Resistor Ring




"I Can't Resist Lovin' You"
Thanks guys!

This is an Instructable on making a ring out of four (4) resistors and three (3) LEDs. This simple project is the perfect thing for your geek girlfriend with Valentine's Day coming up.

Things needed for this project:
~Four (4) resistors (I used 220k-ohm 1/2 watt, 5% ones because of their red and gold stripes.)
~Three (3) LEDs, 1 normal sized one, two smalls. (Dead or working, it doesn't matter.)
~Soldering Iron
~Sandpaper or Dremel with sanding bit

Please rate this if you like it! Thanks.

Please vote for me in the book contest if you enjoyed this Instructable! Thanks!

Step 1: Do the Resis-twist!

Once you have everything, you want to get the general measurement for the ring. Twist the ends together as shown in the picture. Once that's done, measured, fitted, and all that jazz, heat up your soldering iron and get to work. Flux up the corners and move onto step 2....>>>>

Step 2: Soldering

Hold the resistor ring together with some alligator clips when soldering. Make sure to follow soldering guidelines, seen here in the "How to Solder" group. After it is secure, clip off the extra wire, moving onto step 3 -->>

Step 3: Adding the LED Gems & Finish!

Well, this doesn't look very pretty right now, so, let's add some flair. Add the bigger LED first, twisting the wire around the ring. Flux it up, solder, snip the wires, and repeat for the smaller ones.

After that, whip out your sandpapering device of choice and make everything nice and smooth. Voila! You're very own, DIY, resistor ring!

Participated in the
The Instructables Book Contest



    • Growing Beyond Earth Maker Contest

      Growing Beyond Earth Maker Contest
    • Frozen Treats Challenge

      Frozen Treats Challenge
    • Classroom Science Contest

      Classroom Science Contest

    36 Discussions


    7 years ago on Introduction

    no they not led free my local electronics store still sells leaded solder :)


    7 years ago on Step 3

    It would be nicer if you could turn it on!


    8 years ago on Step 3


    Are you using non-lead solder?

    Lead can be absorbed by the skin, and it is very poisonious.......


    8 years ago on Introduction

    Your flux best friend has a bad color! usually its white!


    9 years ago on Introduction

    so nice about my version, made 5 or 6 years ago ? mine can be adjusted to any size of finger, and are simple and (i think) elegant. any constructive comment can be sahred here or to sorry for the photo quality, if you want more photos just emailme please


    9 years ago on Introduction

    put a transistor through there so that when base and something else makes contact, the led lights up.


    11 years ago on Introduction

    Add some lithium cells & u have a glowing ring!!!:)

    bug 8

    11 years ago on Introduction

    thats cool! it would be even cooler if it lit up.


    11 years ago on Introduction

    This is so awesome!! Finally something easy and fun to do with all the resistors and LEDs i have lying around.

    1 reply

    12 years ago

    Touching lead for a little while won't do much damage to you, even if you stick your fingers in your mouth afterwards. Lead is much more poisonous in gas form (solder fumes) and when dissolved (like in alcohol when medieval people drank wine from lead cups). Simply touching it won't kill you. It's a typical case of people going nuts over something thats not that dangerous, within limits, kinda like the flu virus..... The instructable is kinda cool though, I proposed to a girl in grade 6 with a ring made of copper! ahhhh...the good old days.

    2 replies

    Reply 12 years ago

    I don't see anyone going nuts -- its just a matter of exposure. If you had the choice of exposing yourself to something that is dangerous - would you? I can cite my father as a perfect example -- the chemicals he uses for work are not dangerous if exposed for short periods of time. And he's only exposed for short periods. But over the 35+ years, the neurological damage is evident (short term memory). I'm sure this ring won't cause any immediate effects (unless it was eaten -- sharp points :P) - but really, why add yet another potential straw to the camel's back? All of our efforts let you open the pickle jar ;)


    11 years ago on Introduction

    Why not add a few tiny watch batteries, and actually have the LEDs light up as well? As for lead or other heavy metal exposure - you could embed the entire thing in plastic, or even just put a few layers of nail polish over it...


