Hello, "Thank You", thank you very much for your demo/presentation. It was really good... My own experience, has been "great", with buying resistor kits. I have NEVER had a bad kit from the seller I buy from.

I also buy the inexpensive megapaks of resistors. If I'm doing something precision I just measure bunch and pick out the closest to the value needed and not worry about the long term

What I liked about my old tan colored carbon resistors was that the leads were fairly thick and I could read the color codes easily.

@crazycrab8578

2 жыл бұрын

I am new to this, have done a few things in the past, but blue, who came out with making them blue, the EU

@andyapple9

2 жыл бұрын

I have rhe same issue with the blue color. Hate it.

Most modern electronics will be using these anyway rather than the branded stuff. I don't really see where they can go wrong making resistors.

@ManuLeisure

2 жыл бұрын

Copper has batter resistance, fast response and and it is less corrosive than non magnetic ones!

Hi John. I use these relatively cheap resistors all the time. As you said most circuits are quite happy with a 5% tolerance, so a near 1% is just fine and of course much lower noise than a carbon resister.

@uK8cvPAq

7 жыл бұрын

What makes a resistor noisy?

@JohnAudioTech

7 жыл бұрын

I'm no physicist but it is referred to as thermal noise. For whatever reason, carbon resistors have higher noise than the metal film types. Believe it or not, the transfer function of carbon resistors is slightly non linear and can cause some distortion. All the amplifier design books I have looked through say to avoid the use of carbon resistors in critical parts of the amplifier.

@MarkTillotson

6 жыл бұрын

All resistors have thermal noise, "Johnson noise", its part and parcel of being resistive. Carbon types, especially carbon comp have "excess noise" (other kinds of noise), due to the nature of the material used, and usually this has a 1/f spectrum (ie very bad at low frequencies, typically called "flicker noise", due to the random voltage perterbations you see on a sensitive piece of measuring equipment). These days you'd not use carbon resistors in a microphone amplifier (its possible to hear the improvement when metal oxide or metal film are substituted for sensitive applications like this). I think there are modern carbon types with much better noise performance, due to more precise manufacturing processes, but they are film, not composition types I am sure.

@rich1051414

5 жыл бұрын

Carbon resistors can sound like rice crispies when you pour on milk.

@robertneill3057

2 жыл бұрын

Probably use in microphone and nowadays to a lesser extent, RIAA amplifiers. Also use in any D/A stages (cd/DVD players and Bluetooth /Toslink converters).

I purchased a big kit of 1/4 watt 1% resistors from an Amazon seller and I checked many of them and several were bang on to the listed value and that surprised me. My DMM is a really good one, but it may be a little off. That being said the 500 ohm was exactly 500 ohm, so some of these cheap kits are really good.

Nothing wrong with cheap & cheerful resistors - although not meeting their marked tolerance is a bit of a worry. Generally you'll know when it's a critical application & pay the extra for what you need. For example, the 6.8k phantom power feed resistors in a mic preamp need to be super well matched or you'll ruin your common mode rejection ratio - in that case I'll pay a couple of dollars a pop for 0.1% resistors, then test & select a pair that are within a few ohms of each other. You need to be careful of temperature effects when you're aiming for that sort of precision, though - even holding them in your fingers will cause a noticeable drift in value.

Ahhhh more eBay videos! love it!!! I bought a 100 value, 10 of each 1/2W 5% resistor kit for $13 from china last summer. so far everyone i've tried, 220, 470, 1K 5.4K and some odd value have all been within tolerance. only gripes are the leads are about half as thin on what you have in this video. but the worst is the cut tape on them was TERRIBLE!!!! they are always falling off and they won't stick back on. i have a pile of 60 or so resistors that have fallen off the tape.

@robertfleming5193

5 жыл бұрын

that's good if the tape left a gummy residue they would suck so falling off is good

I like the formula at the end. I bought a box of quarter watt resistors same type from Amazon Resistorland brand and used them for transmitters and the wattage worried me but so far they still are working...not to sure how to measure the transmitter wattage yet

The first time I purchased one of these assortments I discovered the leads were too thin to sit snug in all my breadboards. Some breadboards were snug in all holes while other breadboards would be quite random from hole to hole.

