Help with resistors for resistor mods

beam0 · 2018-04-26T03:30:19.000Z

Agro:

Sugested size/values for sense resistor "kit" ??

Thanks Argo, that’s a great help! Don’t know why I missed that thread in my searches here, the link L4M4’s posted looks good!

moderator007 · 2018-04-26T03:49:35.000Z

From my experience the 1206 is the more common size. I have only seen one or two drivers use a 805.
I don’t know a thing about this company but it is a link to what you ask for.

https://www.aliexpress.com/item/200PCS-1-1206-SMD-resistors-assorted-kit-set-10-valueX20pcs-200pcs-1R00-R820-R750-R620-R500/32843255843.html?
.
The 2512 is quite large, Twice the size of the 1206. I haven’t seen one used but with some of these newer high powered drivers I guess it’s possible. You could just order 805, 1206, and 2512.
Might be useful.
http://www.resistorguide.com/resistor-sizes-and-packages/
PARALLEL RESISTOR CALCULATOR

Agro · 2018-04-26T04:27:57.000Z

moderator007:

From my experience the 1206 is the more common size. I have only seen one or two drivers use a 805.
I don’t know a thing about this company but it is a link to what you ask for.

Page Not Found - Aliexpress.com?

Aren’t those too resistive?

beam0 · 2018-04-26T04:53:19.000Z

I found this kit too for the 1206: https://www.aliexpress.com/item/800pcs-Package-1206-SMD-Resistor-Mix-Kit-0-2M-40-Kind-Each-20pcs-5/32799364326.html?spm=2114.search0104.3.29.2a712da6buOgEP&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10709_10151_10344_10068_10130_5722815_10324_10342_10547_10325_10343_10546_10340_10341_10548_5722915_10545_10697_5722615_10696_10084_10083_10618_10307_10710_5722715_5711215_10059_308_100031_10103_441_10624_10623_10622_5711315_5722515_10621_10620,searchweb201603_25,ppcSwitch_2&algo_expid=159974aa-356f-47f5-a4ac-985b07f444cd-4&algo_pvid=159974aa-356f-47f5-a4ac-985b07f444cd&priceBeautifyAB=0

Kit #: 1206 43R-560R

25 Values Each 20pcs total 500pcs
43R 47R 51R 56R 62R 68R 75R 82R 91R 100R 120R 150R 180R 200R 220R 240R 270R 300R 330R 360R 390R 430R 470R 510R 560R

(I bold/underlined some values I’m used to seeing here)

beam0 · 2018-04-26T04:56:20.000Z

TBH I did think those 2512’s looked HUGE!

If I’m correct an R250 is .250 ohms or 1/4 ohm?

Agro · 2018-04-26T04:57:59.000Z

beam0:

I found this kit too for the 1206: Page Not Found - Aliexpress.com

Kit #: 1206 43R-560R

25 Values Each 20pcs total 500pcs
43R 47R 51R 56R 62R 68R 75R 82R 91R 100R 120R 150R 180R 200R 220R 240R 270R 300R 330R 360R 390R 430R 470R 510R 560R

(I bold/underlined some values I’m used to seeing here)

No, R100 (which you’ve seen here) is different from 100R

eepower.com

Resistor SMD Code | Resistor Standards and Codes | Resistor Guide

What are SMD Resistors? SMD resistors on a printed circuit board. Image used courtesy of TE Connectivity SMD stands for Surface Mounted Device. An SMD is any electronic component that is made for…

beam0 · 2018-04-26T04:59:17.000Z

Agro:

Aren’t those too resistive?

you mean the values are higher than what we would use? I see R100, R150, R220 in that kit, those do sound familliar from some of the resistor mod threads I’ve read.

beam0 · 2018-04-26T05:02:40.000Z

The 1206 kit I linked is only $2.69… https://www.aliexpress.com/item/800pcs-Package-1206-SMD-Resistor-Mix-Kit-0-2M-40-Kind-Each-20pcs-5/32799364326.html?spm=2114.search0104.3.29.2a712da6buOgEP&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10709_10151_10344_10068_10130_5722815_10324_10342_10547_10325_10343_10546_10340_10341_10548_5722915_10545_10697_5722615_10696_10084_10083_10618_10307_10710_5722715_5711215_10059_308_100031_10103_441_10624_10623_10622_5711315_5722515_10621_10620,searchweb201603_25,ppcSwitch_2&algo_expid=159974aa-356f-47f5-a4ac-985b07f444cd-4&algo_pvid=159974aa-356f-47f5-a4ac-985b07f444cd&priceBeautifyAB=0

