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Old 4th February 2013, 04:39 PM   #41
Electrons are yellow and more is better!
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The layout doesn't match the schematics. Have you done a proper export to the pcb? Have you done any design rule check which I'm quite sure Eagle has?
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Old 4th February 2013, 04:43 PM   #42
Mooly is online now Mooly  United Kingdom
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PCB design is a very time consuming process to get right. Normally I would say audio doesn't need a ground plane... but don't let me put you off

When you actually see the board for real (print it out to scale), what looked like enourmous and wide traces will look very thin. The same goes for the component pads. Make them as big as is feasable.

Are you getting the boards made or diy-ing it all ?
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Old 4th February 2013, 05:30 PM   #43
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Thanx everyone,

guess I'll be tweaking it for a while still... Here's another update with GND plane, hope its more readable now.

I will be working on it a bit every day, staring at those traces and the schematic.

After a design rule check:
dimension, e.g. parts not lining up to grid points
overlap, looks like i have some tracks on tracks/pads, etc...
drill size issues

After an ERS check:
Power pin IC1 V+ conected to +15V
Power pin IC1 V- conected to -15V
Power pin UI -V0 conected to N$4
Power pin U1 V+ conected to +15V
Power pin U1 V- conected to -15V
Part FRAME1 has no value
Part X4 has no value

Only thing above which may be an issue is the -V0 to N$4 as far as i can tell.

Part X4 is the input power terminal strip.

Cheers,
Chris
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Old 4th February 2013, 05:35 PM   #44
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Hi Mooly,

it sure is a lot of work to do something like this! Many many
details to consider....

I plan to have the boards made by some pcb house, maybe pcb pool.

Regards,
Chris
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Old 4th February 2013, 05:38 PM   #45
Electrons are yellow and more is better!
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Vin is connected to Vout. Not good.
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Old 5th February 2013, 04:40 PM   #46
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Default Yet another layout version

Thanx peranders,

those prev. versions were def. junk! Thanx for the pointers!

The diodes in this next version should block vin from being connected to vout.

Gonna also fix those traces where the parts go through the middle of them!

Cheers,
Chris
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Old 5th February 2013, 06:27 PM   #47
Loren42 is offline Loren42  United States
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This thread is funny in that I just completed the same design - almost.

The only real difference is that I did not require an input cap for my application, but I can easily wire one from the input connector to the PCB if needed. My input impedance is 470KΩ.

The board sits in a metal box and has two XLR connector pigtails exiting the box and two RCA jacks mounted to the box.

The power supply is a simple wall wart that produces ±15VDC and I added additional filtering inside the box.

Click the image to open in full size.

Click the image to open in full size.

Here is the ground plane layer:

Click the image to open in full size.

I put it into service yesterday and it seems to work fine.

I had 3 PC boards made at ExpressPCB for about $80.

Last edited by Loren42; 5th February 2013 at 06:32 PM.
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Old 5th February 2013, 07:04 PM   #48
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Hi Loren42,

that is def. hilarious, your design is very much like mine!

I like it, esp. your layout is quite minimalistic! I hope my turns out as nice as yours.

I see your using the 2134 too, a bit more compact for stereo apps. I plan to make five of these for a surround system and put them into a single box.

I've never attempted to make a circuit board before, so its been quite an adventure. I'm using Eagle to do it and I have to say the program is quite good. You seem to have only one ground plane at the bottom. I just want to make a two layer board so my signals will be mixed or "filled-in" with the ground plane polygon. Still have to add one to the bottom layer.

I'm still trying to improve things a bit. It will a little scary to send it off not being 100% sure that its correct. I'm pretty much relying on eagle to check the design and the great people here who know so much more about this stuff than I do.

Say hi to the gators,
Chris
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Old 5th February 2013, 07:14 PM   #49
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Default Some Eagle Errors

Hi,

I got these dimension errors in eagle. My RCA jack is violating some minimal spacing distance between the ground plane and its connector....

Not sure how to fix it, since the part itself defines the spacing of its terminals??

Maybe I'll have to find a different brand to use.

Cheers,
Chris
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Old 7th February 2013, 06:58 PM   #50
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Default Almost done....

Hi everyone,

I'm getting close to finishing up the layout. Now all of my dimension errors are gone. I replaced the RCA jack with another one to accomplish that.

I also added a ground polygon to the bottom layer, which only has a few signal traces.

I made the traces to the op amp and driver stuff a little thicker but retained most of the thin ones for their pin connections.

The thicks traces are 0.066 and thin ones are 0.032. There's still quite a bit of room to increase them on the regulator side of the board, any suggestions?

Cheers,
Chris
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