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EAGLE User Chat (English) Could someone check my design?
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Related

Could someone check my design?

jacob-t
jacob-t over 8 years ago

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

Attachments:
opamp.zip
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  • jacob-t
    jacob-t over 8 years ago in reply to kikoun +1
    The opamp is meant to amplify a 7-50mV signal around 100 times so I can reliably read it with a National Instruments DAQ. I'm sorry I'm such a newbee, any and all help is really appreciated! I'll try and…
  • kikoun
    kikoun over 8 years ago in reply to jacob-t +1
    Hmmm not sure i got the capcitors right. ;-) Partially... For the 5µF capacitor: it's connected correctly in schematic, but I'm not sure you will found a value of 5µF, but a value of 4,7µF, 10µF, 22µF…
  • kikoun
    kikoun over 8 years ago in reply to jacob-t +1
    Hi, That last design is better, the ground plane is OK.. You remove the big capacitor (your 5µF) I suggested to check the value and the package, but not t remove it ? If it was one of my design I would…
  • gadget.iom
    gadget.iom over 8 years ago

    Just have a look at your component placement. For example, switching the positions of R1 and R2 may improve your track routing.

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  • autodeskguest
    autodeskguest over 8 years ago

    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

     

    --

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

    http://www.element14.com/community/message/162669

     

    Attachments:

    opamp.zip

     

     

    No capacitors?

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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  • jacob-t
    jacob-t over 8 years ago in reply to autodeskguest

    You mean to filter the input?

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  • kikoun
    kikoun over 8 years ago in reply to jacob-t

    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

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  • jacob-t
    jacob-t over 8 years ago in reply to kikoun

    The opamp is meant to amplify a 7-50mV signal around 100 times so I can reliably read it with a National Instruments DAQ.

     

    I'm sorry I'm such a newbee, any and all help is really appreciated! I'll try and add some capacitors to the diagram and see if I can work out how to add a GND plane :-)

     

    I'll be back ;-)

     

    Thanks

    Jacob

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  • jacob-t
    jacob-t over 8 years ago in reply to jacob-t

    Hmmm not sure i got the capcitors right. ;-)

     

    How's this version?

     

    Thanks again

    Jacob

    Attachments:
    test4.zip
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  • autodeskguest
    autodeskguest over 8 years ago in reply to jacob-t

    Am 08.10.2015 um 14:43 schrieb Jacob Thastrup:

    Hmmm not sure i got the capcitors right. image

     

    How's this version?

     

    Thanks again

    Jacob

     

    --

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

    http://www.element14.com/community/message/162771

     

    Attachments:

    test4.zip

     

     

     

    Where is your attachment???

    Anyway I didn't like the many junctions and the separated connectors in

    the schematic,

    so I messed around in your design (as an example of course). Same went

    for the board image

    I also changed the width of the tracks, because I suppose you want to

    etch yourself...

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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  • jacob-t
    jacob-t over 8 years ago in reply to autodeskguest

    Hi Joern

    Maybe I'm getting it wrong. But I don't see any files from you?

    Thanks

    -Jacob

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  • kikoun
    kikoun over 8 years ago in reply to jacob-t

    Hmmm not sure i got the capcitors right. ;-)

     

    Partially...

     

    For the 5µF capacitor: it's connected correctly in schematic, but I'm not sure you will found a value of  5µF, but a value of 4,7µF, 10µF, 22µF, 47µF... are standardized values . Did you check if you use the good package ? often this king of capacitor have a cylinder shape, and it polarized (+ shoufd be connected to +24V, and - to GND)

    A good advice would be to found a capacitor (buy it or at least found were you will buy it), so you be sure of the value, the dimensions, the shape, if it's polarized or not....

    The physical position on the board doesn't really mater for that capacitor.

     

    For the 2 others, It's NOT OK: you need only one capacitor, and it should be in parallel not in series with LM324 :

         -> in schematic : you connect the +V pin (pad number 4) of the LM324 directly to +24V, and do the same with the GND pin (pad number 11), connect directly to GND. Then you add your 100nF capacitor and connect one pin to +24V, the other one to GND

         ->  in board, you place physically this capacitor near the LM324, the nearest is the best.

     

    The role of these capacitor is :

    - filter noise coming from your supply.

    - provide a local reserve of energy for you amp : when the amp will need to swing is output, it will sink current, and will need fast, and if there is no capacitor around, the current will flow from your supply through your cable and the copper of your board. With ideal wire no problem. but in real life, they have a little resistance and inductance: both will slow down current flow, and the voltage of the supply near the LM324 will goes down....

     

    That why a good practice is to add :

    - 1 huge capacitor (10µ - 100µF) for the board: it's provide energy for 'slow' consumption raises, and filter low frequency noise from the power supply...

    - 1 little capacitor for each integrated circuit (chip), near the chip,  for fast consumption variations, and filter for higher frequency noise...

     

    This is only a very very simplified explanation and complex design need more than this little cook book, but in you case that could be a good start !

    That also why you need to have larger wire for supply than for the other signal.

     

    Guillaume.

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  • autodeskguest
    autodeskguest over 8 years ago in reply to jacob-t

    Am 08.10.2015 um 17:38 schrieb Jacob Thastrup:

    Hi Joern

    Maybe I'm getting it wrong. But I don't see any files from you?

    Thanks

    -Jacob

     

    --

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

    http://www.element14.com/community/message/162826

     

     

    I attached it but I suppose it is the glorious interconnection between

    the newsgroup and element 14 that never works since years...

    Next try now...

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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