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Old 22nd May 2009, 07:14 AM   #11
Grab485 is offline Grab485  Netherlands
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"I am trying to route all the traces for my amplifier in FreePCB for a single sided board. I have run into a problem because it seems pretty tough to route all of these traces for 50 parts "

50 parts make enough reason to use double-side PCB. If you still want to have only one side routed, I would strongly recomend to use double-side PCB with bottom layer fully dedicated to Ground net. It is easy to make and will significantly reduce 60 Hz noise. Moreover, the routing become more simple because you will use the ground layer instead PCB traces - for GND net.

If you really need help, contact me by PM.
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Old 27th May 2009, 02:32 PM   #12
Mark245 is offline Mark245  United States
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Thanks Grab. I might go with the double side board like you reccommend if I can fabricate boards like that at home. The reason I wanted to use single side is because I already purchased pcb with copper on only one side. I am hoping to fabricate the pc boards myself. I will be using the press-n-peel and I have bought the copper etchant also. Im not sure how the quality will come out. Has anyone used this technique before?
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Old 27th May 2009, 03:05 PM   #13
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Quote:
Originally posted by Mark245
Thanks for the replies. So I what part should I use for the ends of the jumpers? Can I just use a pad and then solder the wire to it? Thanks again I am kind of new to pcb layout.

mark
Most PCB software will allow you to change layer and simultaneously place a via, the track colour will change. My software just requires 2 clicks in exactly the same place. Just keep all the tracks on one side straight. You can put in a part to achieve the same effect but it's more time consuming

w
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Old 27th May 2009, 03:22 PM   #14
Grab485 is offline Grab485  Netherlands
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Quote:
Originally posted by Mark245
I will be using the press-n-peel and I have bought the copper etchant also. Im not sure how the quality will come out. Has anyone used this technique before?
There are lot of ways to make a PCB at home. So don't be afraid to try. The quality may be almost that high as on factory (of course, except metalizied vias and multilayer boards). But you need some experience.

Good luck!
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Old 27th May 2009, 07:17 PM   #15
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Quote:
Originally posted by Grab485
"I am trying to route all the traces for my amplifier in FreePCB for a single sided board. I have run into a problem because it seems pretty tough to route all of these traces for 50 parts "

50 parts make enough reason to use double-side PCB. If you still want to have only one side routed, I would strongly recomend to use double-side PCB with bottom layer fully dedicated to Ground net. It is easy to make and will significantly reduce 60 Hz noise. Moreover, the routing become more simple because you will use the ground layer instead PCB traces - for GND net.

If you really need help, contact me by PM.
One of the National Semi folks recommended avoiding the use of ground planes in audio circuits -- this was on the application note for the LM4702 amplifier. I took him up on the suggestion and began to use a ground "spider" -- with as much symmetry as possible. It does make a big difference in performance.

After a while you get used to thinking along these lines, routing as much of your power traces and ground traces along the bottom of the board as possible. Signal ground traces can be pretty thin and soon it becomes like crochet or needlepoint.

With higher frequency circuits where the supply pins have to be bypassed a ground plane is helpful -- the leads have to be as short as possible lest they become antennae radiating or receiving rfi.

It may not be pretty, but the quietest stuff I've ever built used manhattan or dead-bug construction -- and it's fast as well.
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Old 27th May 2009, 07:54 PM   #16
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50 parts too much for a single sided board ??

91 was easy while obeying the rules..
Click the image to open in full size.

As these are hand drawn , my basic gameplan is .. rails ,grounding and OPS first (the big stuff) , VAS and differentials with the shortest paths and best symmetry possible and not being afraid of a couple of jumpers to keep everything "right" (short).

Click the image to open in full size.

These were completed a few weeks ago (noise floor of LTP is higher than hum). Layout was well spaced out , easily could of done 130+ components.
OS
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