Could someone check my design?

Am 07.10.2015 um 14:02 schrieb Jacob Thastrup:

Hi Guys

I'm totally new to this. I'm trying to build a 4 channel opamp (boost my

signal about 100x)

I'm hoping someone has the time to quickly check my design and see if it

makes sense and perhaps let me know how to improve it.

 

Thanks

Jacob

 

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Attachments:

opamp.zip

 

No capacitors?

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Mit freundlichen Grüßen / With best regards

Joern Paschedag

You mean to filter the input?

Hi,

At least capacitors should be added on the supply...

I don"t know the purpose of your circuit but you should add at least a small one capacitor (10 to 100 nF) placed near the power supply input pins of the LM324, and a electrolytic caacitor (few µF) rignt after the supply input connector.

En large 24V supply trace, and for the GND you can enlarge the trace or better add a GND plane (polygon).

Guillaume

hi,

I've viewed your layout and edit it.

some tips for your next pcb

* first of all: place parts, route power supply & gnd, critical tracks like bus and the all the other things

* layout the pcb by following your nets of the schematics

* try parts in different ways THT (horizontal / vertical) or SMD

* route the tracks as short as possible

* place holes to fix or parts to screw your pcb on something

An example off your pcb with short tracks, etc. is attached.

Guillaume barrey[1

wrote on Wed, 14 October 2015 13:10]Hi,

 

That's Great !

Just a last little advice for the GND plane.

When my board is almost finish, I do some little adjustment to be sure

that my GND plane will be good.... It's hard to explain with my poor

English....(sorry to be a French frog:p)

I hide all layer except the dimension, via, pads and the copper layer

on

which I work, and I run a ratsnest command to process the polygons

Then you use the show command and select the polygon (in your case

you

only have GND). The polygon is highlighted so you can see it well.

Now you try to imagine how the current can flow from here and there...

Sometime you will see that for connecting to  point that are not

really

far from each other, the current need to do a huge travel because the

plane is interrupted by some other tracks. Sometime it's easy to

reduce

drastically the effective distance just by moving a little bit a track

or a part.

 

In your example, the +24V track going from C1 to IC1 completely cut he

polygon. If you move down a little this track, the GND plane will be

not

cut any more...

 

That way, I check all the little improvement I can do, and some time

it's not enough, so I reduce the isolation or the wire of the polygon.

 

I do that for all polygons, layer by layer (copper layers of course).

 

But any way good job !

 

Guillaume.

 

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To view any images and attachments in this post, visit:

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Hi Guys

Sorry for the slow response.

Thank you all for all the help. I feel I have learned a lot already!

Best wishes

Jacob

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Hi,

That's Great !

Just a last little advice for the GND plane.

When my board is almost finish, I do some little adjustment to be sure that my GND plane will be good.... It's hard to explain with my poor English....(sorry to be a French frog)

I hide all layer except the dimension, via, pads and the copper layer on which I work, and I run a ratsnest command to process the polygons

Then you use the show command and select the polygon (in your case you only have GND). The polygon is highlighted so you can see it well.

Now you try to imagine how the current can flow from here and there...

Sometime you will see that for connecting to  point that are not really far from each other, the current need to do a huge travel because the plane is interrupted by some other tracks. Sometime it's easy to reduce drastically the effective distance just by moving a little bit a track or a part.

In your example, the +24V track going from C1 to IC1 completely cut he polygon. If you move down a little this track, the GND plane will be not cut any more...

That way, I check all the little improvement I can do, and some time it's not enough, so I reduce the isolation or the wire of the polygon.

I do that for all polygons, layer by layer (copper layers of course).

But any way good job !

Guillaume.

Hi,

That's Great !

Just a last little advice for the GND plane.

When my board is almost finish, I do some little adjustment to be sure that my GND plane will be good.... It's hard to explain with my poor English....(sorry to be a French frog)

I hide all layer except the dimension, via, pads and the copper layer on which I work, and I run a ratsnest command to process the polygons

Then you use the show command and select the polygon (in your case you only have GND). The polygon is highlighted so you can see it well.

Now you try to imagine how the current can flow from here and there...

Sometime you will see that for connecting to  point that are not really far from each other, the current need to do a huge travel because the plane is interrupted by some other tracks. Sometime it's easy to reduce drastically the effective distance just by moving a little bit a track or a part.

In your example, the +24V track going from C1 to IC1 completely cut he polygon. If you move down a little this track, the GND plane will be not cut any more...

That way, I check all the little improvement I can do, and some time it's not enough, so I reduce the isolation or the wire of the polygon.

I do that for all polygons, layer by layer (copper layers of course).

But any way good job !

Guillaume.

Guillaume barrey[1

wrote on Wed, 14 October 2015 13:10]Hi,

 

That's Great !

Just a last little advice for the GND plane.

When my board is almost finish, I do some little adjustment to be sure

that my GND plane will be good.... It's hard to explain with my poor

English....(sorry to be a French frog:p)

I hide all layer except the dimension, via, pads and the copper layer

on

which I work, and I run a ratsnest command to process the polygons

Then you use the show command and select the polygon (in your case

you

only have GND). The polygon is highlighted so you can see it well.

Now you try to imagine how the current can flow from here and there...

Sometime you will see that for connecting to  point that are not

really

far from each other, the current need to do a huge travel because the

plane is interrupted by some other tracks. Sometime it's easy to

reduce

drastically the effective distance just by moving a little bit a track

or a part.

 

In your example, the +24V track going from C1 to IC1 completely cut he

polygon. If you move down a little this track, the GND plane will be

not

cut any more...

 

That way, I check all the little improvement I can do, and some time

it's not enough, so I reduce the isolation or the wire of the polygon.

 

I do that for all polygons, layer by layer (copper layers of course).

 

But any way good job !

 

Guillaume.

 

--

To view any images and attachments in this post, visit:

http://www.element14.com/community/message/163345

Hi Guys

Sorry for the slow response.

Thank you all for all the help. I feel I have learned a lot already!

Best wishes

Jacob

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.