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Post by frets on Dec 14, 2019 14:32:56 GMT -5
Hey Forum Members, Can anyone tell me what the component is in the black circle of the following photo? I’ve never seen anything like it. At first I thought it might be a Mil. Spec. Resistor. But with only one black band? If anyone knows, I would appreciate an identification. Thank you...  |
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Post by sumgai on Dec 14, 2019 15:19:20 GMT -5
frets,
Put an Ohmmeter across it.... if it reads as a short in one direction but not the other, then you've got a diode on your hands. If it reads Zero Ohms in both directions, then unsolder one end and double check it - diodes are not perfect, they can go South for no apparent reason.
If, however, you see the same reading in both directions (well above Zero), then it's probably a resistor. Unsolder one end to get a proper reading of its value. If there is now no reading ("OL" or "OR" on the meter) in either direction, then it's open and needs some tender lovin' R'n'R.  (R'n'R means 'Remove and Replace'.)
HTH
sumgai
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Post by frets on Dec 14, 2019 16:18:37 GMT -5
Sumgai,
Thanks for taking the time to explain identifying a resistor or a diode. I’m sorry to say that photo is off of the internet. I was looking around for a particular tone control and this one popped up. I guess we’ll never know what it is.
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Post by frets on Dec 14, 2019 18:30:22 GMT -5
Found what it is - a zero ohm link
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Post by Deleted on Dec 15, 2019 18:12:16 GMT -5
Diodes tend to have a ring one end or the other. Not in the middle.
I never understood the reason for such a low resistance value myself
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Post by sumgai on Dec 15, 2019 23:01:15 GMT -5
Found what it is - a zero ohm link And where, prey tell, did this little tidbit come from?  Inquiring minds wish to know....
And ange is pretty much correct, the black band is usually more easily discerned as being at one end or the other, but sometimes things go bump in the night, and we end up with a part that has the bands painted on in strange places. 
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Post by frets on Dec 16, 2019 23:01:22 GMT -5
Sumgai, I just started doing advanced searching on the internet and after about an hour ( I know, but I had to find it), I found it. And it makes sense on the push-pull it was on for sale. It’s just for connecting the switch to the pot and Andrew R. just didn’t want to put a plain ‘ol wire on it. Looks more sophisticated if one has a “thingamajig” that really does nothing other than impress. Zero Ohm Link - sounds like an album made by Depeche Mode.
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Post by frets on Dec 16, 2019 23:07:53 GMT -5
Description: A zero-ohm link or zero-ohm resistor is a wire link used to connect traces on a printed circuit board that is packaged in the same physical package format as a resistor. Wikipedia   |
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Post by reTrEaD on Dec 17, 2019 0:41:52 GMT -5
frets , be sure to read the packaging before installing this device. Zero-ohm LinkWarning:
Although this device is safe to use, under no circumstances should you attempt to calculate the current in the device by measuring the voltage across it and dividing by the rated resistance.
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Post by sumgai on Dec 17, 2019 1:40:10 GMT -5
Description: A zero-ohm link or zero-ohm resistor is a wire link used to connect traces on a printed circuit board that is packaged in the same physical package format as a resistor. Someone made this for profits only, you can take that to the bank. No manufacturer is going to spend the money on such a device that will be markedly more expensive to procur than a straight piece of wire. And that's before he/she starts thinking about setting up a machine to populate a printed circuit board with these things - straight wires are not too much easier to orient and insert, but they don't offer the ability to make a mistake, like putting in an incorrect value part, and so on.
I put this on the same level as vintage cloth-covered wire, honking-huge "orange drop" Sprague caps, and other sundry "only way to get that killer tone" components. IOW, I hold naught but the highest disdain for this type of crass profiteering.
I feel a rant coming on, I better leave right now......
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Post by frets on Dec 17, 2019 2:34:51 GMT -5
I’m gonna buy some...
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axedoctor
Meter Reader 1st Class
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Post by axedoctor on Dec 17, 2019 11:26:15 GMT -5
Description: A zero-ohm link or zero-ohm resistor is a wire link used to connect traces on a printed circuit board that is packaged in the same physical package format as a resistor. Someone made this for profits only, you can take that to the bank. No manufacturer is going to spend the money on such a device that will be markedly more expensive to procur than a straight piece of wire. And that's before he/she starts thinking about setting up a machine to populate a printed circuit board with these things - straight wires are not too much easier to orient and insert, but they don't offer the ability to make a mistake, like putting in an incorrect value part, and so on.
I put this on the same level as vintage cloth-covered wire, honking-huge "orange drop" Sprague caps, and other sundry "only way to get that killer tone" components. IOW, I hold naught but the highest disdain for this type of crass profiteering.
I feel a rant coming on, I better leave right now......
hmmm ... maybe not so invaluable zero-ohm resistors (marked with the standard black=0 resistor code) found wide use for products with various configurations that shared a common PCB and were assembled with tape-and-reel robotic automated forming and insertion equipment - the sub-penny cost of the component becomes insignificant in the big picture handling a piece of wire likely requires configuring the assembly equipment with an additional specialized grabber/alignment tool and separate controller software sequences when opting for zero ohms vs a functional resistance, each adding operational cost its use in the pictured application does seem somewhat odd PS - this is not a rant (I wish to remain on Santa's "nice" list) |
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Post by reTrEaD on Dec 17, 2019 14:01:23 GMT -5
zero-ohm resistors (marked with the standard black=0 resistor code) found wide use for products with various configurations that shared a common PCB and were assembled with tape-and-reel robotic automated forming and insertion equipment - the sub-penny cost of the component becomes insignificant in the big picture handling a piece of wire likely requires configuring the assembly equipment with an additional specialized grabber/alignment tool and separate controller software sequences when opting for zero ohms vs a functional resistance, each adding operational cost There's that, plus the benefit of the 'jumper' being necessarily physically higher above the printed board because of the resistor-like body. In the case of a double-sided printed board, the gap between the two end connections could be used for traces. A (bare) wire jumper over these traces would be dangerously close and a likely failure (shorting) point. |
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Post by frets on Dec 17, 2019 20:26:58 GMT -5
I’m confused. Wouldn’t a zero ohm resistor be an economical way on a PCB layout to keep analog and digital grounds separate, only joined at a single point? A Star Ground of sorts? I guess that would only be one possible use. Right?
Nonetheless, it is a swindle on a guitar pot.
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Post by Deleted on Dec 24, 2019 13:57:42 GMT -5
on PCB some times we use 0 ohms as a Link
Ground if perfect should be just like a black hole and take all comers no need to split them up
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(R'n'R means 'Remove and Replace'.)
Inquiring minds wish to know....
