Cheap 1% tolerance ressistors 200 pcs for only 0.99 usd - Page 1
Forum section: electronics / general

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 03, 2013, 11:07:07 pm
content: This seller offers many values and very cheap i can tell .Take a look on what i am talking about.(Fast Delivery (at least for Greece) and very good Feedback as well as product quality) I am a beginner so i am sorry for any mistakes i did by talking about the product quality.Tell me what you think about this.http://www.ebay.com/itm/Lot-200-PCS-1-4W-Metal-Film-Resistors-1-10-47-100-470-680ohm-1K-10K-100K-1M-10M-/330817149255?pt=LH_DefaultDomain_0&var=&hash=item4d063d1947Modified due to a mistake i made.

author: Skimask
author_rank: Super Contributor
timestamp: January 03, 2013, 11:46:30 pm
content: Might be 1% resistors, but what's their tempco? And aging characteristics?1% at 25C when they're brand new...maybe...But what about next year, when it's near freezing? Or hotter than hell?

author: Smokey
author_rank: Super Contributor
timestamp: January 04, 2013, 12:18:11 am
content: If you check digikey for 1/4W 1% resistors, the 5000 piece price (bandoleer) is about 0.01USD with the cheapest being 0.008USD.Now if you look up 5% the 5000 piece price drops to about 0.005USD with the cheapest being 0.004USD.I wouldn't put my money on those actually being 1%. Someone should buy a bunch and do a statistical analysis.And like skim said, that completely ignoring all the other specs like tempo.

author: helloworld922
author_rank: Regular Contributor
timestamp: January 04, 2013, 12:44:28 am
content: I doubt that they'd take the time and effort to filter resistors so you're 5% resistors will always be at least 1% out of tolerance. Testing takes time and for something that's being produced at sub-1 cent unit cost just doesn't make sense to test every unit.Dave had some videos where he verified that the resistors he got followed a Gaussian distribution, and some of the resistors I have measure resistances close to nominal values (even the cheapo radio shack ones).

author: cwalex
author_rank: Frequent Contributor
timestamp: January 04, 2013, 11:18:25 am
content: the leads on all the ebay resistors I have bought in the past have always been really thin and flimsy. None of the leads on the resistors from the major distributors have had this issue and the prices weren't that much different from memory.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 04, 2013, 03:03:27 pm
content: Got it thanks guys!!!! but ebay is my first option for buying components online.Please suggest me some websites to buy good quality (cheap if possible) components.

author: Unknown
author_rank: Unknown
timestamp: January 04, 2013, 03:18:52 pm
content: For good quality components, the best place is the major distributors like Digikey, Mouser, Newark/Farnell/Element14 and RS Components. This is not an exhaustive list. Depending on where you live, shipping costs may be free if you spend a certain amount, affordable or expensive.

author: M. András
author_rank: Super Contributor
timestamp: January 04, 2013, 05:49:33 pm
content: but dont forget to mention if you want to reach the same pricing as on ebay you must buy whole reels etc otherwise it wont be so cheap

author: Unknown
author_rank: Unknown
timestamp: January 04, 2013, 06:22:37 pm
content: You sometimes get what you pay for; you always pay for what you get.

author: nctnico
author_rank: Super Contributor
timestamp: January 04, 2013, 06:30:40 pm
content: Quote from: M. András on January 04, 2013, 05:49:33 pmThe price for components like resistors and capacitors is so low nowadays that I pay 0.002 cents more for branded parts from Farnell instead of their own Multicomp brand.

author: M. András
author_rank: Super Contributor
timestamp: January 04, 2013, 08:08:46 pm
content: im a bit dissapointed on the farnell pricing on the hungarian site. they charge our vat too which makes it more expensive. i can buy the same damn resistor far cheaper in 1 of the biggest electronics store in Budapest to exact part number then the prices at farnell for sub 200 peices so as from digikey. i have no problem on the discount idea on volume buys but when you need few tens of quantity and it goes for 30X the volume price at their site its annoying, i dont know they do charge our vat on top of the brittish vat what they are using as a brit company? otherwise i dont get the price difference between the brit site and the hungarian

