Hello Mattaus!
congratulations for your PCB!
What do you use to draw them?
I'm downloading Kicad, to try to play a little!
What do you advise me to start?
thank you!
I see, I looked up that little FET (0.37 euro at a local website, I bet it can be had cheaper), it has an internal resistance of 0.045 ohm, that would give a voltage drop of 0.1V at 2A (if I remember Ohm's law well ;-) ).
Use CADSoft Eagle. Its free. Any tutorial will have you on your way very quickly and then its just a matter of practice, practice, practice.
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.
Sorry Matt, I was rushing a bit this morning myself and didn’t look them over before copying the links from Oshpark. I’ll mark them in the op as not ready for prime time until they are.
OK I've changed the 15, 17 and 20 Direct Drive drivers. You'll need new links though. They are all under my OSHPark profile.
The diodes on the FET boards are the stock off the Nanjg boards, I had to special order the ones you have on your 20mm I built TexasPyro…but it worked like a charm though
(DIY’ers can’t be choosers 
)
It was my fault the 17mm board got pushed…we hadn’t reviewed it…my apologies to you Mattaus. I already ordered 3x of em…so that is my penance for rushing you.
So that last SRK board with the FET looks rather awesome. I just can't keep up with all that is going on in the world of drivers. I'll just wait until RMM stocks them :)
New links in place.
Make sure you mention his uses a Zilog MCU not an ATtiny13A
It has 8k flash, but needs a special programmer…but I tell you, his turbo my using those FETS! WHOAH!
And for a little driver porn…forgive my photo ability…I only have a cell phone camera
Nangj 105C 32*7135 SRK driver
This one was done on a skillet on my stove
TexasPyro 20mm Nangj 105C
This one was done with a hot air rework station (in about 20 minutes)
You got one already? Wow, that was fast...and I'm jealous :)
Mattaus wrote:
OK I've changed the 15, 17 and 20 Direct Drive drivers. You'll need new links though. They are all under my OSHPark profile.
Darn, I think I ordered before you changed. Do you know if I have to request a cancellation from OSH Park? Hoping they know to use your latest version.
EDIT: I created Support Tickets asking them to substitute the changed designs for my orders. If that doesn't work, I imagine I might be able to rig a ground connection on the boards.
Shoot em an email BEFORE it goes to production
Which ones did you order? You might be able to add a couple pieces of wire near the edge to act as a ground ring.
All 3. The 15, 17, and 20. I created support tickets for them. If that doesn't work your wire idea will probably make them functional. Thanks for the suggestion.
I’ve sent TiVo a pm with an invitation as he is offline now and this thread may be well down the pages before he comes back. Any other Oshpark flashlight projects that people can think of should get mentioned as well.
The BAT54WS is in SOD-323 package. The BAT54/A/C/S are in SOT23 package.
I would definitely hold off with the FET based design. It's not working well with more than one FET (accommodates up to 4), and he's still working on a solution. The fix will probably be a design change.
Thanks Tom, I want this to be as inclusive as possible but it makes sense to be sure that these are working systems. Is the 7135 board a go? Matt’s larger designs are based on Comfychairs work on the nanjg east-92 which is well enough established by now but the 15 mm board uses a much smaller FET that has not been tested to any great degree if at all. I have some of the IRLM2502’s coming that I hope to try on a regular nanjg board within a week or so but they were an option suggested by Werner for a very similar project(I would call it a parent project in fact) that he was(and may still be) working on. Patience not being in abundant supply around here we’ve been jamming to get these done and ready to try but testing has been mostly limited to the 70N02 FET. I would suggest that initially at least people consider these FET boards as beta prototypes until they have been assembled and played with in greater numbers.