SYSMAX Ind./Clike to find more about Nitecore flashlights!
Page 1 of 4 1234 LastLast
Results 1 to 30 of 105

Thread: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

  1. #1
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Dummy reference guide to SF A2 modding with high output 5mm leds

    Hi, all!

    Got home today early for a change, after reading KevinL post about 35k led vs other leds in led section and some struggle deep within (for like, 5 minutes)--I had decided to mod the SF A2 Aviator into a hybird with 35k mcd leds.

    The result is definitely satisfying and the process is fun(but part of it is a pain in the behind).

    Swapping the leds in a SF A2 probably has been done and mentioned in the past, and the following is just some pictures and description of how a dummy do it

    Update 23/9/05--I have finally decided to switch in the MJ uncut leds into the SF A2 led swap mod. The main reason behind this is the level of overdrive a led could take--if my calculation is correct, then the 35k or original leds are driven pretty hard at 78ma.

    It might work well with the original leds, but there is an uncertainty about how much the 35k could take or how long will it last at that level.

    For me, since this light will become part of my EDC inventory, though the 35k is truly amazing in terms of its very tight concentrated beam, I cannot bear this uncertainty/risk that these leds' output might diminish over time(or in a short frame of time).

    Thus, I have decided to swap in the MJ uncut leds for the SF A2, which is more floodish but just about as bright. More pictures at the end.




    First, unscrew the led ring from the bezel. Slowly wiggle the led ring out.




    The led ring without the anode ring. This is the only painful part of the whole process, to undo the anode contact ring from the led ring. I have so much respect for the SF quality of work, even for a small piece, it is well designed and so securely attached together.




    This is the anode ring that has been taken off the led ring. You probably have to take it out to mod the leds properly. The trick is to use a solder wick to absorb all the solder off where it is connecting the anode ring and led ring. Then put the solder iron on top of the little tab and wiggle it loose from where it is...finally use a real sharp knife to slowly pill the anode ring off the led ring while heating it up with a solder iron. Be very careful since both the layout of led ring and the anode ring are both quite delicate. If you destroyed either one or damaged it too badly, there is no turning back!!

    Another easier route could be done if you just snap the legs of the original leds and solder the new one on top...but you'd better be lightning quick, since there is hardly any solder connecting the leds to the led ring.




    Swapping the leds in process. I have measured the three little SMD resistors mounted before the leds, and each is 33.3 ohm. And when I engage the first stage of the switch, the voltage supply is around 6v. So if the Vf of this 35k is around 3.4v(Got these leds from a fellow flashaholic friend, Aw), then the V drop by resistor will be around 2.6v; and the I for each led will be around 2.6v/33.3ohm=78ma each. Definitely overdriven if the spec is at 20ma nominal for most leds, but further research will need to be done for a long term effects. So far so good.

    Also, depending the leds that you plan to put in, you might have to dremel the protroding latch at the botton of the led flat, so it could fit into the led holes on the A2 bezel.




    Viola, it works! Do check the new leds that you plan to swap in before you solder them on, and double check again with supply 3 x 1.5v to the led ring.




    Another view from the back of the led ring


    Comparisons, all pictures used the same exposure and shutter speed settings:


    Original SF A2 vs Attitude



    Original SF A2 vs 26k modded Attitude



    SF 35k leds A2 mod vs Attitude, it just completely blows it out of water...and the 35k seems to be quite narrow in terms of its beam characteristics.



    SF 35k leds A2 mod vs ARC AAA rev4(with Nichia CS, Issac, thanks for the correction )

    Yet another swap
    As stated in the update at the beginning of this post, finally, I have decided to put in the MJ uncut leds. They are more capable of handling long term overdrive so as long it is under 100ma. Assuming its nominal Vf is around 3v(which IIRC, it does not have as high Vf as normal 5mms), then the drive level is about ~90ma. Here are some comparison pictures of the SF A2 with MJ leds:


    Original PT attitude, a comparable output to the original A2


    SF A2 with MJ led, this picture does not do a complete justice of the level of light it gives...but comparing it to 35k, it is quite flood-ish and the light generated is about the same(or just a little less, from my naked eyes). Still, a really good improvement over common 5mm leds(which PT attitude is comparable to the original SF A2)


    SF A2 35k leds mod, notice the beam is tight and the darker area unlit by this tight beam.


