What is your favorite resistance value? 1K? 10K? They are all good, but when you hardly need resistors, nothing is better than the old zero-ohm resistors.
Wait! The resistance should resist the current. What is the use of zero ohm resistors? Well, the short story (Tee-hee!) is that it is like a jumper for a single-sided surface mount board. In the bad past, companies often saved costs by running a single panel, and you could buy jumpers to help simplify the layout.
Fast forward to the modern era, where there are no through-hole components. What is the resistance (ideally) of the wire? Zero ohms. So zero ohm resistance was born. In 1206, we placed a complete spool in the closet, which was the largest SMD size we used, with the goal of being able to sneak two to three tracks under it even on a homemade etching board. They are great.
Anyway, what makes us start to subvert the lowest value resistor is
. Of course, nothing has zero resistance. This article will take you step by step to understand some of their actual properties. Please enjoy!
Damn, my master plan is to weld thousands of animals into a ring for superconducting current storage.
In any case, the solder joints will help you.
*will have
The third stage, profit
I work in a place that often handles temperatures below 10 Kelvin. At this level, you must be aware of solder formation.
~However, there is a limit to the current that can flow through the material before the material loses its superconducting properties.
It doesn't matter, you can place a parallel between the joints... hell, just to make sure that each side is ok. ;-)
What an ugly board, eroding like hell :)
It is actually a pit and full of toner. It's ugly, but it's been four years since I entered the password, I've smuggled the password in my pocket and bag,... I licked it and kept ticking. No complaints.
But yes. On the surface, she is not the winner.
(Oh, you think the corroded part may be the "G" I wrote in Sharpie, which means the ground pin on the programming pad.)
Hey, Sherlock, my brain detective, is still spinning with things on Atmel and USB, maybe often in his pocket? Because the corrosion looks the same as the old phone, it took me about 5 years.
Wabi-sabi (Wabi-Sabi) electronic products.
What is it?
In the middle of the photo is the 680 series with 000. Is it easy to bridge traces with only 680?
"In 1206, we had a full spool in our closet. This was the largest SMD size we used. The goal was to sneak two or three tracks under it even on a homemade etching board."
Since 680 is not 1206, maybe you can use 680 and 000 at the same time instead of buying some large 680 to be faster?
good idea! I do not remember. Maybe I didn't have the technology/method to reliably pass the trace under the smaller (0805?) 68 ohm resistor?
Soon after I moved, pitting on the copper made the circuit board old and had to use a color laser printer for a terrible transfer. In retrospect, my heat was also very high at the time, so I often stained the marks during the transfer process. I bet I just don’t trust myself and don’t want to clean up.
Technically, they are called zero-ohm "jumper wires", not resistors. As you pointed out, resistors...resistance.
I want that shirt! ! ! ROTGL !!!!!!
No problem, it must be here
Maybe elsewhere (maybe there is also eevblog-shop?)
I don’t know what "ROTGL" means...
Maybe he is one of the country huts with heavy soil on the lower level, so he can only roll on the ground with a smile, not on the actual floor.
Laugh on the ground? Is this some kind of joke?
that's nice! That's really smart, I will definitely use zero ohm resistors as jumpers on the next board I make. thanks for your hints!
Again, here I am stupid because I didn't think about it early, which is much better than trying to queue 2 layers.
Therefore, my daily work is an engineer for an aerospace company; I am developing and testing weather satellites in civil aerospace. In the last month, I have been troubleshooting a flight card that will enter a module scheduled to fly in 2018. The module was designed in 1997. Due to the discontinuation of some components, the last design change was in 2009 for the main communication protocol chip.
Use the new chip for the first test. The board failed. Cannot establish communication with the test PC. Contact the chip manufacturer; this is listed as a "substitute." Suppliers view our schematics. "You have a 4.7K Ohm pull-down resistor on both pins. I have seen some leakage currents before and the deception logic is very high. Replace a 0 Ohm resistor and see if it works."