Hi thanks for the very informative video. Do you think that noise can be an issue with resistors ? i am obsessed by just one resistor ... the feedback one I wonder if different noise figures from brand to brand can have an impact on the sound. It is a very small part but with an importan task ... so its noise performance and linearity with frequency can be critical. Thanks again. Kind regards, gino

I so need one of those..... should come in handy

I have a receiver with DVD player that has a bad resistor. I know the ohms by reading the bands but how do i get the others numbers so I can buy the correct resistor watts? Pls help me.

Thanks for sharing, I'd properly use the cheap components for testing, developing and all that. When I then have a project I want to keep, then I'll bye good quality components.

Would you mind putting in a link to the kit? Other kits I have ordered is wit very thin leads. yours don't look like to have that. Kind Regards. Ps love your channel. Have made me go in to the hobby again.

I did some test on the resistors to find the values drift with temperature, not 1%, use inferior thin steel leads, and do not solder as well either. In most circuit they will still work, but I question the long term reliability, and figure its not worth the hassle of having a massive problem afterwards, the cost savings are not worth the risk for such a low value item.

looks like the E24 series but missing a few values

I bought a pack of these (1280) and the 180 Ohms were marked 180 but really 120 Ohm

What about capacitors for audio? is there any difference in quality between the good brands and the cheap ones?

@shitheadjohnson2797

2 жыл бұрын

if your only after 400 or so picofarads and under you can just make them yourself out of copper tape, and wire for 10 picofards and under.

Digikey is a distributer and not a manufacture. Also, EEVBlog did a video showing how several resistors he baught through digikey, were out of specs brand new. Also, I love how you have the exact same meter as me (The Radio Shack One)

I bought 3500 1% 1/4W Resistors from banggood For $3.56 -- I made a Resistor Decade Box with push button switch. The plastic case was the expensive part of this project! Total cost including 2 Red/Black Banana Jack's $12

The 'classic' abbreviation for voltage is U, from the Latin word: 'urgere', which means 'to press', or 'to push'. This makes sense: the voltage 'pushes' the current through the resister. BTW, the abbrevriation for curren "I", is derived from 'Intensity'.

@martinda7446

5 жыл бұрын

That was rather nice to read, I was wondering about the 'U' recently - One of our European contributors uses the 'U'. In the UK we generally always use 'V' and none of my literature from over 50 years uses U..Some things just pass you by...You sometimes just accept things without question. I never questioned the 'I' for current either..Grrrr I'm annoyed with myself.

@robertfleming5193

5 жыл бұрын

the classic abbreviation for voltage is E the classic abbreviation for current is I the classic abbreviation for resistance is R go check it out 73's

@robertfleming5193

5 жыл бұрын

NO the classic abbreviation for voltage is E not U

@Koen75NL

4 жыл бұрын

Not sure where the E comes from. U is used instead of V because V might be confused with the unit symbol.

@RexxSchneider

2 жыл бұрын

@@robertfleming5193 No the abbreviation for electric field is E. Voltage is quite consistently V these days.

Use the cheap ones for tester circuits, use good ones from vishay or whatever for the final product. 👌🏻

Hi John. I have used some of those "China" resistors and they seem to do the job with no problems. Hope all is well mister.

Have you measured the resistors in 4 point probe wire kelvin measurement on a 4 point probe DMM (calibrate DMM). A more accurate measurement.

@matthewkleinmann

6 жыл бұрын

A 4 wire ohm meter will only make a difference when reading very low values of resistance.

Hope so I have a lot of those too

I have noticed the legs on these resistors are very thin, probably no big deal but the quality difference compared to a mouser or RS resistor is noticeable. Saying this the cost is more

Most really cheap parts are untested. We use to get 15% failures on opticouplers on flame sensors the would fail in circuit test. About 30% of some chips on a low frequency radio board went up in smoke in during functional testing. A whole pallet with reels of resistors had about 10% bad. The department that bought the parts didn't want to spend the money on tested parts even the parts that hurt parts per million in defects, they got bonuses for saving money while we were pressured to do something about the defects. The untested opticouplers costed about 10 cents but the vendor charged another 5 cents to test them. Sometimes I would remove the component and solder in another bad component. Soldering the ASIC package chips with 40 J-leads was a pain, it was faster to put them on a BGA machine to remove them. Building military stuff doesn't have that problem because every part is tested from the vendor before it's soldered on the board.

what about those cheap capacitor kits?

