Dip8 2520 DOA

[Andy Peters]

i look at the trace design, long and very thin, autorouting is not the best friend of audio pcb design

I don't know whether or not the layout shown above in this thread was done by an autorouter, but given that he was trying to keep the traces to only one side of the board, the layout is reasonable. Certainly it can be tightened up by adding wire jumpers.

-a

 

[PRR]

> by an autorouter

I had assumed an ***** robot. Any human with K.I.S.S. would have un-done the top-left tangle:

 

[audiomixer]

designing PCB is an art, thanks PRR for the nice little example.

Its only by practicing and being taught the little secrets that you can make progress. but the most important thing is to build the real thing - so you'd rather etch a PCB that might be 80% optimized then to wait for the 100% perfect iteration that will never happen. you might find stuff to change anyway that will require a re-spin of your board during the process.
I did quite a lot of preliminary designs on strip board too, and of course it's helpful to master the skill of home etching PCBs.

A nice writeup about not stalling a project due to perfectionism can be read here:
http://makezine.com/2014/04/07/the-pressure-suit-chronicles/

regarding your earlier comment about ground on the DOA - you do need to connect that pin. It's not available on the single DIP8 opamp package, but that is irrelevant.

cheers    - michael

 

[Spino]

15m cable is on the low Z side, capacitive and inductive problems can be very cruel on hiZ side, long trace can be good antenna for RF, ground plane can also be a good capacitor, and so on, experiment is the best way to learn, i really hope everything will be ok for you

Thanks for the answer Kamel. Let me ask you further: in a 500 module, the width of the board is more or less 15 cm, the input are on the back and the pots are in the front (on top of that: pots and switches are usually top to bottom whereas pin layout is bottom to top). that means that usually one will have to go the whole length of the board at least a couple of times, back and forth, right? and 500 is rather small, what happens in bigger units?

 

[Kamel]

twisted cable or screened cable, you can't twist pcb trace

 

[ForthMonkey]

:-X

I'm reading what you say...I think i have research other circuits and pcbs to making my own.Cause designing is not easy for me.I should use closer ways when making pcb.Already it's my learning project.I will be learn a lot while i design this APIsh eq.

BTW i didn't understand something.I will use 2520 without GND.What is the difference between with GND or without GND?

Can i get answer for this question,please? Can i use 2520 with this design?

 

[audiomixer]

regarding your earlier comment about ground on the DOA - you do need to connect that pin. It's not available on the single DIP8 opamp package, but that is irrelevant.

cheers    - michael

I think I did.... well you can use a DOA or a single opamp - the DOA does need the additional - extra - supplementary connection to ground. all other connections are straight forward

- michael

 

[volker]

That depends on the specific DOA - a 2520 can live without a ground connection.