it could be modeled or not but I think that'd...
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    Buck switcher troubleshooting

    Hi Al, thanks for your input. The inductor is a Pulse P0751 33uH, 2A power inductor, datasheet here. ?Also, why did you leave out the 1k resistor in series with the cap 'C4' ? This could have a lot to do with the stability of the circuit during regulation. Good question. I first got...
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    Buck switcher troubleshooting

    It's now running on the bench but I'd rate my first attempt at a switching regulator only about 40% successful. Based on a Linear LT1510 charger I was trying for constant current outputs of .3 and 1.2 amps. I lowered the current by a switch that removes one of the parallel resistors from the...
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    dynamo help needed

    I don't know if you're aware of it or not but there's a mail list called Bikecurrent that offers an extrodinary depth of knowledge in all areas of bicycle electrics. There are several dynamo experts there (I'm not one of them). It's nearly as friendly and helpful a place as CPF. You can find...
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    Attn: Canadians

    Thanks for the tip. Is that in your local store or online? Duane (Courtenay BC)
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    Best way to drive 3 Luxeon IIIs??

    not a photo... But a drawing of the template for the plate. Maybe better than nothing. Duane
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    Best way to drive 3 Luxeon IIIs??

    Re: Thanks for the ideas.. [ QUOTE ] Sprout said: Thanks for all the ideas... Duane, how big was your heatsink, and could you post some pics? Mark [/ QUOTE ] The heat sink (.125 al) is an arc shape to follow helmet contour roughly 5.5" by 1.5" high. There's about .75" between...
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    Best way to drive 3 Luxeon IIIs??

    I\'ve done this Using George's driver tweaked for more current and it works great. My first attempt used the tri-lens but with the three stars that close together the heat sink got very hot (big chunk of al would hit 70c in a couple minutes at 5c ambient and no air flow). I had better luck by...

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