Sofirn C8 Quick Review

Ok, thanks Barkuti. Sofirn has a factory and CNC machines and Cissy has given me info that they do all of their ledlights by them selves. Maybe they do for Thorfire also. Doesn’t matter to me but knowledge is power :laughing: :wink:

Some more pictures (I did reflow new XPG2 on MPCB):

Sofirn C8F vs Convoy C8:

Swap reflector:

Sofirn C8F spacer:

Test with XP-G2:

:beer:

That’s a pretty good idea, thanks.
:+1:

Yeah but lets avoid dropping another clanger kotobuki, you recently had some that's enough. Lets first make sure what is the lettering over that 8-pin chip and go Google it, can you help? I'll do it anyway once I get my C8T.

Cheers :-)

As your service, sir:

“”9926A”“:http://www.vishay.com/docs/68606/si9926cd.pdf

Cheers :smiley:

Thanks for all the in-depth info and pics! One thing I was wondering, does a Convoy C8 battery tube screw into the C8F head?

Thanks for your idea:

:slight_smile:

Nice! That looks pretty cool all mixed and matched! :slight_smile:

I have a few 9926A dual n-channel MOSFETs lying around, not yet unsoldered off broken powerbank PCBs. These:

Banggood is a bunch of @#$%, I have been forced to view the source code of the page to be able to access the image links. Makes hot linking their stuff pictures much harder, at least if you're using Chrome browser. JavaScript related crap.

Ranting aside, according to @#$% datasheet the 9926A MOSFET features… (edited all of this useless information). This means the combined dual channel resistance won't go much above 20ish mΩ even with a semi-drained cell on a hot flashlight.

Cheers

Originally posted on Fri, 10/06/2017 - 03:36; useless data fix.

User AnhTran has a little Nichia 219C 5000K R9050 sale going on, just saw his last message.

Cheers ^:)

By curiosity; how much amps/ watts does that stack solder add?

Thanks for the review. Tailcap/ switch, very good quality u-shaped tailcap and great switch

You’re most welcome Diego :slight_smile:

Jouna, setting up more 9926A MOSFETs in parallel reduces the overall RDS(ON) and increases continuous current handling accordingly for as long as the heat dissipation also improves proportionally, yet although this is not the case it is with regards to the instantaneous figures and for the continuous to some extent. With two 9926As stacked the driver should be handling 12 - 16A and optimizing the tail switch resistance and losses would be the next in line thing, imho.

Cheers

Whoa :slight_smile: I thought some improvement in output but not quite that much :slight_smile: Thanks though Barkuti :slight_smile: If and when you add that to your C8F do tell about results.

I'm smelling some sort of misunderstanding here, Jouna. Please bear in mind I said the driver should handle 12 - 16A with two 9926A chips (each chip holds two n-channel MOSFETs, thus stacking two means 4 MOSFETs), I say it just because the datasheet suggests up to 8A per chip (with a standard level of cooling we can't guarantee in such small flashlight driver PCB), not because I am predicting you'll get such a crazy amperage. If you're stacking the chips add some thermal paste over the roof of the ones below (and proper soldering, of course).

MOSFET stacking example:

AO4410 over Si4324DY units., drain terminals can be observed at the center. That little solder peak rubbing the peg is from a wire below the MOSFETs.

Cheers ^:)

P.S.: you may want to edit your previous message, I think it's missing a [/quote] thing, Jouna.

XXX-Man seems to be having current draw issues with his C8F. The triple emitter MCPCB is probably not adequate, no direct thermal path. Thermoelectric separation and/or thermoelectric separated (=DTP) copper boards these chinese folks like to say.

Cheers :-)

P.S.: leave those XP-G2s onboard for a while, kotobuki. ;-)

Thanks for your infos, I’m charging my Samsung 30Q. I will test with C8F ver “XP-G2” tomorrow.
Let’s pray :smiley:

Better? Yes, I did misunderstood. Thanks for your info Barkuti.

I am getting the C8T Jouna, mentioned it before. After witnessing this manufacturer C8F screw-up, looks like the single emitter versions have a much better chance to work right. I'll be checking out the emitter board and other details in my unit. Hope the XP-L HI comes mounted over a direct thermal path board, if not I won't be fully testing the flashlight until I can fix that. I'm serious.

Maybe the thing is already calling for an emitter swap.

Cheers :-)