MTN Electronics: LEDs - Batteries - Lights - Chargers - Hosts - Drivers - Components - 1-Stop-US Source

RMM · March 28, 2015, 8:28pm

No, all of the chips are in parallel, but if there is a slight short between the PWM and ground/output it could limit the PWM output enough to lose the low modes.

zoom_zoom · March 28, 2015, 8:51pm

Your talking about on the 7135 chips? a possible small short on the middle stud of one of the chips?

Jubeldum · March 29, 2015, 1:46am

Thanks for making it too easy for me. I just dropped about $120 in your candy store gosh darn-it.

RMM · March 29, 2015, 4:47am

Hey guys, I'm a little behind (again) on orders, but Lisa says I've got to take a break tonight. I took the MPRE this morning and have been studying for that a lot this week, and I'm just plain exhausted. Will try and get some rest tonight and hit it hard again. Thanks for being patient.

DB_Custom · March 29, 2015, 5:01am

Lisa’s right, have a Black Russian on me and hit the sack. Pamper her tomorrow while taking the day off from Everything!

Rufusbduck · March 30, 2015, 8:21am

RMM:

Lol. You guys are pretty funny!

After 12 hours of reading and taking practice exams, then a few hours of flashlights and e-mails, my brain is pretty much mush and I’m ready to go to bed (nearly 1 AM here…again). Another teaser for you guys:

22mm single-sided 6A buck driver. Yes, this one works, but need to make a few more tweaks to the layout and do some more torture testing in the light.

I think there will also be a double-sided build for “higher power” applications and for easier flashing (with a normal SOIC-8 attiny).

The 17mm also works…kinda. Need to go back to the drawing board on that one. I was trying to get the best of both worlds out of it with a high-powered SMD inductor build to keep things short and compact (think: P60 and small 17mm lights) but now after a few revisions I think that in 17mm you can’t have it both ways. I think that I will do two 17mm boards: One for 3A or so that is super compact, and another for 8A+ (obviously only around 6A into an XM-L2) that has the option to use either a bigger SMD inductor on a daughter board or a toroidal inductor.

Too many projects, too little time. I try not to share too many of these things with you guys because with my current schedule all new developments tend to move in sloooowwww motion. A lot of things, like this driver, began real development back in December.

Again, I’ve got to give thanks to everyone who has helped along the way. Comfychair always pushed the limits and had some crazy new ideas; Mattaus started hooking us up with our own PCBs, and gave me the courage to start; JonnyC created the program that I run on most of my lights; wight did some crazy layouts and often was my “go to” guy to bounce ideas off of when I would get stumped. I couldn’t have done it without these guys, and many more here on the forum as well.

I’ll share this on Oshpark when it’s ready. No ETA.

P.S. I’ve got two ready-to-go 10mm FET drivers with guppydrv. I’ll get them listed on the website sometime in the coming days.

This would work in any p60 host using shorter triple or quad optics and a custom sink/pill. Add 2 x 18350 and call it a night. Or call Hoop. 8) Sweet!

Halo · March 30, 2015, 3:35pm

RMM, noticed typos on FET Driver DIY Parts Kit - MTN-10DD/12DD

0605 should be 0603.
Not really a big deal but it could confuse some people.

RMM · March 30, 2015, 3:46pm

Thank you. In the future, if there are typos could you please send me a PM so we don't clutter up this thread?

Joat · March 31, 2015, 2:44am

Are you going to have any 17mm fet plus 7135 drivers available soon, of should I Wight’s board from Oshpark and a parts kit from you?

RMM · March 31, 2015, 4:50am

Yes, I will be adding more tomorrow. I don't have a parts kit for wight's 7135+FET board available currently, but when I do you would have to tell me it is for his board otherwise the PWM output would be backwards (mine is switched due to the board layout).

shrick · March 31, 2015, 11:27am

Hi Richard. I see 7135+FET does not have guppydrv as an option? Is this on purpose? Thanks.

RMM · March 31, 2015, 3:16pm

Yes, it's on purpose. There isn't a dual PWM guppydrv yet.

Gunga · March 31, 2015, 5:48pm

I had a question. I managed to file the 15mm 7135 driver down to 14mm (lots of work!).

http://www.mtnelectronics.com/index.php?route=product/product&path=67&product_id=342

I placed it into a tight brass pill, but may have bottomed it in the pill. I notice a cap soldered across the pins on the “brain” chip rises above the components. If this cap is shorted to ground (the pill), does that kill my modes? I only get max, no modes. I’m assuming if I space it out a bit (maybe use some kapton tape) I should get my modes back?

RMM · March 31, 2015, 5:52pm

Lol, the "brain chip" is back!

I soldered the off-time cap directly to the MCU pins because I knew that you needed it to be completely single-sided, and you selected guppydrv if I remember correctly. If it is grounded out, it won't change modes because the cap won't charge.

Rufusbduck · March 31, 2015, 7:06pm

A piece of kapton tape or dab of AA, JB, or Fujik allowed to cure before install would fix that.

Gunga · March 31, 2015, 7:08pm

Oh, it’s off time? I didn’t even know that was an option on the gupprydrv. Awesome! I’ll space it out and try again. Thanks for the info!

I can’t believe I managed to get it down to 14mm. Very sketchy and precise filing.

Joat · April 1, 2015, 1:08am

I ordered a fet +7135 driver, but the XPL V6 triples sold out before I got a chance to order them. I’ve just got to learn to order when things show up as in stock. V5 is almost as bright right?

RMM · April 1, 2015, 5:22am

Yes, they are very close. The bigger difference is the tints available--I doubt that most would notice the difference in output without a light meter.

Gunga · April 1, 2015, 7:58am

One more question. I spaced stuff out and got the modes to work. How low is moonlight? I don’t find it that low. It’s pretty close to the 2% level by I assume that’s because I only have 1x 7135 chip?

RMM · April 1, 2015, 3:12pm

It is because of the single chip. The minimum PWM level (moonlight level) I have with guppydrv is 5, which is what I flashed on there. I didn't have DrJones make any lower than that, because it is rare that anyone orders a driver with less than 3 chips. If I were building a custom program for that driver I would program 2 as the moonlight PWM with only a single chip.