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Author Topic: 0 Ohm resistors  (Read 7464 times)

Chris Carpenter

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0 Ohm resistors
« on: March 08, 2011, 12:45:57 AM »

I keep seeing these in rack gear (DOD and Ashley specifically), typically between channels of stereo rack gear (compressors, crossovers, etc). Why use a 0 Ohm resistor rather than just a jumper?

Pic is a DOD crossover I'm playing with.



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Tim Padrick

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Re: 0 Ohm resistors
« Reply #1 on: March 08, 2011, 01:44:19 AM »

It's easier to grab, bend, and insert a 0 resistor than a piece of wire.  Especially if machinery is used to do the board stuffing.
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Chris Carpenter

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Re: 0 Ohm resistors
« Reply #2 on: March 08, 2011, 04:20:40 AM »

It's easier to grab, bend, and insert a 0 resistor than a piece of wire.  Especially if machinery is used to do the board stuffing.

That makes sense. Funny how that works out. So is it just a bit of wire with some carbon around it?
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Kevin gring

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Re: 0 Ohm resistors
« Reply #3 on: March 08, 2011, 08:08:39 AM »

That makes sense. Funny how that works out. So is it just a bit of wire with some carbon around it?
If you look at the picture closely you can see traces under the 0 ohm resistors. With uninsulated jumpers, you also run the risk of shorting to those traces.
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Bob Leonard

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Re: 0 Ohm resistors
« Reply #4 on: March 08, 2011, 08:41:25 AM »

It's easier to grab, bend, and insert a 0 resistor than a piece of wire.  Especially if machinery is used to do the board stuffing.

Bingo, but more to the point the programmer has a choice to make and the choice is simplified by choosing 0 ohm vs. red, blue, yellow, shielded, not shielded, guage type. etc. Inventory levels are obviously simplified and decreased as well.
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John Roberts {JR}

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Re: 0 Ohm resistors
« Reply #5 on: March 08, 2011, 09:34:54 AM »

Yup, these would be used primarily by factories that didn't have machine insertion capability for wire jumpers. If it cost $0.10 to hand insert a wire jumper, and $0.01 to machine insert a 0 ohm resistor, the economics made sense to pay $0.02 for the 0 ohm resistor.  At PV we could machine insert wire jumpers so didn't need to buy these trick resistors.

Note: All the wire jumpers we used were the same gauge and if you needed a higher current capability it was cheaper to just put 2 or 3 jumpers in parallel, than hand insert one larger gauge jumper (back in those days, sharp pencil cost engineering counted the cost of drilling the holes too.)

JR
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bruce gering

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Re: 0 Ohm resistors
« Reply #6 on: March 08, 2011, 09:40:22 AM »

I keep seeing these in rack gear (DOD and Ashley specifically), typically between channels of stereo rack gear (compressors, crossovers, etc). Why use a 0 Ohm resistor rather than just a jumper?

Pic is a DOD crossover I'm playing with.



Uploaded with ImageShack.us

An absolute 0 ohm resistor is an impossibility. It can be .000,001 ohms, but it will still be north of 0.  There is a resistance to everything, even superconductors. Not trying to be a snob. Just thought I'd point that out.
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Brian Ehlers

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Re: 0 Ohm resistors
« Reply #7 on: March 08, 2011, 01:03:52 PM »

An absolute 0 ohm resistor is an impossibility. It can be .000,001 ohms, but it will still be north of 0.  There is a resistance to everything, even superconductors. Not trying to be a snob. Just thought I'd point that out.
Well, as long as you want to get picky, I'll counter with the fact that the resistance of the traces leading to the "zero-Ohm" resistors is likely higher than that of the resistors.

If it makes you feel any better, the resistor manufacturers do spec them for max resistance, max current, and max power.

FYI, they're available in surface-mount as well, any size you want.
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bruce gering

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Re: 0 Ohm resistors
« Reply #8 on: March 08, 2011, 08:15:07 PM »

Well, as long as you want to get picky, I'll counter with the fact that the resistance of the traces leading to the "zero-Ohm" resistors is likely higher than that of the resistors.

Not trying to be picky, I'm just sayin...!
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Tom Fletcher

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Re: 0 Ohm resistors
« Reply #9 on: March 10, 2011, 09:27:15 PM »

These are also an outstanding way to mess with the new guy. We kept an eager young tech busy for the better part of the day swapping out "shorted" resistors until management caught on and put a quick stop to the fun. We got to donate some overtime, but it was well worth it. ;)
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Bennett Prescott

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Re: 0 Ohm resistors
« Reply #10 on: March 10, 2011, 11:48:18 PM »

These are also an outstanding way to mess with the new guy. We kept an eager young tech busy for the better part of the day swapping out "shorted" resistors until management caught on and put a quick stop to the fun. We got to donate some overtime, but it was well worth it. ;)
Ha ha ha! That's fucking killer.
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Jeff Bankston

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Re: 0 Ohm resistors
« Reply #11 on: March 17, 2011, 05:21:40 AM »

if its zero ohms how can it resist ?!!!
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ProSoundWeb Community

Re: 0 Ohm resistors
« Reply #11 on: March 17, 2011, 05:21:40 AM »


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