    12 years ago

    I was going to call it ugly, but on second thought, it might be cooler if it used more resistors with less wire in between...

    1 reply

    Reply 12 years ago

    Yea, that'd be pretty cool! If you make one, let me know, I'd like to see it or any improvements.


    12 years ago

    Please pardon my english =)

    RoHS Restriction of Hazardous Substances Directive
    Does not mean lead free.

    It means that a maximum concentration of 0.1% by weight of homogeneous materials for lead, mercucy, hexavalent chromium, Polybrominated byphenyl and polybrominated diphenyl ethers and 0.01% of cadmium shall be tolerated

    Also there are RoHS Exemptions which can have lead and others and still pass RoHS because it's exempt.

    A part can be RoHS and not Lead Free compliant. It contains lead or it doesn't but cannot be solderer or reflowed (depening if surface mount or thru hole)
    at lead-free temperatures.

    Quote frome westfw
    "The recent "RoHS" European thing means you can now buy components whose leads are tinned with lead-based solder" <-- actualy it's the opposite Lead-Free based solder.

    RoHS websites like
    BTW European RoHS is not the same as Chinas RoHS
    which is due soon
    Now lead free doesn't mean non toxic btw

    The average solder type used by DIY'ers is SnPb...Tin lead usualy 60/40
    (60 % tin and 40% lead) or 63/37 (63% tin and 37% lead.)

    Now knowing lead is toxic yes it's not a good idea to touch it and eat or
    put your finger in your mouth without washing your hands. Other issues
    come to mind, like active rosin flux core (also toxic). Flux is that
    magical little acid that permits your solder to stick (It cleans away
    oxidation and other craps and lets you solder). Water solubale (VOC free),
    No-Clean, alcohol you name em there all bad for you.

    Next thing your typical PB-Free (lead free) solder is usualy
    Tin-Silver SnAg3.5

    Tin-Silver-Copper SnAg3.9Cu0.6 or SnAg3.0Cu0.5 or SnAg4.0Cu0.5 or

    Tin-Copper SnCu0.7
    Tin-Zinc SnZn9
    Tin-Antimony-Zinc SnZn8Bi3
    Tin Antimony SnSb5
    Tin-Silver-Copper-Antimony SnAg2.5Cu0.8Sb0.5
    Tin-Indium-Silver-Bismuth SnIn8.0Ag3.5Bi0.5
    Tin-Bismuth-Silver SnBi57Ag1
    Tin-Bismuth SnBi58
    Tin-Indium SnIn52

    Most people don't believe this but Copper is in fact toxic.

    "Thirty grams of copper sulfate is potentially lethal in humans. The
    suggested safe level of copper in drinking water for humans varies
    depending on the source, but tends to be pegged at 1.5 to 2 mg/L."

    And organic tin is also toxic...mind you in solder you won't see that =)

    "The small amount of tin that is found in canned foods is not harmful to
    humans. Certain organic tin compounds, organotin, such as triorganotins
    (see tributyltin oxide) are toxic and are used as industrial fungicides
    and bactericides."

    Bismuth is unusual in that its toxicity is much lower lead, thallium and

    Pure indium in metal form is considered non-toxic. In the semiconductor
    industries, where indium exposure is relatively high, there have been no
    reports of any toxic side-effects.

    Zinc is also toxic. Even though zinc is an essential requirement for a
    healthy body, too much zinc can be harmful. Excessive absorption of zinc
    can also suppress copper and iron absorption.

    And the last one is antinomy...this is some bad's toxicity is
    similar to ARSENIC!!! hum....yeah.

    In any case you would strongly consider not using any solder to give to
    kids to play with.

    I've been in the industry for a few years and we have rules and certain
    guide lines. Kids don't usualy like rules and guide lines =)

    1 reply

    Reply 12 years ago

    I was going to say what about the lead? but you REALLY said it.