author: mianchen
author_rank: Regular Contributor
timestamp: January 04, 2013, 09:34:43 pm
content: I've bought a few thousands (4000ish) of these resistors (assortment of 100 each, total =£8, not from the exact same seller, but I guess they are all similar OHL stuff). They have very thin leads, you can see from the photos of that ebay listing, which can be annoying when breadboarding. They are ok otherwise for hobbyist needs, especially if you want to have most values of resistors in your inventory and don't want to spend a lot to buy them from farnells etc. One thing I notice is that their actual values are lower than their nominal ones (I remember Dave has done a video reviewing them). I just measured 20 of 1k resistors (Fluke 87 and HP3468A 2 wire, almost identical readings, so I just list the fluke readings), here's the readings:0.983k 0.2%0.993k 0.8%0.979k 0.6%0.990k 0.5%0.980k 0.5%0.978k 0.7%0.981k 0.4%0.991k 0.6%0.984k 0.1%0.975k 1.0%0.986k 0.1%0.983k 0.2%0.984k 0.1%0.987k 0.2%0.982k 0.3%0.983k 0.2%0.979k 0.6%0.996k 1.1%0.996k 1.1%0.987k 0.2%the second column is how much % is different from the calculated average value (0.985k).If I want to buy cheap resistors, I just buy 1206 or 0805 SMD ones in 100 off quantity (often from Rapid Online or ebay), they are much cheaper and not that difficult to solder, if I make my own PCB, I don't need to drill holes either. Anyway, I'm just a hobbyist.

author: mianchen
author_rank: Regular Contributor
timestamp: January 05, 2013, 11:49:43 am
content: Why is everyone telling a beginner to buy reels of resistors? Yes they are cheap at price per piece but if you want to have 30 values, are you gonna buy 30 reels?

author: JuiceKing
author_rank: Regular Contributor
timestamp: January 05, 2013, 12:01:47 pm
content: If you are looking for an assortment of 1% resistors for breadboarding, I can recommend these:http://www.amazon.com/Joe-Knows-Electronics-Value-Resistor/dp/B003UC4FSS/ref=sr_1_2?ie=UTF8&qid=1357386991&sr=8-2&keywords=resistorsFor $18 for 840 resistors (10 ea. of 84 1/4W standard values from 0R to 10M), you get a wide range of values and enough of them for initial stocking. The resistors have been fine.Best part is that they come in labeled baggies so you can keep them in the box for quick access and don't need to create another storage system.- Ken

author: nctnico
author_rank: Super Contributor
timestamp: January 05, 2013, 12:04:05 pm
content: Nobody is saying he should buy reels. The only 'problem' is that the components are so cheap that they are often sold in multiples of at least 50 or even 100 pieces. So buying 30 values may get you 3000 components.

author: Unknown
author_rank: Unknown
timestamp: January 05, 2013, 12:46:46 pm
content: Quote from: mianchen on January 04, 2013, 09:34:43 pmSo the average is about 1.5% off nominal. If the resistors were distributed according to a normal distribution with mean 0.985 kOhm and standard deviation 6 Ohm, about 10% would be more than 1% off from the .985 kOhm mean. These are clearly not 1% resistors, regardless of the nominal value.I would also be curious about the temperature coefficient. I have seen some OHL supposedly 1% metal film resistors that were clearly carbon film, because the tempco was way too high for metal film (about an order of magnitude higher).

author: ftransform
author_rank: Frequent Contributor
timestamp: January 05, 2013, 01:44:41 pm
content: I got thishttp://www.amazon.com/Metal-Resistor-Assorted-Value-3700pcs/dp/B00871VGX4/ref=sr_1_2?ie=UTF8&qid=1357393427&sr=8-2&keywords=resistor+kit+values

author: Monkeh
author_rank: Super Contributor
timestamp: January 05, 2013, 01:51:29 pm
content: Quote from: mianchen on January 05, 2013, 11:49:43 amWell if you're happy working with 0805 or 1206, that's 18p or 32p for a reel of 100 from Rapid.

author: mianchen
author_rank: Regular Contributor
timestamp: January 05, 2013, 02:55:47 pm
content: Quote from: Monkeh on January 05, 2013, 01:51:29 pmI've got most of my 1% 1206 from Rapid...but also bought this from eBay too:You can buy their boxed and labelled versions, a bit more expensive, but nicely sorted in little component boxes:for my really low usage, this many components are a bit overkill, but I hate shopping around just for a couple of passive components for every small projects I built, ever since I was a kid (had to do that then, couldn't afford to buy large quantity).

author: cwalex
author_rank: Frequent Contributor
timestamp: January 06, 2013, 01:07:15 am
content: What I do is whenever I need parts for a particular project I just buy 100 or so of a value for resistors and some other kinds of passives if the prices are good at that qty. example here:http://au.element14.com/multicomp/mcmff04ff1000a50/resistor-metal-film-100-ohm-400mw/dp/1602162you get a datasheet and its only $2.20AUD for 100. After a while you build up a nice collection of decent quality parts.Scrape off the enamel coating to see if they are actually carbon film resistors.

author: ftransform
author_rank: Frequent Contributor
timestamp: January 06, 2013, 09:17:38 pm
content: Quote from: cwalex on January 06, 2013, 01:07:15 amExcellent mine are real.