@diggydude5229

6 жыл бұрын

I've bought large grab bags of both ceramics and electrolytics. No problems with any, except it's hard for me to read the tiny print on the ceramics. LOL

if i have 2 1/4 watt and need 1/2 watt. can i combine the two 1/4 to make 1/2?

@ayylasco

4 жыл бұрын

Nope. It'll divide the resistor value by half. So if you have 2pcs 10ohm resistor wired in parallel, you'll get 5Ohm.

I hate it when those assortments don't use E6/E12/E24 or something like this.

The cheap resistors are fine, especially if they are metal foil. They aren't noisy or anything so all you gotta do is check the resistance.

Would like to of seen if they can handle their rated power for several hours..

@martinda7446

5 жыл бұрын

They will handle the power but values are prone to vary with temperature. I had some that went in the bin, see comment above.

@Koen75NL

4 жыл бұрын

More interesting would be their temperature stability. How they compare with the brand ones.

I dont complain about the tolerance. They are €0.005 or less a piece wich is 40x less than i pay at my local store

These are fine for breadboarding, which is what these sets are for.

Don't know why they wouldn't be. Blue resistors are usually 1% tolerance. 1% tolerance is 1% tolerance and all of my components work fine. They're metal, film resistors and they're very simple components. So there's not really anything to go wrong here.

Should check wattage too

i can't read the the ones sometimes

Resistance is one value what about their power rating?

@JohnAudioTech

5 жыл бұрын

The ones I bought are 1/4 watt.

I definitely didn't only buy the metal film resistors, because blue is nicer than beige...that would be ridiculous :)

"Resistance is futile"

@sierrapadilla808

4 жыл бұрын

Nice video content! Apologies for chiming in, I would love your initial thoughts. Have you ever tried - Qanayce Wiyulian Equalizer (probably on Google)? It is a good one of a kind guide for unveiling the technique to repair your electronic items minus the normal expense. Ive heard some unbelievable things about it and my mate after a lifetime of fighting got astronomical success with it.

link

I just ordered a small resistor kit from digikey, they stiffed me with the higher shipping rate! kit=$17.00 shipping=$12.00, they could have sent it usps 1st class at $3.00, but they chose to put it a large box to make it heavier, thus jacking up the shipping cost, so point being is that if you are going to order, make it a large order or it is not worth it

@JohnAudioTech

7 жыл бұрын

Did you select USPS 1st class option at checkout? I always do and that is what I am charged. I just got a package delivered from them today. It was a bit larger than normal for the components, but I think it is still in the 1st class size limit. I weighed it at 12 oz. I will have to double check to be sure I didn't get hosed on my $21 order.

@bigbread9000000

7 жыл бұрын

I did ask for that option, but they uped it to priority mail without asking, the customer service rep said it came in at a higher weight. I am a usps employee and I know that the only way those resistors could have been at a higher weight is if they used a larger than normal box

@JohnAudioTech

7 жыл бұрын

The label on my box was first class and the box was 9x9x4 in size (larger than they usually send my stuff in). It just barely made 1st class by weight. Hopefully this isn't a new change at DK as it will be harder to make the first class weight limit with some of my orders. I buy from them several times a year and haven't had an issue. Perhaps they just goofed up in your case.

My experience is the leads on these resistors are _super thin!_ They're barely usable in breadboards. I've been looking for alternatives with thicker leads online, but to no avail. Beyond that, the accuracy has been good for my applications as well. I tinkering a lot with resonant circuits, and generally notice drifting or if something is not in spec fairly quickly. And as long as you solder them, you'll be good.

@JohnAudioTech

5 жыл бұрын

Yes the leads are thin and are steel core. You have to go to a place like DigiKey for better quality.

@toddzino58

4 жыл бұрын

Mouser has the Xicon brand 1/4 watt metal film for about $2.00 per 100. Excellent quality with thick leads. I just grab some in the main values I need. YMMV.

I'm a gen X'er....I like Dale/Vishay's cause the value is written on there. No color bands for lazy young'uns like me.

