Second Generation Silver Plated High Current Beryllium Copper Springs and 95+CRI SST20!

Flashlight Modding and DIY Parts
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- all good bout the LED's

- No, I don't have a temp controlled hotplate - might have to investigate getting one. I used the hot air from under the MCPCB, usually works. For driver/PCB reflows, I use a coffee mug warmer - works well, an EE friend actually gave it to me because he no longer uses it, but uses a temp controlled skillet or hotplate himself, mainly to handle bigger boards, etc.

For the coffer mug warmer, I turn it on and let it warm up a big, set the board on it and you can see the solder paste already melting, spreading, then use my hot air station at a more reasonable temp from the top while the board sits on the mug warmer.

Any recommendations and/or links appreciated for a hotplate - I'll search BLF now...

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@BlueSwordM Just checking if you got my pm?

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Ok, this looks bout perfect maybe: https://www.amazon.com/dp/B07456SPMF/ref=psdc_13838451_t1_B01LE0PD5Q?th=1

Reasonably priced, good rating, says it's a consistent heat - no cold spots, etc.

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@hodor, I’ll remove you, don’t worry.

@TomE, here’s a pic of the hotplate I use.

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Thanks. That hotplate’s seen some action.

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Yep. That’s a relatively recent botch on my part though.

The light brown/orange stuff was some flux from experimentation trying to solder my springs with a hotplate. Ended up buying a heatgun after that.

The dark brown stuff is metallic copper sludge remnants(Cu3+), an oxide. I literally can’t remove it…

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@TomE, try to visit some universities/colleges.

I actually found mine at my college last year, and it’s been so helpful ever since.

If you want some good hotplates, I can help you out.

Here’s a cheap one, and small:
https://www.aliexpress.com/item/UYUE-110-220-V-Mobilephone-Built-in-Pump-Vacuum-Metal-Body-Glass-LCD-Screen-Separator-Machine/32801227476.html

A larger one:
https://www.aliexpress.com/item/UYUE-946C-110-220V-850W-5-5-inch-Electronic-Hot-Plate-Preheat-Preheating-Station-200x200mm-for/32800325561.html

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BlueSwordM: Please could you add 10no SST-20 4k & 10no LH351D 4k, in addition to the springs on line 19 of the s/sheet?

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No problem Rusty :slight_smile:

The list has been updated:
https://docs.google.com/spreadsheets/d/18SyWGP08EpK5OOcv1vZbLokQGv1KojNW04DGz_ywSbQ/edit?usp=sharing

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Hhhmm. Guess the 100x100 size would be good enough to do least a few 17 mm drivers at a time, and can handle the biggest drivers or MCPCB's. The shipping cost is big though. I like they can go up to 200C, better than 212F (100C) max of the burners.

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I have this hotplate https://www.aliexpress.com/item/UYUE-946-1010-LED-Display-Preheating-Platform-for-Mobile-Phone-Repair-220V-110V/32954192636.html

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Good price w/shipping, not much info on it - do you know the max temp? Hoping for 200C or better.

Found other listings that say 50-350 or 50-400 -- that's good, assuming in C!

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I have used it at around 200-220C but I think the max temp is 400C.
In a few hours, when I return to my home I check it.

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So how do you like that hotplate? It looks very small and convenient, I almost bought one. What time does it take to reach the set temperature?

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@BlueSwordM , could you please reduce my query to 10 * SST20 4000/3000 (springs and 3500 K are without change)?

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Confirmed. Maximum 400C.

I like very much. Since I have it, I have not failed any led reflow.

Room temperature 27C (air conditioned).
Hotplate initial temperature 33C.
Delay until reaching the set temperature (218C) 10:44 minutes.

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Thanks, I have been thinking about this unit for several months, you just convinced me - ordered

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It's the best price as well on Ali. Others may list it cheaper but charge almost as much for shipping.

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BTW guys, I’m going to order the 3000k LEDs at the same time as the springs.

Who would like additional 3000k LEDs?

If I could actually order 250 LEDs, I could actually make them a bit cheaper than 1,50$USD/pcs.

I’m also still looking at the SST-20 4000k.