    SF A2 MJ uncut leds mod, note the flood beam also covers the unlit area not lit by the 35k. And I am a lot of comfortable with this mod, knowing this tool will perform well and I can count on it when needed to.


    Thank you for reading, hope yod have enjoyed the pix!
    Last edited by AuroraLite; 04-01-2006 at 09:19 PM. Reason: redo the calculation for I of each led and it turns out to be around ~78ma each
    Dummy Reference Guide to Minimag mod

  2. #2
    Flashaholic* leukos's Avatar
    Join Date
    Apr 2004
    Location
    Chicagoland
    Posts
    3,443

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    AuroraLite,
    Great post! I have zero soldering skills, so let me know if you would ever do this mod for other CPFers and what you would charge. I would love to have some newer LEDs put in a couple of my A2s!
    Light is sweet and pleasing to the eyes....

  3. #3
    *Flashaholic* wquiles's Avatar
    Join Date
    Jan 2005
    Location
    Texas, USA, Earth
    Posts
    8,429

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Great mod - thanks for the pictorial walk-through

    Will
    Please no PM/Visitor Msg's. Email for questions/Paypal: wquiles [at] gmail {dot} com. Please visit my new website.

  4. #4
    *Flashaholic* greenLED's Avatar
    Join Date
    Mar 2004
    Location
    La Tiquicia
    Posts
    13,244

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    I luv your Dummy guides! Thanks for doing this for those of use with limited modding skills.

  5. #5
    Flashaholic* Krit's Avatar
    Join Date
    Dec 2003
    Location
    Thailand
    Posts
    751

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    I see 100 mA LED in Dat2Zip and thinking to replace to A2'led. A2 can use with 2*r123a and still over drive stock led, so I will replace with 100 mA led to obtain more current. Now I get 100 mA led in my hand but I have no time to change it.

  6. #6
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Leukos,
    Thanks for the kind inquiry, flashaholism is mainly a hobby, and I have no idea how much should a mod like this would go for. I have heard it cost a rediculous amount for a new ring of leds(something almost the price for a new A2?), but it doesn't really require excellent solder skill and it will be silly to pay so much for a mod like that. Probably patienence and time are what one needs more for this. Anyway, if time ever permits(which is not very likely for the next few months)...keep in touch.


    Wquiles,
    No, thank you for reading!


    greenLED,
    As always, I am truly thankful for your kind support. I don't think there is ever a modder who has no skill, but just modder who hasn't discovered his/her skill. Besides, my easy mods are hardly comparison to those who had set foot and make history on CPF. My kudos to all those contributing mod masters!


    Krit,
    I redo my calculation and if my assumptions are correct about the Vf of those 35k(around 3.4v), then they are overdriven at around 78ma each. The uncut 5mm Mj leds are probably great candidates for this mod then, since it will probably still be overdriven but not to the max. Please do show us your result when you are done!
    Last edited by AuroraLite; 09-20-2005 at 05:12 AM.
    Dummy Reference Guide to Minimag mod

  7. #7
    Enlightened
    Join Date
    Oct 2004
    Location
    Hong Kong
    Posts
    33

    Evilgrin07 Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Auroralite,

    Very nice mod indeed. I guess you'll have to swap them again for the 40K mcd 5mm LED very soon since they are now available from the same manufacturer.


  8. #8
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Haha, Aw!

    Thanks for spec. At any rate, I will just keep my solder iron hot and ready!
    Dummy Reference Guide to Minimag mod

  9. #9
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Correction to first post: ArcAAA rev4 uses a Nichia CS LED. Not sure if it's a U-bin they use, but I have some U-bins that I'll be putting into my arcaaa. Now THAT's going to be hard!!