I've found cheap resistors like this are generally unstable under any kind of thermal stress and the leads are so thin and weak that you can't even push them into a breadboard without them folding over onto themselves. Just my experience.

Yes they are...bought all kinda metal film assortments before....cheap and worth it....nothing really specific or a point for carbon film anymore imo....Oxides or Cements/wirewound is a different story though...they usually have had a little better handling. Take a chance and have seen a lot of carbon film/comp open or drifted and I have.

test the leads if they are magnetic or copper with a magnet !

@MisterBigwolf

2 жыл бұрын

I think they are magnetic for this price. Years ago I bought on aliexpress perfect 1/4W resistor kit with non-magnetic leads, for good price $25 or something and lead resistance about 1.8-2.0mR. Now i can't find the same, prices are cheap, steel thin magnetic lead with 20mR resistance. Steel leads are half of a problem, but they are damn thin and bends. I can buy Taiwan resistors separatelly in my local store with good thick copper leads.

The only way to know is performance Over time…..and to test wattage rated value over time. And remember you get what you pay for

We ser you many top dorrah lesistohs. High torerances, row plice. Cash onry.

One thing that immediately comes to mind is to test how noisy they are somehow

The vast majority of average meters are not sufficiently accurate to measure better than 1%. I have done similar tests a few years ago using a meter calibrated against a laboratory standard set of resistors (better than 0.1%). Nearly all were within spec. The vast majority of circuits don't need better than 5%. On the other hand I recently tested some Chinese ceramic capacitors, and in most cases they were way off, anything up to 30%, generally on the low side.

one good test i always thought was to 'burn' a resistor while hooked up to the meter with either a low temp flame (lighter or match) or a propane torch and see what happens to the value - the chinese 1% ones i bought didnt' change value at ALL

@martinda7446

5 жыл бұрын

That is very interesting - mine were wildly changing - They dropped to over 35 % value. Binned the lot. I will certainly try some more. Where did you get yours?

Try ali exspress are even a lot more cheaper then ebay or bang good .metal film handles heat better then carbon resistors

Hell I have just pulled out a 60 year old resistor that reads 80k instead of 39k so how a Chinese replacement be worse I don't know.

@jasejj

2 жыл бұрын

I just repaired the SMPS in a two year old bookshelf stereo system where a 1M resistor failed running at 50v. Quite how that happened is a mystery. It was a cheapo carbon resistor and I replaced it with a cheapo one of these. The main problem with cheap components I think is higher failure rate, and if a device has 200 such bits in it, well we see the results all round us. That said folk tend to toss stuff because it doesn't fit with their decor these days rather than because it is end of life so the need for quality is questionable. Very few 2018 stereos will still be around in 60 years even if they still work!

I thought I'd try some of those cheap resistor kits, a thousand or whatever with values from 1 ohm to 2 meg or so. They measure OK at room temp, but the leads are like awful skinny bendy things and what made me put them in the bin was the stability - under load these are going to be crap. Heat one up and watch the values swing wildly. Tested next to a regular RS 0.25W 1k resistor a fairly harsh test was done raising the temp to over 150 degrees. The cheap resistor went down below 800 ohms, the RS component (which was 40 years old) - no change detected. I heated even further - roasting them a bit, RS no real change (maybe an ohm or two), cheap one kept dropping, though to be fair it recovered at room temp to near rated value. Negative 35% was about the order. I thought maybe I could use them for something...but no, they are useless for my needs and in the bin they went. What are they? Crappy thermistors or crappy resistors?

@martinda7446

5 жыл бұрын

NB Wonder if I was sent carbon film Rs instead of metal film? Temp coefficient is one area metal film really scores.

@JohnAudioTech

5 жыл бұрын

I was wondering too as I read that. I'll have to test mine. Typical low cost junk.

@martinda7446

5 жыл бұрын

@@JohnAudioTech I was looking at the properties of metal film and it seems that the figures are in the few parts per million per degree, whilst carbon film is between 200 and 1500 parts per million per degree - right in the area I found. I guess they were not metal film.

Why are they blue?

@alphadevilfx

7 жыл бұрын

Because the resistors are made of metal film

@MarkTillotson

6 жыл бұрын

Also its to make the coloured bands hard to read except in very good light - red and orange are much easier to mix up on a blue background alas...