There is a technique to shorten the resistance pad on the engineering board. Gosh, it works.
The 0 Ohm resistor is the new resistor of choice.
Well, I can't say that I don't know anything, but the 4.7K pulldown will make me scratch my head first, and I will never think of using anything over 1K that I want to pull down.
???? 4.7k is the "standard" value of the pull-down resistor. Depending on the type of signal and logic device, I even used values as high as 100k.
4.7K is the pull-up *pull-up* value.
Please explain further... Why are the values of the pull-up or pull-down resistors different? I have always thought that 4.7K is the *standard value.
Except for CMOS, Vih is farther from Vcc than Vil.
This article describes a chip that has been re-run to replace the old chip. The old technology requires lower values (usually) and also has asymmetric input characteristics. An example is the original TTL technology, which has a higher bias current, so the pull-up *up* is about 4.7K, and the pull-up *down* is about 330 ohms.
Newer technologies such as microcontrollers have very high symmetrical input characteristics. For example, the internal pull-up resistor on ATmega328p-pu (the resistor used on the smaller Arduino) ranges from 20K to 50K. I can't find the input impedance right now, but as you can see from the memory, its order of magnitude is 100 of K.
If the through-hole resistor you are using is a very large inductor that has been adjusted inductance, the lower value will be used more to shunt any voltage that may be induced into the "inductor".
Okay, I found the input impedance. The reason I haven't found it before is that it is designated as 1uA leakage current of I/O pin with Vcc of 5.5V, which is about 5.5Meg ohm.
@grab:
"Except CMOS" :-) I regard CMOS as the standard of today's electronic products. Therefore, the logical threshold is usually in the middle.
Do you own shares in a power company? :-)
Or worse battery manufacturer?
4k7 has wasted 1mA (@5V), I mean, of course, it depends on the voltage level and the required speed, and sometimes it is necessary to reduce it to such a low level.
I always use 10K for pull up or down. I have no reason why anything else I use 1M b/c here will extend battery life except this battery-powered radio switch.
Ah, you can enjoy the freedom once!
I would be very careful when using a 0 ohm resistor on the non-power pins of the IC, because it may cause the ground impedance to be lower than the power pins and may affect the noise immunity. Due to the chip design, this is not a common problem, but once it happens, it will take a long time for you to find it. 5-10 ohms would be a better choice.
My favorite resistor is 1.1k 1 / 4watt.
Around 1976, I still had a leather bag in a bag for only a few dollars. Import from a well-known American company, not cheap import.
Very suitable for use at any time when 1K resistance is needed. And their leads are very long, different from the resistors I unplugged from the circuit board.
I have some more today.
Michael
A few years ago, I got a killer deal of 200 1.2k resistors.
I have some 0 ohm resistors in the standard 1/4 watt style package in the resistor box and they are stuck with the flooded old stereo amplifier. It has only one black stripe and I want to know how I will deal with them.
Yes, I have some myself. There is nothing better than this sexy stripe. It has never been used before, and may one day be used for some art projects.
I use them as arms on cyborg earrings :)
I use them for exactly the same operations as in this article, jumping along straight lines on a single-sided household etched PCB. It's really just an aesthetic. I prefer the appearance of a "resistor" rather than a little wire, but it is also easier to plug in. If you want to do "top welding" and trim your legs flush, the main body will use them The blocking bottom is a flat surface.
I have seen many 0 ohm, 0%, 1/4 watt lead resistances, at least the color code seems to indicate: black-black-black-black
The company I work for uses them as voltage selectors in power supplies. All three are 120, these two are 240, and so on. The default value is 120 (for partially assembled instruments) for initial testing (then aging and final testing are modified).
I saw the types of through holes in the first one on TV. When setting for different countries/regions with different transmission standards, a 0 ohm resistor is used to select the properties of the area, so *only* needs to change the bill of materials, not the entire schematic and circuit board.
I have always been confused about how to calculate the power rating required for zero ohms. ;-)
Even more confusing is the percentage tolerance of zero ohms. Can I develop negative resistance?