    BTW not sure why the andode ring was removed, but then again I don't have an A2. I've done 5/8 led Xnova led replacements, and once you get used to it, it's just time consuming (desoldering 16 leads, then heating up the holes 16x to slide the led in, then anothe 16 times to add more solder to finish them up!) (I can't find my desoldering braid)

  10. #10
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Quote Originally Posted by IsaacHayes
    Correction to first post: ArcAAA rev4 uses a Nichia CS LED. Not sure if it's a U-bin they use, but I have some U-bins that I'll be putting into my arcaaa. Now THAT's going to be hard!!

    BTW not sure why the andode ring was removed, but then again I don't have an A2. I've done 5/8 led Xnova led replacements, and once you get used to it, it's just time consuming (desoldering 16 leads, then heating up the holes 16x to slide the led in, then anothe 16 times to add more solder to finish them up!) (I can't find my desoldering braid)
    IssacHayes,

    Thank you for the correction, post corrected!

    The reason for removing the anode ring is because there are three tongues that sprung out from the ring as contacts to the body. And those three tongues are covering where the solder points for the three leds at the base of the led ring.

    Certainly, one could use brute force to bend those tongues backwards and try to access the leds...but I worry the fact that it will be bent out of shape permanently and even then, it would be harder to solder those leds straightly lined up and all approximately equal in height when the tongues are in the way.

    What I did after removing this anode ring is, to de-solder the leds, then replace those with three new leds that all has very identical lenght of trimmed legs.

    Afterwards, solder the new leds onto the led rings, and finally, place the led ring flat on a glass, heat up the solder point to get each of them to adjust for striaghtness and the height. As you have said, it is not a really that difficult of work, but do needs patience and time...
    Dummy Reference Guide to Minimag mod

  11. #11
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Ah I see. A2 seems like a really cool light. I'd like to see a light with luxeon & reflector, and with 5mm led all around the bezel up close by the lens. You could have a rotating collar like the U2 that would select between white led, red, green, UV, etc Crazy Idea but it'd be like every A2 rolled into one.

    I'm almost done with my ArcAAA Nichia CS swap. I had to re-solder the wires of the inductor back to the inductors SMD base(the part that is soldered to the board)!!! Actually I think the wires were originally spot welded/melted. You can see the details of it here.

  12. #12
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Isaac,

    Maybe all the flashaholics think alike? I did make some prototype of what you have mentioned(not as crazy as four colors with bezel twisiting operation, which btw, a really cool idea) with 2 leds and a luxeon in the middle. Turns out the bezel is too small for such mod, but now that you have mentioned it...I think I ought to give it another try!

    A2 indeed is a really cool light...but somehow, my local flashaholic friend and I are having conspiracy theory that maybe SF will come out with a new light, similar to A2, but with lux in the middle and different colored leds as back up/option in the reflectors...for example, Lux III or V in the middle with IR leds or red leds...SF, are you listening?

    Btw, I am thinking yet another swap for the A2 35k...maybe with the Mj led uncut this time--Krit got a really good and valid point, after some reading and researching, it seems the Mj leds are more durable in a long, long run for overdriving. What do you all think?


    I had seen the similar ARC AAA led swap in the past, and I am sure the result should be quite satisfying. Very informative thread, a future project I shall pick up in the future.
    Last edited by AuroraLite; 09-21-2005 at 06:04 AM.
    Dummy Reference Guide to Minimag mod

  13. #13
    Flashaholic makar's Avatar
    Join Date
    Nov 2002
    Location
    Stuttgart/Germany
    Posts
    394

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Great thread
    How will this modification affect the runtime compared to the standards sf version?

  14. #14
    Moderator js's Avatar
    Join Date
    Aug 2003
    Location
    Upstate New York
    Posts
    5,782

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Great thread, AuroraLite!

