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From: email@example.com (Gibbo)
Date: 16 Dec 2002 19:33:10 GMT
Organization: AOL, http://www.aol.co.uk
Subject: Re: O ohms in Schematic
firstname.lastname@example.org (Shahrad) wrote:
>I want to know what's the meaning of the 0ohms (zero ohms) resistor in
>some electronic schematic especially the ones that base on high speed
>processor, like the sample schematic board for PXA250 from Intel?
>Thanks in advance for any reply.
Various reasons for using these zero ohm "resistors". Here are a few reasons I
use them. No doubt others will have other reasons.
Sometimes a wire link is required simply because pcb space won't allow any
other way of doing it. A zero ohm resistor is easier to place for automatic pcb
stuffing machines than a piece of wire..
The same pcb may be used for various different versions. Some of which require
a certain resistor value, some of which require a link.
They can (if the pcb traces are the correct size) be relied on to blow in
certain fault conditions rather than burning a pcb trace. A bit rough-ass, but
it is done.
As a means, in later life, to interrupt a circuit to insert say, an amp meter
or a current limiting device while carrying out service or repair. Obviously
this only applies to equipment that is expensive and therefore liable to be
repaired as opposed to thrown away.
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