Very simple, (actual-nominal) / nominal.
I think your formula is no longer valid; regardless of the measurement, I will keep getting 255.
With this equation, I have a very small number on zero... theoretically I should have a ∞W resistor...
They are already rated current. The current of 1206 is about 2-3A.
Depends on resistance:-)
Once provided, some types can only guarantee <50mOhm. Calculations show that in the 2512 package, they have poor performance over 2A at higher temperatures. But they exist in the form of solid copper, suitable for 100A
Be careful when buying them: be sure to use the 1% version and don't be fooled by the poorer 5% version!
I got 50% cheaper dirt from Elbonia and I still think 0 * 1.50 = 0 :-D
It seems that the resistor in the picture is a "bridge" of a trace.
Is it safe to use this way? Is there no real opportunity to short-circuit below?
They are made in the same way as ordinary smt resistors, and the bottom is not conductive.
That's all of them. Otherwise, if the traces are adjacent to each other, why use a 0 ohm resistor instead of just connecting the traces? ; P
Sometimes you need to use resistors for some hardware configuration, I also saw optional antenna filters (in the GSM world) where the inductor is shorted to the 0ohm resistor.
Like a bridge over the traces of trouble?
No, they are ceramic underneath, at least the normal thick film type
They are also used as configuration jumpers and isolate the parts of each test (installed after the test).
I was looking at the development board a few days ago, and it has all these uninstalled 2-pin x connectors. The schematic shows them as configuration jumpers. Turn the board over, and then there is a small (0405?) 0 ohm resistance bridge through hole instead of a jumper.
However, this is great for segmented testing. I will have to remember this.
Yes, I have a project where the EE guy cleverly disguised this thing: there is a PI filter on the power line of each subsystem. Therefore, when you debug, you can isolate the subsystem by removing the inductor, but in production, if you see that the PI filter is not necessary, you don't actually need to fill the PI filter, you can use a 0 ohm jumper. No rotation.
Yes, that’s what I’m talking about here: when power is on, we place them everywhere to isolate the circuit group, and most of our ATE boards have a large number of unfilled 1206 points, and we fill them on each board These points so that ATE can recognize which board is used. It is much easier than serial eeprom.
Not long ago, I ordered a batch of 1,206 0 ohm resistors from Digikey, and they sent me a batch of 500mA fuses. I'm a bit entangled in how to answer, because, well, they work very well, so they are not the wrong part, but not the right part.
There are two more on my current board: it has three power inputs, one for logic and two power amplifiers for logic control, so even if the amplifier is short-circuited, you can guarantee that the logic will remain valid. On the evaluation board, for ease of use, we loaded 0 ohm resistors between all three power supplies so that it can work with only one power supply. Similarly, its purpose is to use uC on the same board and have short traces to the chip. If uC is in other places where the trace/off-board position is longer, we will provide a package for the rc filter, but bridge it with zero for use.
Oh, on the ATE board for high-precision current measurement, I often put down four footprints, two in series and two in parallel, so that I can load resistors to accurately obtain the required detection value. If I am lucky and find a suitable resistor, I will put a zero in series with it (and hope it is actually zero, but this is the purpose of four-wire resistance measurement.)
This is why I like Hackaday.
I remember that it was the first time I saw them in an Otari MX-5050 eight-track reel-to-reel tape drive. The 1/4 watt resistor beige package as described above, with a black stripe. what is that? Actual measurement, zero ohm. We just started laughing.
Yes, it must be admitted that when I first encountered them in the 90s, I thought it was some engineering Easter egg joke.
As far as I know, these resistors exist because the assembly machine (for THT) cannot handle bare wires.
I just want to know if an infinite ohm resistor is available somewhere?
Of course, but they are divided into two parts;)
In fact, the linked article talks about a company that uses 0 Ohm resistors in useless places, and the resistors are not marked in various colors to prevent reverse engineering.
