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Making my first sch and board: Grado ra-1 clone.
Making my first sch and board: Grado ra-1 clone.
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Old 14th January 2018, 08:25 PM   #1
nenad88 is offline nenad88
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Smile Making my first sch and board: Grado ra-1 clone.

This is my first project and i think it is best project to start with and learn. I found sch of this amp on internet but it only shows one channel. I have no clue how to recreate schematic from picture so i created my own. Am I doing this right or did I make any mistakes? Thanks
Click the image to open in full size.
Click the image to open in full size.
I have left out pot and input caps because they are going to be offboard.

Finished Grado RA-1 Clone:

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Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.

Last edited by nenad88; 17th January 2018 at 08:40 AM.
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Old 15th January 2018, 09:18 AM   #2
nenad88 is offline nenad88
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Click the image to open in full size.
I think this one is better.
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Old 15th January 2018, 10:20 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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Your schematic is very poor.
It should be more like the second picture.
My software allows you to split power supply and op-amp parts of IC.
This makes it much easier to read and see mistakes.
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Old 15th January 2018, 10:35 AM   #4
nenad88 is offline nenad88
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I dont know how to create only one channel in sch and transfer that to 2 channels on board. Im learning eagle now. Can i use ic symbol for njm4556 like in second pic instead of dip8 that im using now.
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Old 15th January 2018, 10:45 AM   #5
nigelwright7557 is offline nigelwright7557  United Kingdom
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In my software you put down two amplifiers and a power supply.
Then use a separator line so the software knows they should treat separately.
Then you can move around the parts as required to make a neater layout.
You should be able to do that in Eagle.

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Old 15th January 2018, 10:56 AM   #6
nenad88 is offline nenad88
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I am watching tutorials for some random ic's and it seems that eagle schematic shows them just like that ic on my picture.
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Old 15th January 2018, 11:01 AM   #7
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by nenad88 View Post
I am watching tutorials for some random ic's and it seems that eagle schematic shows them just like that ic on my picture.
That's the wrong way to do it.
Very amateur.
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Old 15th January 2018, 11:06 AM   #8
nenad88 is offline nenad88
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An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

This is what i want. Ill maybe ask Richard for tips.
http://www.diyaudio.com/archive/blog...ps-50c-sch.png

Last edited by nenad88; 15th January 2018 at 11:07 AM. Reason: K
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Old 15th January 2018, 11:09 AM   #9
ivanlukic is offline ivanlukic  Serbia
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In Eagle you should use, for instance, Burr Brown library and select footprint for OPA2134 which will give you two indipendent single opamp footprints with marked power supply pins on one of them. You can change the value of component to the NJM4556 later.
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Old 15th January 2018, 11:10 AM   #10
nenad88 is offline nenad88
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Hvala/tnx
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