Making my first sch and board: Grado ra-1 clone.

[nenad88]

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

I have left out pot and input caps because they are going to be offboard.

Finished Grado RA-1 Clone:

 

[nenad88]

I think this one is better.

 

[nigelwright7557]

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.

 

[nenad88]

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.

 

[nigelwright7557]

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.

An externally hosted image should be here but it was not working when we last tested it.

 

[nenad88]

I am watching tutorials for some random ic's and it seems that eagle schematic shows them just like that ic on my picture.

 

[nigelwright7557]

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.

 

[nenad88]

An externally hosted image should be here but it was not working when we last tested it.

This is what i want. Ill maybe ask Richard for tips.
http://www.diyaudio.com/archive/blo...4714-stereo-vsps-rev-50c-pcb-vsps-50c-sch.png

 

[ivanlukic]

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.

 

[nenad88]

Hvala/tnx

 

[nenad88]

[/IMG]

is this better?

 

[JPS64]

don‘t put component value into symbol.
Inputs left, outputs right.
VCC top, VSS and GROUND bottom.
Rotate 90 degrees components to power.

JP

 

[schillg11]

hi,

it would be nice not mix the two worlds,

Vcc and Vee for the bipolars (collektor and emitter)
Vdd and Vss for MOSFET (drain and source)

BR
GS

 

[nenad88]

i couldnt fit 2 caps near power pins so i tried to to make that part separate, but i really dont know how to do that

this picture shows how far i got

 

[nenad88]

[/IMG]

on orignal hp amp ground is only 1 trace on back of the board, should i make same or make whole bottom side as ground then add power gnd and input and output gnd pins?

 

[nenad88]

 

[nenad88]

So i created pcb and here are pictures.

 

[ammel68]

Looking at the traces on the bottom of your board above(last photo post 17), I personally try to avoid "T" intersections of traces like you have lower and upper center and near the bottom on the right side.
Some people think it doesn't make any difference one way or the other, but I don't think it's a good layout practice.
Just my .

 

[nenad88]

Thanks @ammel68

I have updated and changed a bit traces and board.

 

[nenad88]

Changed traced to top layer