On Thursday 21 September 2006 16:08, Dave McGuire wrote: > On Sep 21, 2006, at 10:32 AM, Giorgenes Gelatti wrote: > > I'm new to electronics, geda and this list. > > I've read some tutorial in the net but end up with this question: > > I've done a simple schematic in geda and exported it to PCB via > > gsch2pcb. > > After drawing the soldering lines by hand in pcb I got to a situation > > where there > > was no path to connect the other components without crossing another > > line. > > And I couldn't find a way to make a "jump" over the other lines. > > > > Is there a way to do that in PCB? Or should I put some "jumper" > > component in schematic? > > Hi Giorgenes...The common way to do this is to use a trace on the > other side of the board, with two vias to connect it. > > If you're designing a single-sided board, the electronics world has > come up with the bizarre concept of the "zero-ohm resistor" to take > care of this...it's quick & easy to place a resistor spanning the line > that must be crossed, then solder a jumper wire across it. Some > manufacturers even make actual "zero-ohm resistors" (which of course > aren't *exactly* zero ohms!) which look like real resistors...the ones > I've seen have a single black band around them. There are > surface-mount versions of these as well. Just a note -- other uses for zero-ohm resistors are: - on boards where there are more than one ground plane (e.g. analog and digital ground), a zero-ohm resistor is often used to bridge them in a single place - sometimes on high-frequency signal paths you think you'll probably need a termination resistor, but you're not sure. If you decide you don't, you can fit a zero-ohm resistor over the pads In general, try and use the minimum possible number of vias in signal traces, and let the ground and power traces hop around between layers. Peter -- Fisher Society publicity officer http://tinyurl.com/o39w2 CUSBC novices, match and league secretary http://tinyurl.com/mwrc9 Quake II build tools maintainer http://tinyurl.com/fkldd v3sw6YChw7$ln3pr6$ck3ma8u7+Lw3+2m0l7Ci6e4+8t4Gb8en6g6Pa2Xs5Mr4p4 hackerkey.com
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