    Thanks for posting this.
    -Jim Sexton, creator of the M6-R, the TigerLight Upgrades, Fixture-ring lamp potting, the SL60, co-designer of the B90 Upgrade, and proponent of the SF A2, the SF M6 X-LOLA, Titanium, the Haiku, and the LunaSol 20

  15. #15
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Makar and Js,

    Thanks for reading! AFAIK, this 35k leds have a nominal Vf of 3.4v and if the original leds do have the same or similar Vf and the spec I forward as 20ma, then the runtime should remain the same or somewhat similar. From FLR site, it has stated that the leds are not regulated, so it will just drop very gradually from beginning to 50% in 15 hours.

    Actually, what I'd like to know is whether there is a way to guesstimate as how many hours of leds usage is equal to incan usage for the A2?
    Dummy Reference Guide to Minimag mod

  16. #16
    *Flashaholic* IsaacHayes's Avatar
    Join Date
    Jan 2003
    Location
    Missouri
    Posts
    5,876

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Auroralite - Perhaps take one of those cheap china lights on ebay/etc that have like 32 or whatever LEDs in them. Get one that has a side clicky switch. Swap the switch for a 2 stage switch like people do for the QIII. (only this one will be on the side barrellel, so you can wire up it to switch between 5mm and luxeon, instead of a resistor). Then hack out the LED board and leave only the outermost ring of LEDs. Then find a reflector (IMS?) 17mm/20mm/27mm etc that fits in the center. Get some aluminum and mount an emitter and grind it to fit in the head. Drill holes for wires, Wire up the 5mm ring, and the luxeon. drop in the reflector, Artic Aluminua/silver Epoxy the aluminum HS into the head, solder the wires to the 2 stage switch. And there you have a dual 5mm/luxeon home made light! I'll leave the color of LEDs (and rotating collar LED selector) up to you to figure out! Actually 360nm fox UV would be cool in a A2....

    As for swapping out the 35k for MJLED, well those are speced at 100ma or so, so I'd think they'd tolerate the higher "overdrive" levels of the A2 better, and perhaps make more light (they have a wider beam angle) too. That or put some Nichia CS U-rank LEDs in. Those would be just as bright/brighter than the 35k and at over drive levels they don't dim down/fade like the 35k does over time.

  17. #17
    Flashaholic* Krit's Avatar
    Join Date
    Dec 2003
    Location
    Thailand
    Posts
    751

    Thinking Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    I carry A2 along the beach at night and the led light is not enough for my safety walking. I found sea snake at beside the beach, and difficult to see what it is. I step over the snake and I just know that it is not the string.

    I come back and think A2 is the multipurpose light for me and led mode is just suit for camp life or close up work. It's not suit for safe walk in total dark area which we do not clear enough.

    I see the uncut 100 mA MJled and think the way to mod to the brighter led mode for A2. This should be the A2 which best for me and I can use other mini led in latent area instead.

  18. #18
    Flashaholic* Krit's Avatar
    Join Date
    Dec 2003
    Location
    Thailand
    Posts
    751

    Sigh Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    AuroraLite, I do not change my A2's led yet. I have every thing in my hand now but I'm in my hard luck from termite in my house. :-(

  19. #19
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    Krit,

    I managed to put 3 Mj uncut led with 40 ohms each, powered by 4x1.5v batteries to simulate the 3 leds ring in A2. The result is a splash of creamy white light. I think I am at an intersection to decide whether to keep those 35k in the A2, knowing that it is quite overdriven and destined to diminish overtime, or simply to put in the 3 Mj leds. The pros about the 35k over the Mjs is that it does give a very concentrated beam shot(like behind an optics) vs Mj's 'wall of light'...current 5mm leds inherently will be no where near as bright as the current lux, and the focused beam pattern does have its appeal over a flood light for me.

    How would you all choose if you are in my shoes?

    Btw, take your time, Krit, no worries or anxiety attack!
    Dummy Reference Guide to Minimag mod

  20. #20
    Flashaholic* Krit's Avatar
    Join Date
    Dec 2003
    Location
    Thailand
    Posts
    751

    Default Re: Dummy reference guide to SF A2 modding with 35k 5mm leds

    AuroraLite, in my opinion, propose of use is major decision supporting. I think the stock led is not throw enough for walking so I will change to uncut MJ for good throw as I rough test.