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 07, 2013, 02:46:35 pm
content: Thanks for your help guys from now on i will read the data sheet before buying resistors

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: January 07, 2013, 03:30:23 pm
content: Hi,My advise for a beginner would be to buy some thing like this:http://www.ebay.com/itm/1-4W-Metal-Film-Resistor-Assorted-Kit-1-112ValuesX10pcs-0-25W-resistor-kit-DIP-/200872072498?pt=LH_DefaultDomain_0&hash=item2ec4e89532I have bought from tedchen1632, but not this particular item. I work most of the time with SMD.It is more important to have a good selection of values.I would add to this a larger quantities (100 pieces) of some values:470, 1K ,4K7, 10K, 100K, 1MSo of what you will need to depends on what you are planning to buildFor a beginner I would not focus on accuracy and tempco. The chances are if you need these properties, you probably aren't using the standard E12 values.Good Luck !!!Jay_Diddy_B

author: msgol
author_rank: Newbie
timestamp: January 07, 2013, 06:40:52 pm
content: hiI'm new here.just wanted to say i found this months ago and got it, so far been happy with themfree shipping is very slow tho, 2 weeks on single item, and usually 3-4 weeks if you bought more than 10 different itemshttp://dx.com/p/diy-1-4w-resistance-metal-film-resistors-2500-pcs-152924

author: Unknown
author_rank: Unknown
timestamp: January 07, 2013, 07:13:18 pm
content: Quote from: Jay_Diddy_B on January 07, 2013, 03:30:23 pmI agree that those properties are irrelevant for most beginner circuits. If the parts are carbon film, then I'd prefer them to be properly labeled as carbon film however, so you can distinguish them from the occasional real metal film resistor.I disagree with the assessment that precision resistors will likely not be E12. Plenty of circuits require resistors that have to be matched, but their actual value is not critical. Voltage dividers for example, or differential amplifiers. In those cases I try to stick to E12 values, even if they may be 0.1 % parts, since availability tends to be better. For example, I recently had to generate a very stable 0.3 mV signal into a very high impedance (so output impedance was not an issue). I made a ~10,000:1 voltage divider from some stable wire wound resistors I had laying around, and adjusted the voltage source to feed it the correct voltage so the output was 0.3 mV. Those resistors were E12 values. It's only the specialty 0.01% and better resistors that tend to be odd (and custom) values.

author: Rick
author_rank: Frequent Contributor
timestamp: January 10, 2013, 08:05:38 pm
content: I have bought mine from here:http://www.ebay.com/itm/290743742479?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649and measured the values of a 1 kohm resistor to calculate the standard deviation.With an average of 999,3 and a standard deviation of 3,19 ohm, all of them are within the limits of 1% tolerance 990-1010 ohm.I guess these are acceptable, right?1.002,7 11,56996,1 10,241.000,9 2,561.005,6 39,69999,1 0,041.005,2 34,81989,3 100,001.000,7 1,96999,6 0,09997,8 2,251.000,0 0,49999,5 0,04994,6 22,09994,7 21,16997,4 3,61998,5 0,64995,6 13,691.001,0 2,891.001,5 4,84997,5 3,24998,6 0,49998,0 1,691.002,0 7,29999,6 0,09997,6 2,891.003,0 13,69998,6 0,49997,2 4,41998,1 1,44998,7 0,361.000,9 2,56996,9 5,76990,8 72,25999,8 0,251.003,3 16,00999,6 0,09997,7 2,56998,7 0,36999,0 0,09997,9 1,96999,0 0,091.001,3 4,00997,9 1,961.002,8 12,25996,7 6,761.005,3 36,001.000,5 1,441.002,4 9,611.002,5 10,241.003,4 16,81999,3 3,19

author: Unknown
author_rank: Unknown
timestamp: January 10, 2013, 10:03:32 pm
content: I don't see a reason to assume these resistors are not 1% tolerance. All values are inside the limits and the statistics also seem reasonable.