Oshpark Projects

Still missing too many parts to fire it up, but it's partially assembled to give you an idea of how it looks with and without optics, and in and out of the host. Most of the work is going to be creating a spacer block on top of the old LED board to help them new emitter PCB sit tight against the lens. Not too difficult, but important for heat sinking purposes as well.

If the back side is raw copper pour would you be able to possibly solder the entire thing to a 50mm copper round from etsy?

That is just too damn cool!

That could work, though I'm not sure how thick those rounds are?

20ga or .953 mm

I bought a stack of em…about 1/2 as thick as a standard SRK aluminum star, not that thick but thicker than the microscopically thin copper pour that is on the PCB

Too damn cool indeed! Both Mataus build and Cereal Killers board!

I keep watching in awe!

Is it correct that at the moment no BLF20DD is available at Oshpark? (the link in the OP does not go anywhere anymore).

I would have liked to order one (=3) for a UF LZZ15 mod in the planning.

https://oshpark.com/shared_projects/SNtRM4Vs

Thanks Werner!

You just need the one? I have one left I can stick in your package that’s shipping this week so you arnt waiting for ever. let me know if you want it.

Too late, just ordered it, thanks for the offer though :beer: . I just today ordered the light it is going in so the Oshpark order will probably be in earlier than the host, so there's no hurry :-)

Yeah, the BLF direct drive drivers have been updated, the C1 has been relocated between the B+ and GND in order to eliminate the accidental boost effect of the cap and the diode when the power starts fluctuating/pulsing when the FET is turned off and on by the MCU…these revisions should eliminate the issue with dodgy mode selection and have the buffer resistors removed completely, also added off time caps on star 4 pin. I tweaked them up and Mattaus has reviewed and reposted all of them, the OP hasn’t been updated yet (also reset the “version/revision” number because they were getting squiffy)

Are the eagle files anywhere available? Or is this closed source stuff?

I believe Mattaus has them

He retains “intellectual license” on them so might want to run it by him if you want a copy

Ha, so I ordered the latest and greatest version . Thanks WH-AVG, Mataus, comfy!

I'll send you the files tonight. For some reason the latest revisions are not in my dropbox folder. Warhawk can probably send the last revisions he did as they are exactly what I used. I made no functional changes; all I did was add labeling to make them all V1.0

Feel free to do whatever you want with them. 100% open source. I started them, the community can do what they please with them.

- Matt

Here is all I worked on

https://www.dropbox.com/sh/cf07rngyitlwzu3/AADVXbp1l3n-J20txXg1weCAa

Guys... in researching stuff for an unrelated driver I killed, I found it used a bunch of little SOT-23 FETs, the AO3400 (top marking is 'AO7T'). Digikey page: http://www.digikey.com/product-detail/en/AO3400A/785-1000-1-ND/1855942

Check out the datasheet. Compare it to the one we've been using on the 15DD: http://www.digikey.com/product-detail/en/IRLML2502TRPBF/IRLML2502PBFCT-ND/812502

Higher voltage & current ratings, lower on-resistance, and an easier-to-drive gate?

Same package size and solder footprint…nice!

There are a lot of small FETs which are better but the 2502 was so cheap available from china so that it got a kind of rush.
If you order from a bigger distributor anyway than there is a newer version of the 2502 and IRLML6344TRPbF.

They “all” seem to have the same footprint, so a major investigation should find even some better ones.

Who is going to be the guinea pig tester for this? Sounds all good... I'm using a BLF15DD now, and planning on more in those cheap little AA zoomies and it works well, not crazy amps because I don't want crazy amps in that little thing... I'm using a Sanyo 840 and get decent amps but still in the 2.n range. Just ordered the Efest IMR 700's from RMM, so expecting to get more amps. The 15 mm boards are great for little lights, but 5-7 amps is a little insane Tongue Out.

I wouldn't mind trying it I suppose. I can add qty 2 to the next DigiKey order at work here, hhmmm.....