One parameter you said nothing about: is the working and over voltage rating. Note P=I(IR), IR=V is not the same as the voltage rating. These ebay/amazon sellers do not even mention the voltage ratings, (at least not the ones I looked at). So if you are doing mostly low voltage circuit - then maybe you are fine with these resistors, but if you are using them in tube amps - which may have hundreds of volts drop - then you need to be careful. The resistor may not sustain a high voltage drop even if the power rating is not exceeded. I buy from justradios.com/ which is more expensive but ratings are reported, and suitable for vacuum tube circuits. If anyone knows of other sources with proper ratings, please post the source information. Note: justradios.com/ also sells capacitors.

@MarkTillotson

6 жыл бұрын

You can infer voltage rating from the size of the resistor (air breakdown), 1/4W would typically be 200V or so, ie not upto most valve circuitry, fine for almost everything else. Its a conservative rating in practice, usually heat dissipation is the limiting factor unless very high resistance values.

I bought some like these on eBay, they're not bad! They are advertised on some sites as 1%. Not true! Read deeper it's 10%. And 1 watt. is it really 1 watt? I will have to let the magic smoke out and see! :-)

1% or 5% most of the time doesn't effect my circuit. But I also avoid Chinese stuff. Because it coats tin or silver with very very thin coat ,once you touch it , comeback a month later and try to soldier, it will have rust on it. You must waste more time to sand it off other wise you must put more flux which is acid and shorten you platinum life on your soldier tip. For IC they trend to use recycle copper(high impurity) and when you bend it twice the IC leg breaks.

@jameshauser1507

6 жыл бұрын

You don't use Chinese stuff---Hell you should probably get out of electronics. Chinese is everywhere.

"...you get what you pay for in this world!"

@bjtaudio

4 жыл бұрын

Not always you may get ripped off, so you get even less than you paid for.

sir i think my question puerile

Fine for building things like guitar effects and repairing electronics around the house.. But wouldnt trust these as far as i could throw them in any thing precision

1% is 1% and that is what they should be, no matter if only one is off its not acceptable period.

@MarkTillotson

6 жыл бұрын

Tempco is a very important spec once you get to high precision resistors, since a 1% resistor with 0.1%/degree tempco is basically a 5% resistor in some contexts...

I hate these resistor kits, I prefer to work more with a single value, but I guess if your good at mental arithmetic they still add up to resistances, doing it at total random. yeh so i guess it still works! but god how do you tell them apart...

These resistors are precice values ...........that does not make them GOOD resistors but reliable on used values !

Why wouldn't they be good?

2:44 There is no such thing as 'a per cent'; 'per cent' means 'per hundred that is 'in a hundred' so if you mean a half in a hundred then it must be a half percent, not half a percent',

300th liker

"pleaso give 5 star, and don`t post negative comment before speaking with us, if you leave negative comments you are on blacklist" That`s the kind of thing you see below these seller`s products lol..

Lana haa too kasha la ga

It never fails to amuse me watching (especially) the US "evaluations" of chinesium stuff. It doesn't matter if it's a $200 metalworker's vice or 20000 items bought for $1. Usually the review is flimed on a high value "quality" camera (usually made in ... yep! china). Sometimes, like this one despite a grudging start it turns out to be a reasonably balanced and fair effort (you really need a wheatstone bridge to compare consistency). Or it's a completely biased mash up that compares a $20 chinese doo dah with a $10,000 (god bless america) component, that, these days will usually have been made in china and then badged in detroit. Fact is the majority of the world's "stuff" be it motherboard or steel girder is made in china and shipped anywhere in the world for 20% the cost of a homebrew item. It's also a fact that the chinese will produce a whole range of knock off copies to a range of prices - it's not inferior manufacturing - pay 1/10th the price you'll get something half as good - pay the same money as the home kit and you'll get an item that's probably better quality than the original. It's not just the US ... it's the same in europe - we're just more used to using trade goods.

@mfr58

5 жыл бұрын

AW. I generally agree. A major aspect with Chinese stuff, is finessing of product design/performance and quality control. Some potentially great, very cheap electronics are completely ruined by lack of these aspects. Reason being, they are the expensive parts of production. You can't have everything on the cheap. Can be very frustrating though, when the ship is spoiled for an hapeth of tar.

No good.