Therefore, perhaps some companies also use counterfeit infinite resistors for this purpose, placing traces and placing parts with only solder pads and no internal connections.
Once they were rolled up in a "spare" box, this was called a "package short".
I use them as ties. Because network connections are evil.
They can also be used for (low precision) current sensing resistors and as fuses.
Just because they have a rated current does not mean that they will act as fuses. If you need a fuse (for example for UL/safety/legal compliance reasons), you need to use a fuse.
Removable Pololu A4988 stepper driver modules use them as current-limit detection resistors, and it is not uncommon for the ICs on these modules to emit deadly smoke.
Shockingly, I have seen them used as fuses in E-POS devices. Even ferrite beads are deliberately too small to act as fuses and emi filters.
Although no one has ever exchanged in this field, we do have a unit to return, and the sub-board is actually charcoal!
The daughter board provides power to the operator's face-to-face display, touch screen and display data.
However, the cause came later: a cable (similar to a small SCSI) was severely worn, cut and burned.
Lesson: Not a fuse! ! ! ! ! !
These resistors are also useful when creating new circuits that you are not sure about.
For example: Create an RS232 line and worry about ringing? When something goes wrong, put in 0 Ohm and swap it with the "real" resistance.
^this x10 ^
New designs, early prototypes are still playing a "hypothetical" role. Just sprinkle them on the board, and there is even half the chance that they might be useful later.
Then, one of my favorite tricks is to use them in a "pair" on the TX and RX lines of the serial connection. With a little thoughtfulness, you can use two of them side by side to reverse the RX and TX connections (horizontal and vertical).
I just did RX TX on the prototype board. Had to make a record for the next guy on the silk screen.
You are wrong, you are all wrong. It is the ultimate current sense resistor. When my Kickstarter launches erer, please read all related content.
On my project audio preamplifier, I have an output op amp that can operate in unity gain mode. If you want to get a profit, enter 1k or 10k, etc. (and the matching front end R is the same); however, if you want to get uniform gain and there are smd pads on the board, you can use 0 ohmR. In fact, I bought the first bunch a few weeks ago. The previous board speed allowed gain, but I want to configure this version to get unity gain. The ugly way: disconnect the leads of the TH parts as a bridge between the pads. But 000 is cuter than the black line on the board;)
Can a zero ohm resistor not be used as a simple type of thermal sensor? Increase heat and increase resistance.
This is zero meaning.
You...good job :)
Zero has been around for a while. They were found on boards for HP2100A small computers in the size of 1/4 watt through holes in the early 1970s, even before SMT was envisaged. That is double panel...
Thank you for pointing this out. I read this and said, "Huh? Is zero ohm resistance a surprise?" We have HP, and these are the springboards.
Yes, starting from the old joke about zero ohms before surface mount, if you want to divide by zero, you can solder with an analog quantity, then solder the zero ohm and divide by zero, unfortunately, it always leads to components Damage or short circuit
Well, if you get a 1v power supply and a zero ohm resistor, then mathematically speaking, you will get unlimited amps.
If you then use infinite amperes and use it to pulse the transformer, then you should get the infinite ampere voltage minus the losses (still infinite).
Unlimited voltage and unlimited amps provide unlimited power.
SSH, keep secrets. Don't we want those guys with too many units to figure out one person now?
The above logic is based on the text joke of a person sitting on a chair and jumping out of prison.
I just like to read short stories.
So far, I don’t know how useful a 0 ohm resistor is in my life!
-Single board bridge
-"Not sure which resistor or capacitor to place" placeholder
-Easy to test probe
-Switch the purpose of the board once
Machine can place wires
-Landmines that are reverse engineered when disguised as other components
-Reference for testing other resistors
-Cheap test oven settings
Joking with other engineers
-Projectiles of the Mini Railgun
And embedded in the black powder rocket engine for electric launch.
Make sure you get a high-quality 1% metal film 0 ohm resistor with a low temperature coefficient!
