22mm 16x 7135 driver for F13 flashlights - [released]

This driver is 22mm in diameter. It is sized specifically for the new monolithic-head (no-pill) F13 flashlights such as the Ultrafire F13. The retaining ring threads on top of the 7135 cases. The 7135’s on top of the board have a setback such that the cases should clear the ledge inside the head, although the tabs may not. This should ensure good ground contact. I used ~20.5mm for the ledge.

On top of the board is space for the MCU, an SOD-123 package Zener diode, and a 0805 package offtime cap. On the bottom of the board are places for a 0805 voltage divider, a 0805 smoothing cap for Vcc, and a protection diode or 200Ohm resistor. The copper pour in the center is 8mm in diameter, but the exposed copper is only 7.5mm - scrape if you need that little bit extra!

Two special 7135 placements must be considered:

  1. one for the GND trace for the smoothing cap - there are 4 possible choices
  2. one for the GND trace for the top of the board - there are 2 choices and both are on top of the board
    If you don’t want to use those placements you must manually bridge GND.

See post #38 for v016 (initial release) and pictures of my 12*7135 build. And see post #54 for v021, the current version.

Here are the gerbv screenshots:

C1 will make it VERY difficult to program the ATtiny13 on board

Is that the ground pin for off time memory for STAR firmware?

Otherwise…very very nice design!

Oh and VIAs for ground rings (I use .3302 for those)


Do you usually leave the sharp corners on the traces, when I worked on Mattaus’s designs he and I both put small angular reliefs at the sharp corners

Yes, that cap is for offtime STAR firmware. Unfortunately I’m sort of out of space to put it anywhere else and still look all cool.

Thanks for the compliments and thanks for taking a look!

umm…where is the + and - pads for the wires?

I do need to add those GND vias, totally forgot about that.

Mattaus is a stickler for rounding corners, but as far as I know there are only two reasons to make nice corners:

  • traces that carry delicate signals (high freq or something)
  • making fabrication easier

Since we have guaranteed tolerances for these I don’t care about fab issues. None of our signals are delicate.

Being the off-time cap it’ll be ok there since you have to remove it to flash anyway. I’m glad it’s there, not that it’s hard to out it between the pin and ground but it’s always nice to have a real pad for it. Looks good, I have a light that needs a 22mm driver, I have a contact board ordered but I’d love to order a set of these for it instead and test it, if your looking for someone send me the files and I’ll order 3.

Yeah, makes fine tuning the traces a pain but make for a cleaner render (but makes your head hurt from all that tweaking, re-tweaking, and tweaking some more)

either way, once it’s done it will be a POWERHOUSE of a driver…gonna make those XM-L’s cry for mamma :smiley:

This will go into a F13 and other 22mm rigs right…I got mine in today :slight_smile:

ah…forgot about that

And I guess if you get a good off time build you probably won’t be reflashing that often huh?

Yeah, that’s a minor problem… :wink:

This version has:

  • 0.5mm vias added to the GND ring
  • thinner Vcc trace routed between pins on MCU
  • 1.1mm vias for LED- and LED+ to accommodate ~20AWG stranded wire.
  • copper pours slightly larger than 1x1mm for LED- and LED+

I haven’t gotten things 100% worked out with where I’m removing the solder mask for LED- and LED+.

First set is on the May 04 panel!

tStop on minus pad

need - and + on tDocu

And I usually make the identifiers .6~.8 but that’s just me (yeah…nitpicky I know)

And need a BLF on it somewhere :wink:

I did mention that in post #10. There’s plenty of copper there to solder to. I’ll probably leave both pads covered in the next version and remove the mask from at least part of the two big vias. If someone wants to solder to the small 1x1mm surface area they just need to scrape.

Identifiers? The GND vias are 0.5mm because that’s what fits.

The tDocu letters R1, U1, the white letters on the silk screen (identifiers ???)

Still a pretty darn cool design

Oh, gotcha. I just ignore that stuff until the rest is sorted out.

Is R1 a resistor or diode?

Depends on whether D1 is populated with a Zener diode or not.

I was confused why there is a zener diode for a single cell flashlight driver. I'm guessing you're designing in options for use in other lights later on?

It looks good.