    For your objective, 35K led makes a smooth plenty light in close up use. So, if the led cost is not too high. You can change them after diminish.

    Thanks for your auxiliary.

  21. #21
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    Krit,

    I finally swtich the 35k leds to MJ uncut leds for the SF A2. It is a decision mostly based on reliability, since this light will become part of my regular EDC inventory and I cannot bear in mind that uncertainty/possibility that its output might diminish over time.

    The result is just as impressive, more flood this time and remains a significant improvement over the original SF A2.
    Dummy Reference Guide to Minimag mod

  22. #22
    *Flashaholic* KevinL's Avatar
    Join Date
    Jun 2004
    Location
    At World's End
    Posts
    5,801

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    Whoa.... I was just going to say "hold your decision" because I might have something next week for you.

    If you think the 35Ks are impressive.. just wait

    But good point, the reason why I am not even modifying my A2 at all is that it is a light I need to depend on. I don't think my own skills are good enough to provide GUARANTEES, compared to the automated assembly lines and extensive testing SF does.
    Celebrating the ROP.. 5 years of history

  23. #23
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    KevinL,

    Haha...if you have something good up your sleeves, I am all ears(or hands)!
    The reliability is a real issue, and I think any SF buyers will acknowledge that when they make their SF purchase. And that is the reason why I have not only one or two A2s with me...before I am bold enough to mod this one.

    Meanwhile, I will keep my solder iron hot and ready!

    Btw, what's the verdict as the best solution for a rechargable A2s? I have read from your cool thread about 'A2 convert', and will the 2x3v li-ion rechargable be the best/safest option? I am still not ready to risk this light with 2xR123 just yet...
    Dummy Reference Guide to Minimag mod

  24. #24
    *Flashaholic* KevinL's Avatar
    Join Date
    Jun 2004
    Location
    At World's End
    Posts
    5,801

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds



    You guys will find out the exact nature of the beast next week when I get my first look at it. More than one A2 - you are a flashaholic indeed! The only modded SFs I keep around are my collector's editions. My KL1-SG has a new RY0J LED for example, but my working KL1-HA has its original yellowish LED. Much as I dislike the tint..


    Anyway, still driving my A2 on 2xCR123. Regulation helps take away the pain because the light remains brilliantly white till the cells are ready to die. If I think I'll be using the light for extended periods of time, I bring my U2 instead with its 18650 high cap lithium ions.
    Celebrating the ROP.. 5 years of history

  25. #25
    *Flashaholic* wquiles's Avatar
    Join Date
    Jan 2005
    Location
    Texas, USA, Earth
    Posts
    8,429

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    AuroraLite,

    I got my A2 today and as I expected, the "normal" LED's that come with it have that awful "angry blue" tint which I hate so much (too used to the Luxeons, I suppose).

    Which of these mods that you have done you feel gives you the closest to true "white" tint? From the pictures I would guess the uncut MJ's, but wanted to ask to be certain.

    Will
    (A2 ready to be LED modded!)
    Please no PM/Visitor Msg's. Email for questions/Paypal: wquiles [at] gmail {dot} com. Please visit my new website.

  26. #26
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    Hi, Will.

    Haha...another A2 modder!

    Actually, believe it or not, the 'whitest' I have ever seen is actually 3 26ks Chinese leds put together in a PT attitude mod that I have done. It is like the X0 tint driven at 750. Not warm, not cold, just perfect.

    But the only worries I have about is its dimishing output when overdriven as featured in the 'Head to head' thread. And that is why I have went for the MJs, it is a little creamy and a very slight hint of green, but heck, it is such a huge improvement over the original angry blue/purple that it is well worth the effort.

    The most 'throw' actually comes from the 35k, but as I have mentioned in the thread, I'd worried about it's long term unknown performance when overdriven at ~80ma, and it is angry blue like the originals. But the beam it so tight that it actually can throw a little.

    Btw, I took out the A2 with MJ leds for a night hike in pitch dark, it is really a cool 'tool' since I can identify/see pretty well within 20+ feet with the leds, and the incan could lit up the path if the throw is needed. And for close up work, the leds are really bright and quite comfortable to read with.

