Rufusbduck wrote:

ImA4Wheelr wrote:

Tivo532 has a couple:

Thread – DIYDriver AMC7135 and DMG6968U

OSH Park Project – DD

 

Thread – DIY Driver Nanjg Style/AMC7135 using Z8F082A MCU

OSH Park Project – 7135

I’ll put them up if it’s ok with TiVo. Don’t want anyone left out but also don’t want to step on any toes.

Hi Rufus, the OSH Park Project – 7135 is OK and tested. The hybrid(DD) version may need a re-design. Can be used as is if only using 4×7135, 8×7135(stacked) or any from 1 to nx 7135 that you can fit. Cheers!

Rufusbduck wrote:

Thanks Tivo, I’ll need a link to the board at Oshpark so it works like the others. I can’t access anything earlier than July 30, 2013 to create a link in the op. Do they dump older files? And would we need to save them somewhere to re-upload if necessary?

I think OSHPark doesn’t have a search feature on their shared projects.
Here’s the link: TZF082A LED Driver – AMC7135

Cheers!

Check to make sure this link works, should be a cart pre-loaded with the parts for the SRK FET board.

http://www.digikey.com/short/mn9wj

comfychair wrote:

Check to make sure this link works, should be a cart pre-loaded with the parts for the SRK FET board.

http://www.digikey.com/short/mn9wj

Genius idea! Rufus - this should be added to the OP I think.

EDIT: Links works too.

The big diode & inductor (must be used together), & big cap are optional. Depends on how low the low needs to be, and whether it needs to be dead silent or not. There's a range of inductors that will work also, 1.2uH gives a pretty big effect on dropping the low mode reeeeally low, but anything from .58 to 1.2uH can be used. The 1.2 is a good baseline choice that should work for 90% of folks.

comfychair wrote:

Check to make sure this link works, should be a cart pre-loaded with the parts for the SRK FET board.

http://www.digikey.com/short/mn9wj

FET comes from the EBAY link (I already have 10)

Payday I will be ordering 3x FET SKR, 17mm, and more than likely the 15mm as well (need a link to the FET though)

I already have 10x Tiny13’s and control items (the diode, resistors, and cap)

But with that link, I know which ones to order if I need more of Tiny13 control components

I think I might also whip up 2x of the Texas Pyro 20mm Nanjg’s as well (I have 50 of those 3 leg diodes in his design)…might do a giveaway and find guys that have a good record of testing drivers and send them a few to test em out (I can build em but don’t have the setup to properly test and whatnot)

Wicked cool idea on the pre-populated cart…great job!

Rufusbduck wrote:

You want any of those 2502’s with your Tiny10’s? I should have 10 about when the boards arrive.

You talking to me? If so sure…would you like me to build you a TexasPyro 20mm and ship back to you for trade?

and/or can you test the 32*7135 build? I really don’t have any way to do a current test and/or a SRK with enough heatsinking to hold up to that kind of current…plus it seems you have a much better setup (I don’t really have one) to test/review boards or whatever

I have 2 of the V1 no tab SRK boards by Mattaus (will be getting 3x V1.1 asap [probably not this payday as I had to replace a ruptured water heater today ], haven’t put em together (shouldn’t take but an hour or so) but still have 2/3 of 100 7135 strip I got from FT…

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?!

Something change recently?

comfychair wrote:

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?!

“Tiny13” or Tiny12? If not the 12.12 mm Tiny12 then what is the exact size of these $0.99 boards?

Noooo, this: http://www.digikey.com/product-detail/en/ATTINY13A-SSH/ATTINY13A-SSH-ND/...

Last week the price break for 25pcs was $0.54ea. I don't remember what the price for a single was, but it was under a dollar.

Time to head over to mouser? “ ATTINY13A-SSH qty 1:$0.86, 25:$0.546

Daggum, even the SSU is up over a dollar!

http://www.digikey.com/product-detail/en/ATTINY13A-SSU/ATTINY13A-SSU-ND/1914672

$.63 for 10 or more
http://www.banggood.com/ATMEL-ATTINY13A-SSU-ATTINY13A-MCU-AVR-1K-Flash-20MHZ-SOP-8-IC-Chip-p-74104.html

If you order 3 or more, price drops alot!

Code indicators:
– H or 7: NiPdAu lead finish
– U, N or F: matte tin
– R: tape & reel

So SSH is NiPdAu lead finish on the leads, SSU is matte tin, not sure if that matters

Lead finish differences don’t matter enough for our use.

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.

Oshpark will remake errors. Doesn’t sound like you’d wish to wait another 3 weeks though.

Back side of the 7135 layers were a bit squiffy too, but functional

This is a phenomenal resource.

I’m surprised at the sole emphasis on linear divers though. Are there no open source step-down/buck circuits?

rhd wrote:

This is a phenomenal resource.

I’m surprised at the sole emphasis on linear divers though. Are there no open source step-down/buck circuits?

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

Alot easier to design and proven to work…

rhd wrote:

I'm surprised at the sole emphasis on linear divers though. Are there no open source step-down/buck circuits?

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.

Are there any drivers in the community based on the AX2003 ?

rhd wrote:

Are there any drivers in the community based on the AX2003 ?