should i use a double sided board and mirrior the same circuit on both sides?

[Shaun Perez]

Should i use a double sided board and mirrior the same circuit on both sides? Is this a bad idea? I know that it will lower resistance but will it have any negative effects to capacitance, inductance, or EMI and noise from the parallel lines. Is a single sided board better than a double sided with parallel circuits?

[halojoy]

If it was good, generally, wouldn't this be done?
I have not seen any such PCBs

[jleaman]

id like to know also if thisis a good idea..?

[Holger Barske]

Won't be an easy thing to do. If you want an exact copy on both halves, you need to use smd components exclusively, otherwise you won't be able to place your parts where its "opponent" is.

[jleaman]

i dont think that it is hard to do at all on my fet small class ab amps there is doubble sidded one side is the pcb and the other is a ground plane. works realy well.

J'

[halojoy]

Originally posted by HBarske
Won't be an easy thing to do. If you want an exact copy on both halves, you need to use smd components exclusively, otherwise you won't be able to place your parts where its "opponent" is.

He is not going to place components on both sides.
Just doubles the copper-wires.
But I think it is better to have wider/thicker copper-rails
if you want lower resistance.
Sometimes 2 parallell rails on the board is to prefer instead of one wide.
There are PCBs with different thickness of copper.

[MRehorst]

Are you talking about putting one channel on one side of the board and the other channel on the other side? Or are you asking if you should just duplicate the layout and essentially connect the two sides in parallel?

If it is the first, I'd say it isn't a good idea. You can't very well mount through-hole components this way, and even if you use surface mount, you'll be capacitively coupling the two channels together at every node in the circuit.

If you're talking about the second configuration, I'd say it probably won't hurt, but you might be better off with a ground plane instead. One thing that is good about two layer boards is plated-through holes. They are much more reliable than non-plated-through holes, especially if you're going to end up swapping components on the board a bunch of times.

MR

[Holger Barske]

You're right, I didn't get that.
I also think it would be a better idea just to increase the copper thickness and make the tracks wider where possible.

[Shaun Perez]

Yes, I did mean putting two parallel traces on both sides with through hole components on only one side versus having only one side of copper trace

[Thomas]

Originally posted by Shaun Perez
Yes, I did mean putting two parallel traces on both sides with through hole components

... Or you could use PCB's with thicker copper laminate and save you the troubble. "Normal" PCB's are 1oz copper. You can get 2 and 3 oz copper as well, if you are worried about conductivity.

I have just made some boards for the Mini-A and they are doubble sided with groundplane on top. One advantage is that i get solder pads on both sides of the PCB, thus better mechanical stability for the components.