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0 ohm 1206 resistors to cross over tracks

10 Jan 2012

Smitjs

South Africa

Hi,

I use 0 ohm resistors to cross over tracks on the pcb.

It appears that the router does not understand this.

Please explain the correct use of these resistors in DesignSpark withou problems with the router.

Thank you

Johan Smit

Replies

Boss

United Kingdom
17 weeks ago

Hi, as an update to your question and a get to know the library better, I thought I would try to generate a library componet that may help. It is throgh hole but could be SM as well.

Have a look at http://www.designspark.com/knowledge/ds-pcb-link-or-wire-jumper

My aim was to provide a two terminal variable length pck package to allow customisation at the PCB layout stage.

Let me know if it helps and feel free to modify and update as required.

Boss

United Kingdom
18 weeks ago

As JGMartinez states:-

Layout your pcb route and when you come to a point that you need a zero ohm link, STOP.

Go back to the schematic and add a resistor of the  footprint and size you want (value 0ohms).

Select "Forward Design Changes" under "Tools" to get the new zero ohm resistor on the pcb in the signal line that you want, just place where you want the link/jumper.

Always do changes from the schematic and "forward design changes" to the PCB.

jgmartinez

Spain
18 weeks ago

You have to add your electrical drawing the jumper part, it may be a resistor or a new part designed for. Then the PCB footprint may be a 1206, a piece of wire from 0.1 to several tenth of inch as you need, etc. If not included in electrical drawing the DS will not allow you route and report errors because you added parts in PCB unknown in electrical drawing so netlists do not match. This technique is heavy due to while routing you’ll need upgrade the electrical drawing constantly by moving the jumper parts or adding/removing them.

Bugs Bunny

Belgium
18 weeks ago

If you create a new conponent, a false resistor of "123456" ohms with the size of the wire you use. I guess it will work.

daveegg

United Kingdom
18 weeks ago

What you are doing effectively is placing links.  DesignSpark PCB doesn't support links and accordingly this will confuse the Autorouter.

Smitjs

South Africa
17 weeks ago

Thanks guys, that makes it clearer.

I added pads, then connected the pads to the 0 ohm 1206, converted pads to vias, then connected them on the other layer. Then moved the vias over the 1206 resistor. A bit long way around, but then the router understands it. Before printing, remove the vias.