Is this PCB correct ?

Thread Starter

André Ferrato

Joined Apr 5, 2015
215
Can anyone validate it for me ?

Diagram



PCB



I'm concerned about the switch ground pins, i got some errors in eagle and the airwires just disappeared, so how bad it is ?
 

jpanhalt

Joined Jan 18, 2008
11,087
With nothing labeled on the PCB, it is hard to be sure, but at first glance, it appears that you may not have done proper mirroring -- assuming your PCB rendition is what the copper layer will look like. Remember, through-hole devices are set on the non-copper side of the PCB in most cases.

Please mark the #1 IC pin or something else to give a reference point.

John
 

Thread Starter

André Ferrato

Joined Apr 5, 2015
215
Oh, of course, i'm new to this, but yes i know that devices are mounted on the non cooper side. The IC first pin is the left top one, A0. You said i may have not done proper mirroring? How so

EDIT: Oh you mean flipping the image for transfer?
 

jpanhalt

Joined Jan 18, 2008
11,087
You mentioned Eagle. It usually shows the bottom layer in Blue and the top layer in Red. What you appear to have is the bottom layer, but being in black, I can't tell. The bottom layer is assumed to be viewed through the board. That is, if you turn the board over and actually look at the bottom, it would be a mirror image.

You did not mention how you were going to make the PCB or even whether you were making it or sending it out. Some of the details in making a board can affect whether you need to flip the image or not. If you had shown the colors or even stated the colors, it would have been clearer.

Some of the errors you mention in Eagle may be because it is sensitive to layer violations. For example, if you are working on a two-layer board, you may think you have a device on the bottom layer, but Eagle may think it is on the top. Your routing will give errors in that case.

Your follow-up comment shows you are aware of that mirroring problem, so I would put my trust in Eagle. Can you be more specific about the errors Eagle gave? If you zip your board and schematic files, you can post them here. That would make review a lot easier.

John
 

Thread Starter

André Ferrato

Joined Apr 5, 2015
215
I really don't have any eagle skills and this is just a primitive thing, but i think it may be right, with your support i could correct some of my mistakes! The link to the file, i hasnt able to upload the board on the forum so i uploaded to 4shared.

EDIT: The image white and black image i uploaded first, was the pcb i intended to toner transfer on a one sided copper pcb. Note: first time doing this, 99% chance of doing it wrong!

http://www.4shared.com/rar/XmYYO1Ihce/transmitter.html?
 

MrChips

Joined Oct 2, 2009
30,621
If you are planning a DIY PCB, here are some additional tips.

1) Make your traces twice the width of what you have showing. I am guessing those are 20mil. Make it 40-50mil since you have room.

2) Use Eagle to flood a ground plane. It will be easier to etch.

btw - where are your GND connections?
 

jpanhalt

Joined Jan 18, 2008
11,087
I really don't have any eagle skills and this is just a primitive thing, but i think it may be right, with your support i could correct some of my mistakes! The link to the file, i hasnt able to upload the board on the forum so i uploaded to 4shared.
I am reluctant to download anything from 3rd party sides. Can you use ZIP and upload it here? If there is a limit for posts, I think you are probably over it.

Copper fills are neat to work with, particularly for ground connections, but for other things as well. The 90° vs. 45° for trace bends is a mechanical thing more than electrical. With a 90° bend, it is easier to snag a corner and lift a trace. Also, 45° may be shorter. I agree on trace width. There is no reason to use a narrow trace when a wider trace will fit. If you look at some of the recommended layouts for power supplies by the major manufacturers, you will see lots of copper pours with square edges. I am just a hobbyist, but here is an example of using pours for a little linear supply that I sent off recently (NB: bottom layer is not shown for clarity):

upload_2015-4-14_6-13-19.png


John
 

Thread Starter

André Ferrato

Joined Apr 5, 2015
215
Okay, this is the two files i have, the schematic and the board. I will correct the width of the paths, and about the ground connections, i thought when we left like that, it would be ground? Or i'm a wrong ? Also i uploaded the zip file now, if you could have a look and see the errors i'm getting and help me fix it, it would be nice. Thanks in advance.

 

Attachments

DerStrom8

Joined Feb 20, 2011
2,390
In the image above, why do you have that blue trace looping down between the leads of S4 when you can simply connect it to the top left pad?

PLEASE fix the 90-degree corners. It's poor practice.
 

Thread Starter

André Ferrato

Joined Apr 5, 2015
215
I'll fix it, but please, first help me fix the other things

EDIT: Because i'm new to eagle, still on tutorials and stuff.. :(
 
Last edited:

DerStrom8

Joined Feb 20, 2011
2,390
There seems to be a linking error between your schematic and your PCB. The PCB is not finding all the required nets. I suggest deleting the PCB file altogether and trying again.
 

Thread Starter

André Ferrato

Joined Apr 5, 2015
215
Understood, i'll make a new board and put it here. I thought by just connecting to the gnd in the schematic this would be done in the board.
 

MrChips

Joined Oct 2, 2009
30,621


1) Straighten your lines
2) Connect to the nearest pad
3) Make those pads as large as the allowable space. 60 thou is ok for 0.1" pitch. Why not use a 18-pin DIP package with elongated pads?
4) You have to route your GND pins or use a polygon fill labeled as GND.
 

DerStrom8

Joined Feb 20, 2011
2,390
Understood, i'll make a new board and put it here. I thought by just connecting to the gnd in the schematic this would be done in the board.
Nope, you still have to design the board. Connecting to ground in the schematic will only show you airwires (the thin yellow lines) in the PCB. You still have to do all the routing yourself.
 
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