electronics - unusual resistor value :-)

[dave]

0.5R

:-)

[Bob Eager]

Pretty normal to have these - but 0.5R is well outside the tolerance (any tolerance!)

[Dave Plowman (News)]

They'll also only be 0 ohm at the stated temperature. The resistance will increase with heat - which may be useful.

The zero ohm as a link thingie is quite common with surface mount - but these are conventional components so I doubt that's their main purpose in this case. As plenty such factory boards have wire links.

[Man at B&Q]

Machines were used long before SMD's recent popularity (gull wing smd packages have been around for donkeys years but tended to be restricted to military and space applications). I see no reason why the same machines that stuff old fashioned through hole components from bandoliers can't also stuff wire links.

MBQ

[The Natural Philosopher]

well they couldn't..and that's the point. making something up that was shaped like a resistor was a whole lot easier.

Also, finger insertion is much harder with a wire link.

Also wire links laying across open tracks are not a good idea. Even if there is an insulating resist.

So the wire link shaped like a resistor and covered in insulation, was the simplest way out.

[Andy Burns]

It's a 403 noww, I presume it was a surface mount 0 ohm resistor? Normal to use them as links ...

[Man at B&Q]

Is that what the picture was? the link is broken so I haven't seen it yet.

MBQ

[Bob Minchin]

More like that is the resistance of your multimeter leads. To get an accurate result you need a 4 terminal resistance meter.

Bob

[alexander.keys1]

That's right, the actual resistance will be measured in milli-ohms, it's just a very short length of tinned copper wire with a resistor- shaped piece of plastic around it. It's about the same as a 15-amp fuse wire, enough resistance to get hot with 15A passing through, and to melt with 30A.

[geoff]

In message , dave writes

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You don't have permission to access /pics/zeroohms.jpg on this server.

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[Alan Braggins]

No, packaged more like this:

which has a picture of a surface mount one too.)

Same basic idea though. Link in package that can be handled by the same equipment as resistors.

[Man at B&Q]

Try

[dave]

sorry - should be back now.

[Terry Casey]

Oh, I like the 1% tolerance ...!

[fred]

In article , Man at B&Q writes

more expensive in production. If you've only a few links and are already using automated through hole insertion equipment then it makes sense to stick with bandoliered component links and a single machine process.

[Andrew Gabriel]

and be careful not to exceed 1/4 W...