    Anyway, good luck to your mod, and show us your mod when it is done!
    Dummy Reference Guide to Minimag mod

  27. #27

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    Sorry about being off topic. Have some newbie questions about poor mans A2, the TT 2L. I just have a little experience with mods. Modded a SL keymate with MJLED which is sweet. I put Dorcy Spyder bulb in my TT 2L and would like to replace the 3 led's in TT2l also. Any advice on TT 2L mod? Which would be better Nichia CS or MJLED's? Would I have to put in any resisters or just solder in new led's?

  28. #28
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    Farscape105,

    This TT2L project seems to be a fun one, and unfortunately I don't have one to give you straight answers, but...

    1) Are the original leds setup parallelly or in series?

    2) Are there any resistor(s) soldered with each/group of the leds? What are their/its value? And how are their setup(one resistor for each led, or one resistor to a group of paralleled leds, etc)?

    3) MJ is a bright flood of light(mine has a very small hint of green/yellow, but overall it is a huge improvement on the angry blue tint. But if you like more 'throw' or concentrated beam, seems like the Nichia is a better choice. And depending which one you like better, we might have to solder in a resistor(SMD or regular, depending the room we have) in the mod if it is directly driven by the 2 Li batteries.
    Dummy Reference Guide to Minimag mod

  29. #29
    *Flashaholic* wquiles's Avatar
    Join Date
    Jan 2005
    Location
    Texas, USA, Earth
    Posts
    8,429

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    AuroraLite,

    I am almost ready to modify my A2 - I am too tired of the angry blue tint!.

    Some additional questions:
    - Regarding the LED's, how are they wired? Series or parallel?
    - Assuming parallel, are the batteries (2x3V) driving each LED individually with a current limiting resistor?
    - You mentioned 40ohms above for the MJLED - what was the stock value?

    Thanks in advance,

    Will
    Please no PM/Visitor Msg's. Email for questions/Paypal: wquiles [at] gmail {dot} com. Please visit my new website.

  30. #30
    Flashaholic* AuroraLite's Avatar
    Join Date
    Nov 2004
    Location
    HK
    Posts
    850

    Default Re: Dummy reference guide to SF A2 modding with MJ led (or 35k 5mm) leds

    Quote Originally Posted by wquiles
    AuroraLite,

    I am almost ready to modify my A2 - I am too tired of the angry blue tint!.

    Some additional questions:
    - Regarding the LED's, how are they wired? Series or parallel?
    - Assuming parallel, are the batteries (2x3V) driving each LED individually with a current limiting resistor?
    - You mentioned 40ohms above for the MJLED - what was the stock value?

    Thanks in advance,

    Will
    Hi, Will.

    The original leds each has a 33.3 ohm resistor soldered in front, and each set of resistors and leds are wired parallel with each other.

    The spec of the 'uncut' MJs are found as the 5mm 100ma as in the following ISP:

    http://www.powerleds.com/

    Thanks to Wayne(btw, can you tell I am a total dummy in EE), he had told me the sweet info about these leds, and that it might have degradation as shown in 'head to head' thread if we go above or close to 100ma.

    Earlier in the thread, I had the calculation as ~90ma to each of the MJs(assuming its Vf is around 3v)in theory.

    Yet, I had recently ran a very identical setup of 3 sets of MJs and each as a 32ohm(22+10) in front of it, on a bread board.

    Driven by 4x1.5v(6.2v measured) alkaline, IIRC, the numbers of ma was much smaller, something around 50ma to each MJ. Certainly, a 2x123 probably might yield a higher current, but it is more likely that the current should still be within the safety limit of 100ma.

    And that was what I did to my swap, just the MJ leds with no change on the resistor values. So far, after a few sets of batteries, it continus to work like a charm.

    Good luck to your mod!
    Last edited by AuroraLite; 10-11-2005 at 10:33 AM.
    Dummy Reference Guide to Minimag mod

Page 1 of 4 1234 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •