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Hello John.
I suppose they have to be placed in the schematic
exactly where they are needed in the layout,
Exactly. A schematic is used to document and describe your circuit, an
despite this zero ohm resistor has nothing to do with the principal
function of the circuit, it has a fundamental function at this board.
So you have to show it in the schematic, but of course, with a comment.
which can make the
schematic look very odd.
Not if you mention the following:
For creating the board, you will need this jumper as a real material
device. So for planning your materials, it should be noticed at the
BOM, which can easily done by software, if this device is mentioned at
the schematic.
Also a jumper can be a nice place for measuring or injecting signals
for trobleschooting. Another reason to show it at the schematic.
Maybe even for orientating at schematic/board. Jumpers can be good
landmarks.
There are other types of jumpers, which are not made as zero ohm
resistors for crossing, but by sockets and short circuit plugs or with
(special) solder pads and solder blobs. Of course, also by pads and
zero ohm resistors.
This Type of jumpers are by function at reality switches, and so, they
should be shown at the schematic as switches.
With best regards Bernd Wiebus alias dl1eic
Am Fri, 20 Sep 2024 17:17:59 +0100
schrieb "John Woodgate via groups.io" <jmw@...>:
Thanks, Robert. I suppose they have to be placed in the schematic
exactly where they are needed in the layout, which can make the
schematic look very odd.
On 2024-09-20 16:35, Robert via groups.io wrote:
They are normally in the schematic as zero ohm resistors.?? In the
layout they can be whatever you like, eg pukkka zero ohm resistors
(wire-ended or surface mount), hand-cut wire links, blobs of
solder, etc.
Regards,
Robert
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