This should be a similar cart for the 17DD & 20DD boards: http://www.digikey.com/short/hqzd0
The Vishay 70N02 FETs are here: http://www.ebay.com/itm/271319198579
For those who want one-stop-shopping and/or single parts instead of the batch of 10pcs from ebay, this part from Digikey should be about the same: http://www.digikey.com/product-detail/en/AOD510/785-1481-1-ND/3603497 I have not personally used one so no guarantees, but the 'important' specs look right. TO-252/DPAK, 3.2mOhms, 21nC gate charge, low gate threshold voltage, etc.
I just noticed the ebay listing, there was only 1 sold when I first found them, now it's up to 56. lol.
Wow, what happened to the price on the tiny13?? Last week I ordered 30 @ $0.54 each, and right now the same quantity of the exact same part in the same packaging is $0.99 each?! :O
$0.54 each or per set of three?
I’ve done ⌀ 10.11 mm for $0.75 (set of 3) and ⌀ 10.39 mm for $0.80 (set of 3). Its still giving the same prices if I go to reorder those. Same prices for other projects too.
“Tiny13” or Tiny12? If not the 12.12 mm Tiny12 then what is the exact size of these $0.99 boards?
I only used that one making the lists because at the time, it was the cheapest one Digikey listed. That price bump moves the total cost up to where it's getting close to being cheaper to use a 105C as a parts donor. Sucks.
Absolute rock-bottom pricing would probably be in bulk from somewhere like aliexpress, but you have to take into account the shipping time and possible shady sellers/counterfeit parts. Probably not worth the risk.
One thing I have to say about OSHPark is that they seem to struggle with solder mask layers. I just received 2 batches of boards (unrelated projects) with incorrect solder masks. I checked the projects on OSHPark and the automated renders look fine. However on my boards they are not! One one board there is mask where there shouldn't be (so now I have to hand scrape it off so I can solder to the copper underneath). On the other board there is no mask where there should be, so I have no guide at all when soldering the components down.
Thankfully I can more or less use both boards as they are not critical. It's just frustrating, especially seen as I've been waiting 3 weeks for the boards.
If you know of any working schematics…maybe someone can design the PCB
Plus I think the FET and 7135 ATtiny13 driven has TONS of research already done and is MUCH simpler than buck circuits of any sort of high power output
I can only speak for myself but it's basically because they are bloody difficult to get right and take a lot of time to get working. For the most part, linear and DD drivers take all of 5 minutes to get a basic design working. I'm more than happy to open source the basic stuff but the drivers that take hundreds of hours to get right are a different story.
On the other hand I'd be more than happy to contribute to a team designed open source switch mode driver.
It’s not so much an emphasis as hopefully a starting point. A bunch of boards were designed in a short time and it made sense to me to get them all together. Any flashlight related Oshpark projects would fit the bill and I’d love to have boost and buck boards posted as well. Help us find them!