I was nosin' around the net for parts deals and stumbled on a resistor assortment :
http://www.opamp-electronics.com/catalo ... p-758.html
They have a 0 ohm resistor. Wouldn't this be a... wire? What would you possibly use this for? Or, is this a typo?
Kevin
0 ohm resistor???
- Dave Dixon
- Posts: 436
- Joined: Thu May 01, 2003 1:01 am
- Location: Wichita, KS
- Contact:
I remember the first time I ran across these... I thought it seemed like an oxymoron! A couple of uses for these. Ever have just ONE trace that you can't seem to route? Jumper over a trace with a "zero ohm resistor". We also use these for a multiple purpose PCB. Install a "jumper" here or there - for example to a microcontroller - and you have a permanent method of giving the PCB the desired "personality". Just like using dip switches or those manual jumpers, but takes up a lot less space, as well as being permanent. I hope I explained these uses well... It's first thing in the morning. Hope this helps,
Dave
Dave
-
- Posts: 458
- Joined: Thu Feb 05, 2004 1:01 am
- Location: Minneapolis, MN
- Contact:
Yes, I've seen 0 Ohm resistors used in consumer equipment 25 years ago. I guess shorting wires don't come on tape or reel for the insertion machines.Engineer1138 wrote:Zero ohm resistors are jumpers, but they are made so they can be handled by automated pick&place machines.
These 0 Ohm resistors are also useful for CAD schematics. Some (All?) AD and DA converter ICs require that the digital ground and analog ground planes be connected together at the AD IC. CAD programmes (like Orcad) will choke when you short 2 nets with different names together, so you have to install the 0 Ohm resistor as a kluge.
Bob
-
- Posts: 1263
- Joined: Wed Dec 05, 2001 1:01 am
- Location: Harviell, MO (Poplar Bluff area)
- Contact:
Al;though the automated insertion equipment could be modified to handle plain-wire jumpers, they're usually ready to go for the 1/4-watt resistor package, so it's cheaper to do it that way.
The devices are also good for simulating shorted capactors, however the zero impedance inductors would depend upon the frequency. At a possible 1 nH, I believe you would have around 62 ohms of inductive reactance at 10 GHz.
Dean
The devices are also good for simulating shorted capactors, however the zero impedance inductors would depend upon the frequency. At a possible 1 nH, I believe you would have around 62 ohms of inductive reactance at 10 GHz.
Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
I used to use them a lot when I was a Field Service technician, many moons ago. On the old computers we used them to configure jumper settings on system boards, old Digital (aka DEC) PDP-08 and PDP-11 systems. They were the ones that had the brown casing and single black stripe, always had a bunch in the tool bag.
The funny part about your link was they have a 5% tolerance
The funny part about your link was they have a 5% tolerance
- Dave Dixon
- Posts: 436
- Joined: Thu May 01, 2003 1:01 am
- Location: Wichita, KS
- Contact:
I have used one in a hobby project. I wanted to keep a simple board single sided, and had one stupid trace that I couldn't route for the life of me! I felt like I was cheating, but using it as a jumper over a trace on my board saved either several hours of re-routing, or going to a double sided PCB.
- Janitor Tzap
- Posts: 1721
- Joined: Sat Aug 12, 2006 5:17 pm
- Contact:
Yup,
seen a lot of 0 ohm resistors used in VCR's, Tuner Packs, Power Supplies.
In the power supply circuit they would act as a fuse.
In many CamCorders it is used for a fuse.
You could just replace it with a wire.
But, in one case I remember that when I did that.
The Camcorder came back with a burned out Capstan Motor Drive IC.
That the 0 ohm resistor was designed to blow if the Capstan Motor starts to draw more current than the normal .5 amp.
Ended up that the bearings on the Capstan Motor were worn out, causing the 0 ohm resistor to blow.
After some checking with suppliers.
I found that I couldn't just replace the Capstan Motor Bears, and the blown Drive IC.
I had to buy a complete Capstan Motor Assembly for the Camcorder.
Which was going cost over $100.00 plus my time and labor.
So, that CamCorder ended up in the junk pile.
Signed: Janitor Tzap
seen a lot of 0 ohm resistors used in VCR's, Tuner Packs, Power Supplies.
In the power supply circuit they would act as a fuse.
In many CamCorders it is used for a fuse.
You could just replace it with a wire.
But, in one case I remember that when I did that.
The Camcorder came back with a burned out Capstan Motor Drive IC.
That the 0 ohm resistor was designed to blow if the Capstan Motor starts to draw more current than the normal .5 amp.
Ended up that the bearings on the Capstan Motor were worn out, causing the 0 ohm resistor to blow.
After some checking with suppliers.
I found that I couldn't just replace the Capstan Motor Bears, and the blown Drive IC.
I had to buy a complete Capstan Motor Assembly for the Camcorder.
Which was going cost over $100.00 plus my time and labor.
So, that CamCorder ended up in the junk pile.
Signed: Janitor Tzap
-
- Posts: 2277
- Joined: Wed Nov 24, 2004 1:01 am
- Location: ASHTABULA,OHIO
- Contact:
"I have used one in a hobby project. I wanted to keep a simple board single sided, and had one stupid trace that I couldn't route for the life of me! I felt like I was cheating, but using it as a jumper over a trace on my board saved either several hours of re-routing, or going to a double sided PCB."
Dave, it also makes it look like just another component and not an "OOPS". The end result is the board still looks highly professional!
Dave, it also makes it look like just another component and not an "OOPS". The end result is the board still looks highly professional!
Who is online
Users browsing this forum: Ahrefs [Bot] and 0 guests