UltraFire SK98 switch replacement

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Barkuti
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UltraFire SK98 switch replacement

Mmmkay, been touting with BanL in this regard recently via PM and through KD's thread, his reply got me a bit puzzled.

0K, I can see certain switch assemblies sold together. Here the one to replace/rework:

 

 

The main thing here is the white plastic holder diameter, ≈17.1mm. The overall lenght of course is largely dependant out of the spring and the brass prong.

 

I think I've found a replacement at KD, but hell with the measurements! Let me explain:

Item: DIY LED Flashlight Reverse Clicky Switch 20mm x 24mm for LED Flashlight (5 pcs)

 

Ooouh yeah! ∅20mm… Facepalm  

 

Well, I think that's the right stuff. If anyone has something worthwhile to add, say so please.

 

Party

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Edited by: Barkuti on 07/20/2017 - 00:16
Lightbringer
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Looks similar to the pogo-stick switches I’ve seen on some ’501s and ’502s.

Try any of these?

https://www.fasttech.com/category/1610/diy-kits-parts-switches

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everydaysurvivalgear
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Yea i would try Fasttech i have seen similar switches there.

The stainless steel host i bought from KD uses the same switch style.

Angler
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Can you just reuse the plastic holder and fit an Omten1288(12mmL x 8mmW x 8mmH) in there?
Maybe shim it if necessary?

Barkuti
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Just PMed BanL with a link to this thread, let's see if he can confirm that's the right pogo-stick assembly. Indeed it looks like this one from FastTech: https://www.fasttech.com/products/1610/10019067/3962203-replacement-clicky-switch-for-led-flashlight … with copper cap. Facepalm

My problem with FastTech right now is they're trying to dodge me an UltraFire SK98 refund, they sent me a black Power Beam instead in my last shipment, and dora is asking me to keep that @#$% and accept a price difference refund. 

Told her I'll be making a mini-review of the bike light, though. 

The 5-pack price is great, too.

Can be done Angler, but I prefer to have the right part.

 

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Lightbringer
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Barkuti wrote:
Told her I’ll be making a mini-review of the bike light, though.

Good Lord B’Harni Almighty… what a HIDEOUS beam!!

Think I’d run off the road if I had that thing lighting up the path in front of me.

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Barkuti
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That sidespread stuff is not nearly as bad as it seems in the product page's picture, Lightbringer

I've already modified it LoL. Check this out:

 

 

The plastic headpiece has a sort of reflector type insert. After my first disassembly to put batteries (4 × AAA) inside, I couldn't place the head back over because the reflector insert had rotated a bit, and it was a bit stiff. I resolved by removing the @#$% with needle-nose pliers. With regards to the front plastic lens with slight recesses at each led position… another waste of time I believe. A single flat plastic lens and no reflector would have been smarter, avoiding beam corruption. The beam of standard 5mm white leds is already very tight, nearly nothing to gain with a reflector if at all.

Very simple driver board with long lead leds attached in a cross/square plus center pattern. Small integrated microcontroller unit under a white silicone bead, with an incoming red/blue wire pair for power and an outgoing blue/blue wire pair for the momentary switch. Two modes: ON and SOS. Mode cycle: ON/SOS/OFF.

Have not made measurements, but seems to be driving them at the standard 20mA. 100mA of driving current from 4S alkalines means the stuff can fully utilize them, with a runtime of at least 8-10 hours on a good set. Oh! PWM free I believe. 

Well, it's at least half done by now.

 

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Lightbringer
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Barkuti wrote:
Very simple driver board with long lead leds attached in a cross/square plus center pattern.

Quincunx.

Chee-orr! Big Smile

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Barkuti
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Lightbringer wrote:
Barkuti wrote:
… a cross/square plus center pattern.
Quincunx. Chee-orr! :D

Tip thanks. Actually I remember that term from the old days of the GeForce3 and GeForce4 Ti series graphic cards (an antialiasing mode; got a Ti4400), but guess I didn't paid much attention to its actual roots back in those days.

By the way, Chee-orr! is actually a deep bastardization of the main term spaniards use to refer to God: ¡Dios! 

 

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Anthon
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I use a stock convoy S2+ one, fitting is not perfect but it works and is way more reliable than the stock one

Lightbringer
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Barkuti wrote:
By the way, Chee-orr! is actually a deep bastardization of the main term spaniards use to refer to God: ¡Dios!

Aha. I just assumed it was an ancient Barkutian dialect of Andalusian Spanish, nowadays only spoken in hushed tones, which meant something like “Success!” or “Yay!”. Big Smile

Whups, I meant “¡Success!” or “¡Yay!”. Big Smile

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Lightbringer
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Hey, you know I can speak “¡umop apisdn!” and “¡rightside up!”?

Ha! I kill me sometimes…

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Barkuti
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Well, among the fleeting indecision let's say my comrade has agreed to first try this: Mini LED Linterna Tapa Trasera Interruptor Trasero 23mm @ reliability_king

Ought to be reliable.

 

Party

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BanL
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Hi

I had measured the switch and see this is suitable for you or not.

Plastic holder diameter: 17mm (Dia.) x 11.5mm (H)

Please see this is suitable for your SK98 flashlight or not.

Thank you

Ban

kaidomain.com KD - LED Flashlights, DIY Parts and Accessories

Inquiry for KD, please feel free to contact me.

BanL
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BanL wrote:
Hi

I had measured the switch and see this is suitable for you or not.

Plastic holder diameter: 17mm (Dia.) x 11.5mm (H)

Please see this is suitable for your SK98 flashlight or not.

Thank you

Ban

And the dimension of the switch:

14.5mm(L) x 11mm(W) x 10mm(H)

Thank you

kaidomain.com KD - LED Flashlights, DIY Parts and Accessories

Inquiry for KD, please feel free to contact me.

Lightbringer
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There ya go…

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Barkuti
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Thanks BanL, ordered a pack of pogo-stick sets, they're likely to be welcome sooner or later, seems the switch in the stock pogo-stick assembly is of inferior quality. 

 

Party

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Barkuti
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Measured the Power Beam driver current input. Starts drawing ≈0.22A to progressively diminish and stabilize at ≈0.2A in a good handful of seconds. Measured also in the 200mA scale of my meter and got ≈200mA down to a gnat's ass below 180mA. Stick with the 10A scale measurement fellows, the 200mA scale's installed fuse current specification is 1A (it's what I had to fix it). Wink

Emitters' Vf at that current after a little (≈30s) warm up time: 3.25V.

 

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