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When you start getting up into these current ranges, absolutely every spec of every component starts to become critical. You start trying to minimize inductor DCR, use better lower resistance mosfets, maximize traces and go four layers to add more copper, minimize sense resistance as much as...

I didn't really understand what the scam is here. This would have benefited greatly from a TL,DR. That said, I've got an ages old PayPal account that always had CC and bank account connected. I got sick of switching the account each and every payment, so I called PP and had them remove the bank...

Gosh, I don't know.... Let me guess, you want to tell us about Berlin lasers dot com, right? Obvious spammer is obvious.

Since people started buying Chinese capacitors?

Ya, there's no reason to remove the heatsink. It requires the heatsink to run properly. That's part of the driver design.

Re: The "Clean Edge" Driver - 2.85A driver for pushing 462s (478nm hit so far) No you can't, you'll damage it. It's thermal epoxy, not just thermal grease / something removable. It's not a big deal though, because I can tell you what generates heat - it's the MOSFET and current sense IC (which...

Re: The "Clean Edge" Driver - 2.85A driver for pushing 462s (478nm hit so far) Wow, this is cool! I'm excited already! It's so revealing to see the driver on a FLIR! Can't wait to see how it scopes. That was one of the first few revisions, so my fingers are crossed ;)

I'm probably going to suck it up and order a batch of these hosts on my own dime, notwithstanding that there weren't many takers on the groupbuy. If anyone is interested in one, let me know. I don't need the money up front.

I may turn to that, and in fact I already have a circuit designed around that chip, and pcbs, around here somewhere. It's just such a large IC. Even the SMD package is 10x10 mm.

I guess the proof will be in the pudding - and I see you've ordered one, so you can be the guinea pig ;)

That's a good point. You're probably correct.

Lol, "Professor Teej", I like it. Not the worst nickname you could be given. For the record: "You're not smart enough to figure out the electronics of power scaling without a power feed, therefore your criticism of heat dissipation must be wrong" = ad hominem (and a couple other fallacies too)...

Does anyone have a simple circuit for scaling a battery voltage into progressive LED bars? Is it possible to do this with passive components? (I know there are ICs out there). I'm looking to scale the voltage between 3.0 and 4.2 into between 0 and 20 LED bars. Any creative solutions?

Any chance you can scrape a tad of the weld material onto the tip of a soldering iron to see if it melts at solder temperatures? If so, we could probably use a toaster oven to desolder the diodes.

Nope. It's valid analogy. IE, analogizing the flawed reasoning in a manner that retains the underlying logical fallacy (responding to a challenged specification by highlighting the its upper end figure isn't practical anyway). The test he needs to do is to take a 60 second measurement, and then...

100g is a very unrealistic weight for that heatsink. I don't know if your calcs are right or not, but I get a very different impression of the temperature rise from looking at a datasheet: http://www.digikey.ca/product-detail/en/EA-T220-38E/EA-T220-38E-ND/2342473 Even based on your calcs...

Seems like the 560 should be lower. IC can typically handle 500mA gate current.

Cyparagon / TLS, What do you think of this part, to accomplish the inversion above? - Rohm QSZ2TR http://rohmfs.rohm.com/en/products/databook/datasheet/discrete/transistor/bipolar/qsz2.pdf and is there need for the 560 and 22 ohm resistors shown?

I think that if you desolder these two: Then add back a 0.62 ohm, 0805 resistor (1/4 watt ideally), to one of the slots, leaving the other empty, and you'll get your 400 mA. Add an second resistor, 2.5 ohm, 0805 (1/8 watt is fine), to the other slot, and you'll increase to 500 mA. Might be...

Re: Fs: 5 NEW HOSTS ADDED TODAY 5/1/15 I can't really tell. It could be either. PS. I know what you mean. I keep bugging Ehgemus to stop posting such tiny photos. His hosts are so beautiful, but the photos are almost thumbnail sized. 320px wide? Come on, we're not on dial-up ;)