GFS16 - Battery Indicator Tailcap Light & 1mR FET Tailswitch! (Rev B)

Never said free. Will probably sell it at cost, with shipping. It does cost money to actually make it.

It should be fairly easy to build.

Shhhh!

No prob there Blue!

1. BlueSwordM

2. BlueSwordM

3. Inkidu

4. Shirnask

5. TomE

6. TomE

7. Kawiboy1428

8. Kawiboy1428

BTW, I’m probably going to include the springs inside of the package if you don’t want/need a bypass, although not soldered for shipping not to explode.

A dual spring setup will easily be able to sustain 20A continuously.
Technically, it’s 21A for nickel plated, and 24A for silver plated, but it’s about the same number for me.

Blue, which super cap did you go with, if you don’t mind me asking.
I ordered 6 sets of oshpark boards.

Opps, I fixed it. :person_facepalming:

I haven’t ordered the super caps yet, but:
https://www.mouser.ca/ProductDetail/Seiko-Instruments-Micro-Energy/XH414HG-IV01E

If you want, to lower costs, I can buy in bulk the components with you. Will ship them as quickly as possible.

Sounds good to me :+1:

I already purchased all the parts for both the led and fet boards x 6.
Ordered almost everything from Arrow and a few pieces from Mouser. Mouser charged me 8 bucks for shipping for what would fit in a soda bottle lid. :confounded:

Oh boy. Damn it.

That must have cost a kidney in shipping.

2 for me please. If there is any fet switches left. :+1:

1. BlueSwordM

2. BlueSwordM

3. Inkidu

4. Shirnask

5. TomE

6. TomE

7. Kawiboy1428

8. Kawiboy1428

9. MRsDNF

10. MRsDNF

11. Inkidu

Thanks. :beer:

Just in time MRsDNF. :+1: Better late than never. :beer:
2 more left I think.

Yep, 2 more left.

I should be receiving the PCBs next week.

I just realized one thing: I only have one spare Omten switch…

I’m going to have to order some.

I buy a bunch of these. It’s a 3 pack so keep that in mind.
https://www.fasttech.com/p/9627747
They have a discount going on too. I just ordered some for I believe it was $1.08 for a 3 pack ordered 2.
Ordering more gets you into the 3 or more volume discount but its still a good deal.
The last order I placed a few months back was a 5 pack for these but the led’s were orange.
They looked cool but had a higher drain. Orange isn’t as efficient.
I’ll add that the resistor might need to be changed to something higher, the orange was too bright.

I was talking about these actually:

I meant the physical switch to activate the gate of the FET.

Yeah I know, I just rob the switch.
If I want to drop one in something else like a V11R for a lighted switch, I just drop it in. Takes care of both needs. :+1:

I’ll buy another one.
Two by two they marched.
I ordered a couple boards from OSH park but I can’t see myself being able to solder such small components. I was ordering the 17mm high-amp switch pcb by Pilotdog68 (great name) so why not add a few more. Would a stencil be an option for the GFS16? The attachment battery/super capacitor would still be a hurdle though.

Yes, but since it’s more complicated compared to an LED MCPCB, making a DIY stencil will very hard.

I’ll have to solder these components by hand, which I’ve already had practice off, so shouldn’t be hard at all, unlike the boost driver.

After waiting long time for all component to arrive, I finally start building Gfs16 switch to add to my Gxb172 driver. I use Oshpark to order pcb, and I order 0.8mm thick pcb so it will fit in switch. If it is too thin, easier to add some tape to make thicker. First I solder the mosfet pcb.

The battery fresh from order measures at 2.5V. I am using white omten1288 switch. To make switch, first I use hot air and solder the lfpak33 mosfet on the opposite side of the pcb, and then I solder the smaller component on the top. All this is good and easy to solder after practising from Gxb172. Next to make sure I do not short battery, I tape my tweezer in tape. Then, I flatten the lead on the battery and straighten it, and cut using sharp cutter.

This is result. A little bit of balance and soldering is actually quite easy. I measure circuit after to make sure no shorts on soldering. Then finally I solder on white switch.

For the led board, I decide to use white led as light, and red led as low battery indicator. I experiment with resistor and decide to use 27k for white, and 7.5k for red led. I begin with side with small component. This is where I make my first mistake! I only order 2 N-fet, which is a big mistake, because I move too fast and knock the two tiny fet off the table!!

I almost give up but after 20min search, I finally manage to find them. So I advise everyone to buy more component then they need!

Soldering is not too difficult, except for 3 tiny mosfet. I recommend soldering slightly to the side. Then hot air and flux to reflow easily.

This is complete led side. I use 0603 red and white led from Aliexpress shop. I do quick test and it lights up! However I run out of time and will continue later.