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
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
opamp.zip |
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
You mean to filter the input?
Am 08.10.2015 um 14:43 schrieb Jacob Thastrup:
Hmmm not sure i got the capcitors right.
How's this version?
Thanks again
Jacob
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To view any images and attachments in this post, visit:
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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
I also changed the width of the tracks, because I suppose you want to
etch yourself...
--
Mit freundlichen Grüßen / With best regards
Joern Paschedag
Hi Joern
Maybe I'm getting it wrong. But I don't see any files from you?
Thanks
-Jacob
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.
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
Am 09.10.2015 um 10:42 schrieb Joern Paschedag:
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...
No, sorry it didn't go throu, maybe because I'm not registered at
element14 .
And I'm not interested to register there.
--
Mit freundlichen Grüßen / With best regards
Joern Paschedag
On 09.10.2015 11:12, Joern Paschedag wrote:
Am 09.10.2015 um 10:42 schrieb Joern Paschedag:
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...
No, sorry it didn't go throu, maybe because I'm not registered at
element14 .
And I'm not interested to register there.
You can find them here
http://www.eaglecentral.ca/forums/index.php/t/51848/5abd43c14367c14cffef482390e897d4/
Once again thank you guys!!
Guillaume, thank you for the explanation it really helps!
I've added a ground plane to Joern's design... does that make sense?
I hope you can see the attached file..otherwise I'll go register at eaglecentral as well.
-Jacob
test5.zip |
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 put a 10µF electrolytic capacitor between GND and +24V, just right after the supply connector...
Nice work ....
Am 09.10.2015 um 18:34 schrieb Jacob Thastrup:
Once again thank you guys!!
Guillaume, thank you for the explanation it really helps!
I've added a ground plane to Joern's design... does that make sense?
I hope you can see the attached file..otherwise I'll go register at
eaglecentral as well.
-Jacob
--
To view any images and attachments in this post, visit:
http://www.element14.com/community/message/162904
Attachments:
test5.zip
You should go there anyway. It is just the better link to the cadsoft
They don't have trouble with attachments (as you have seen).
BTW my "design" was just a suggestion.
Maybe you should add an electrolytic capacitor in general and foresee
some holes to screw this print somewhere.
--
Mit freundlichen Grüßen / With best regards
Joern Paschedag
Am 09.10.2015 um 18:34 schrieb Jacob Thastrup:
Once again thank you guys!!
Guillaume, thank you for the explanation it really helps!
I've added a ground plane to Joern's design... does that make sense?
I hope you can see the attached file..otherwise I'll go register at
eaglecentral as well.
-Jacob
--
To view any images and attachments in this post, visit:
http://www.element14.com/community/message/162904
Attachments:
test5.zip
You should go there anyway. It is just the better link to the cadsoft
They don't have trouble with attachments (as you have seen).
BTW my "design" was just a suggestion.
Maybe you should add an electrolytic capacitor in general and foresee
some holes to screw this print somewhere.
--
Mit freundlichen Grüßen / With best regards
Joern Paschedag