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What's your rationale for that? If he's running each diode at 500mA each, that's only 9.5A of diode current. Assuming he's bucking to get that, let's say approx 7A of battery current. If he's using 5,000 mAh 26650 cells, that's like 40 minutes of run time.

Often, the time limit is reset to X days from the latest delivery date estimate they've provided you with. So, if they've extended your delivery window by email, and you have proof of that, it's worth a shot.

Can someone explain to me why you are not simply reversing the charges?

You'll need to design a driver for that, because none out there work that way by default, but itv shouldn't be hard. Use something like an ATTINY to turn the voltage measurement into control of a digital potentiometer, and use the digital potentiometer in place of the trimmer that would normally...

Interested

I don't understand why these issues keep arising. If you order something that isn't provided, reverse the charge on your credit card, and move on.

Well, it wouldn't work for me, since that is a buck driver, and I need to go from 11V to 42V. But for your application that might work well.

I already had a boost circuit based on the LT1370, so switching to the LT1370HV was easy. I'm a big fan of external FETs though, so I like the look of that IC Not very much. I was planning to parallel 6 of them at 500mA each.

I see that the ZXCT1107 can handle 36V.... I wonder conservative that is. IE, I wonder if it will still work at 42V? It sure looks like some funky stuff happens to that IC after the 36V mark (scroll down): http://www.diodes.com/datasheets/ZXCT1107_10.pdf Re: the caps, I'm using 3x in series...

A long time ago Sinner built me a version of one of his hosts that takes 3S3P 18650s (ie, it takes 9x 18650s). It's a monster. I've decided to build it into a flashlight, rather than a laser, so I picked up a COB LED that requires 42V. So - I needed a boost driver to boost 11.1V nominal voltage...

Can you give an example? I'm not seeing it.... 10x qty of 520nm 1W diodes is 2300 Yuan per piece. That's like $375 USD. Hardly "holy cow" inducing ;)

That all looks run of the mill to me, no?

Bummer :( A host like this really deserves a real driver pill IMO. Such an elegant host.

Since its EVBLOG, I'm guessing the video is 7 and a half hours long. OP may want to bottom line the advice in the text of the post (also useful for those reading on mobile)

Agree - techhood is probably trying to maximize early adopter profit. Podo - I'll give one of yours a shot. Can you ship to Canada for that $180? If so, shoot me a PM, I'll give that a shot :)

If I misinterpreted your PM, feel free to clarify (and if so, my apologies - but it was pretty short, and I thought pretty straight forward)

On the bright side, it's a realistic use case when testing drivers for portables. What I often do is use a lipo. If you grab a 3000mAh 2S 20C pack, our "high currents" are nothing to it.

Can you show a picture of the driver pill?

I've said my piece here in the thread, and it was a very honest straightforward perspective on why your approach irked me. Don't take this to PM and suggest that crazyspaz bribed me to say what I said. That's childish, and I have no interest in arguing via PM.

I think the reason your approach was discouraging, is that most of us give a lot of information and resources away to this community that we could be using to make money, but we don't, we give it away freely for everyone's benefit. I'm not anti capitalist, by any means. But when you make a...