20pcs. each value, (25 values in the kit) including these 75R 82R 91R 100R 120R150R 180R 200R 220R

Only they’re 5% instead of 1%, is the tolerance too low?

moderator007 · 2018-04-26T05:06:03.000Z

The smallest is R100. If it was using a R100 then piggy backing would give you R050. Add another for R033.
For some drivers yes they might be to high, they could be already in the .05 or .025 range adding a .100 will increase the current but not by much.
You might buy some lower value resistors separately. Once you get so low you might as well just bridge it, but that will depend on the driver and if the led can stand it.

moderator007 · 2018-04-26T05:09:54.000Z

beam0:

The 1206 kit I linked is only $2.69… Page Not Found - Aliexpress.com

20pcs. each value, (25 values in the kit) including these 75R 82R 91R 100R 120R150R 180R 200R 220R

Only they’re 5% instead of 1%, is the tolerance too low?

Those are all way to high in value. You need resistors with a R in front of the number.
R100 = .100 ohm
100R = 100 ohm

beam0 · 2018-04-26T05:09:29.000Z

Agro:

No, R100 (which you’ve seen here) is different from 100R
http://www.resistorguide.com/resistor-smd-code/

Oh, didn’t know thanks for the link, so R150 is .150 ohms and 150R is 150 ohms. Yeah big difference!

so we want the ones with the R first

moderator007 · 2018-04-26T05:20:27.000Z

I wish I could find a kit that contained some of the lower values but I’m not having much luck.
I buy mine from digikey and get exactly what I need. Price decreases a little as you purchase in quanity.
Fasttech use to be the place that had a good cheap selection but their discontinued now. :confounded:
You probably remember this from the NiteNumen thread.

.
Top left R250 = .250

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The pill is held in by one T5 screw that’s located under the usb charger cap. Unscrew it and then the bezel, take the reflector out and you should see the led. The usb cap has like a plug on the end of it, you will need a small screw driver to push the plug back through the small hole in the head. Once thats out, take a long screw driver and push from the tail cap end on the + side of the driver. The pill will slide right out the bezel end. Switch side. [image] . Usb charging side. [image] …

beam0 · 2018-04-26T05:25:22.000Z

Yes that’s what started this You said it’s a 1206.

I wonder if we could just bridge it?

moderator007 · 2018-04-26T06:14:35.000Z

I don’t really know. The RX6810 has a current limit, I couldn’t read the chinese data sheet to find out what that was. Just figured it could stand a little more since the designers usual allow a little head room.

Satan · 2018-04-26T11:55:20.000Z

It is very difficult to find smd 1206 with small resistance something like R050 R030 R020 from China , any idea ?

Agro · 2018-04-26T12:14:28.000Z

I searched some time ago and R068 was the lowest I found:
https://www.aliexpress.com/item/1206-SMD-resistor-0-068-68Ohm-1-R068-100-good-10PCS-LOT/32827873804.html

moderator007 · 2018-04-26T13:26:51.000Z

I contacted a china seller on ebay that has a 2512 kit with everything a modder needs in the smaller value department, Except the size.
I ask if they could get this same kit in 1206. I’ll post up what I find out.

cu42 · 2018-04-26T19:22:39.000Z

Thanks. I will keep an eye on this thread. I have some here from other projects, but all high to use. If I know myself, it will be hard for me to not mod any of my lights if I spend any more time on here. Might as well be ready!

cu42 · 2018-04-26T19:25:24.000Z

Agro:

Sugested size/values for sense resistor "kit" ??

Thanks! This looks like the winner

beam0 · 2018-04-26T23:31:25.000Z

moderator007:

I contacted a china seller on ebay that has a 2512 kit with everything a modder needs in the smaller value department, Except the size.
I ask if they could get this same kit in 1206. I’ll post up what I find out.

Sounds good, thanks.