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Old 7th February 2013, 08:09 PM   #51
Loren42 is offline Loren42  United States
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My signal traces are .030", which even that is overkill.

The power traces are probably .040" to .050". Again, more than what is needed.
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Old 20th February 2013, 05:31 PM   #52
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Hi Everyone,

I'm getting to the point were my board layout is just about finished.

My question is:
Do I require a via where the yellow arrow is pointing or is "eagle" smart enough to put one in?

Logically, I would think so, since the capacitors terminal should be connected to both traces.

Would appreciate any comments on that.

P.S. the red lines are on the top layer and blue ones are on the bottom.

Cheers,
Chris
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Old 20th February 2013, 05:52 PM   #53
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by chris2 View Post
Hi Everyone,

I'm getting to the point were my board layout is just about finished.

My question is:
Do I require a via where the yellow arrow is pointing or is "eagle" smart enough to put one in?

Logically, I would think so, since the capacitors terminal should be connected to both traces.

Would appreciate any comments on that.

P.S. the red lines are on the top layer and blue ones are on the bottom.

Cheers,
Chris
It should be automagic.

Worse case is you may need to solder both sides, but generally, al boards have plated through holes.
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Old 21st February 2013, 08:26 AM   #54
maxw is offline maxw  United Kingdom
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You don't need a via there. A trace on the top and bottom of the PCB that is the same signal can join at any through hole, whether a via or the leg of a capacitor/resistor
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Old 23rd February 2013, 10:34 AM   #55
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Thanx guys for your suggestions, ;-)

A couple of other points I've been thinking of...

1. should i add an adj. gain, e.g. a small pot for an additional +6db gain to the buffer?
2. do you guys use sockets for the chips, or do you solder them directly to the board?

I don't think I will req. additional gain, but it would be relatively easy to add?

Typically I'm a KISS kind of a guy, only add what u need however it would possibly
make the board a bit more generic.

Cheers,
Chris
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Old 23rd February 2013, 11:49 AM   #56
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by chris2 View Post
Thanx guys for your suggestions, ;-)

A couple of other points I've been thinking of...

1. should i add an adj. gain, e.g. a small pot for an additional +6db gain to the buffer?
2. do you guys use sockets for the chips, or do you solder them directly to the board?

I don't think I will req. additional gain, but it would be relatively easy to add?

Typically I'm a KISS kind of a guy, only add what u need however it would possibly
make the board a bit more generic.

Cheers,
Chris
KISS says solder in the chips and do not use a variable resistor.

Trimpots are notoriously fragile components and a source for noise. Use them only when absolutely necessary. Removing and replacing a through hole resistor is pretty easy if gain proves to be inadequate. Or, put a trimpot in temporarily and set the gain, pull the pot - measure it - and replace with a fixed resistor.

I would solder my chips because sockets are another weak link that requires a good gas-tight fit between component lead surface and the socket. If that gets compromised, oxidation on the metal will reduce the electrical contact between chip lead and socket.

I also would solder my chips because I have the equipment to remove through hole and surface mount components.

Lastly, you need to consider how often you will be replacing the chip. Chances are it will be never, so sockets just add cost and a small reliability liability that you do not need to carry.

I am not a believer in rolling chips, so I would design it for the intended chips and be done with it.

That is just my opinion. Your needs and feelings may be different.
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Old 24th February 2013, 11:00 AM   #57
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Thanx Loren42 for ur candid response.

I will def. leave the pot and the sockets out.

Probably won't add the optional traces / pads for gain setting resistors either.

Cheers,
Chris
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Old 25th February 2013, 10:39 AM   #58
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Hi everyone,

I think I have my board layout nearly complete, so I will soon be having the boards made.

Here's a mockup pic of how they will look.

Cheers,
Chris
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Old 25th February 2013, 10:56 AM   #59
Loren42 is offline Loren42  United States
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Quote:
Originally Posted by chris2 View Post
Hi everyone,

I think I have my board layout nearly complete, so I will soon be having the boards made.

Here's a mockup pic of how they will look.

Cheers,
Chris
Nicely done.
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Old 26th February 2013, 10:45 AM   #60
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Hi,

another question for the experts here.

My main signal traces or better the majority of them are on the top surface where the components are located. My bottom layer has only a few, maybe 5 signal traces.

What do u-all think, should i swap them, e.g. put the majority of the traces on the bottom side?

Does this have any advantages, e.g. like less interfernce with the components?


If that's the case, is there an easy way to swap them with eagle w/o having lay them out again on the bottom layer?

Thanx Again,
Chris
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