They can also be used as jumpers for things that the user does not have to change. You can change the jumper settings by flipping a bit on the pick and place machine, which is cheaper than through-hole jumpers (needs to be inserted manually) and does not need to throw away the PCB inventory for small changes.
Resistors with values less than 0 ohms will be very useful.
There is not enough market to produce it as a standalone device. You must do it yourself.
(Hint: operational amplifier)
Quote: "Of course, nothing has zero resistance"
What about the negative resistance used for the chaotic oscillator 99 in Chua’s circuit?
These are also used as the main components of the black noise generator.
I have a very old radio (70s, maybe early 80s). It has a circuit board, but everything is soldered on the circuit board by hand or through the circuit board.
It's dead, so I opened it just to look around. It has a zero ohm resistance at the location where a wire is cut short. Resistors have additional contact points, which can be soldered together. The bulk of it is actually mounted on the board.
I need infinite ohm resistor
Place contact A in the center of the known universe...Place contact B on the PCB. Start to leave contact A... Stop when your resistance approaches the required infinity.
^Ahahahaha
The 6 amp fuse or solder bridge does not work?
Some ham transceivers use tiny resistors (zero or non-zero ohms) to configure the gears. Tailor the correct frequency band, and your ham-only radio can be transmitted elsewhere in the HF spectrum, including marine radio frequencies. In a pinch, your ham radio can double that of an expensive marine radio.
I started doing this when I started working on the toner transfer surface mount board-no need to drill jumpers!
Regarding through-hole 0R resistors, there are usually two types: one is that the main body is a ceramic block with carbon or metal film flashing, just like ordinary resistors; the other is that the main body is metal (usually copper) or contains Iron thing, I don’t know whether it is steel or iron, etc. These are very useful for lead legs on small modules, especially if you can purchase various metal bodies-leads become current limiting.
Sometimes called "machine pluggable jumper."
I work for a small and medium-volume EMS (Electronic Manufacturing Service) provider (also known as a contract manufacturer) and perform a quick system check. At present, we have provided 18 active part numbers for various 0 ohm resistors, the total number is close to 160,000. All components except 3 are SMT, and the package size ranges from 0402 to 1206.
Sometimes I use a 0.5 ohm resistor as a jumper from the SPI line to the EEPROM. It is very helpful when laying single-sided boards...looks much better than jumpers...
But don’t forget that if the application does require a fuse, you should use an appropriate rated fuse...
In our voltage distribution unit, even a mobile wrench is a fuse. Its grade is about 3 Gelignite, and has the additional function of dismemberment.
In the past life, I worked for a computer manufacturer. The company that designs our motherboards will place zero-ohm resistors in all the data lines of the serial, parallel, front panel audio and PS2 ports, while there are still these resistors on these motherboards. We will send the circuit board for FCC test, and then fail, and then start to replace the zero ohm resistor with ferrite until the test passes. Why not place the ferrite in the first place? Their cost far exceeds zero ohm resistors...
I think that if necessary, a series termination resistor (a few 10 ohms) can be used instead of zero ohm resistance.
It might be so. Since I have been working there for many years, I really don't remember the details.
I built a lot of things on a single-sided Perma-Proto board and found that 0Ω through-hole "resistors" are very useful for jumper wires (easier than bending the wires to the correct length) for power wires or over the center. Divide. They are super cheap in China and much cheaper than pre-made jumpers.
I remember someone told me that a zero-ohm resistor small enough was inserted into the via.
The story is: the traces in the vias act as inductors at RF/microwave frequencies, and resistors help eliminate this.
I have never ended such a high RF job, but I remember this story.
The confusing story is, but the size of the hole in the microwave oven window will let you know how big the hole can short-circuit (or reflect) microwave energy. You will not get microwave energy through holes of the same size or smaller, so you will forget to send microwave signals through through holes.
You will see that in all high frequency PCB antennas, they are only on one side. I via is a reflective pile that will reflect most or all of the microwave energy.
Can we just use wires as jumpers?
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