Dip8 2520 DOA

ForthMonkey · Apr 3, 2014

Hi

I'm trying to built 2520 for dip8 to use APIsh eq.

http://groupdiy.com/index.php?topic=55686.0

For now i want to use any single op amp.After i finished 2520 op amps,i will add to the circuit.But i have question.

It's Dip8 single op amp;

Everything is ok but which pin should i do GND for 2520?

Thanks.

mikefatom · Apr 3, 2014

The ground connection on the 2520 is actually not required. At least, it is only used for the on-board decoupling caps which are usually redundant (they are often on the main board anyway).

An op-amp (discrete or otherwise) does not have a ground connection.

Also, I'm not sure what you're trying to accomplish exactly but if you are looknig for DIP8 to 2520 footprint adapters, take a look at these:
http://www.whistlerockaudio.com/cart/index.php?main_page=index&cPath=35_53

Othewise, I believe I have already seen someone here (adechap?) do an adaptation of the 2520 with a DIP8 footprint.

Cheers,

Mike

ForthMonkey · Apr 3, 2014

mikefatom said:
The ground connection on the 2520 is actually not required. At least, it is only used for the on-board decoupling caps which are usually redundant (they are often on the main board anyway).

An op-amp (discrete or otherwise) does not have a ground connection.

Also, I'm not sure what you're trying to accomplish exactly but if you are looknig for DIP8 to 2520 footprint adapters, take a look at these:
http://www.whistlerockaudio.com/cart/index.php?main_page=index&cPath=35_53

Othewise, I believe I have already seen someone here (adechap?) do an adaptation of the 2520 with a DIP8 footprint.

Cheers,

Mike

Thanks for response.But there is only IC to DOA.I need DOA to IC.If i can't find DOA to IC,i will re-design 2520 for dip8.

audiomixer · Apr 3, 2014

I have inluded both chips into PCB design in the past and placed the smaller dip8 in the middle of the API footprint at layout. lets me choose either NE5534 or other single opamp or then later I can populate the API pins and stick in a DOA. of course all relevant pins have to be connected to both opamps in the design. ground connection on the DOA would be for decoupling caps fittet on the directly DOA. the other pins are straight forward...

- Michael

ForthMonkey · Apr 3, 2014

I'm making DOA to DIP8.Am i doing right?

joaquins · Apr 4, 2014

It's a lttle wired what you are trying to do, I understand that you want to build a 2520 and fit on an eq with has dip sockets, so the big opamp in the small socket.

If I'm right then I see at least to major problems, the first one is that usually you wouldn't have enoght space over the board to fit it, but not always of course, the other is that the dip 8 socket won't be happy to hold a DOA over it. The board from whistle may work for you, you just have to put the female pins for the 2520 and some small pins to connect to the socket.

If you are designing the main board do it already with 2520 sockets, usually they don't disturb because you could put components under it and a lot of traces.

iprovlek · Apr 4, 2014

I was tried this in my Soundcraft 200b!

Replace Tl071 with DOAs,and created some home made mini PCB for this aplication,but didnt work!

But I know what you trying to do!

But looked everywhere and never find DOA to DIP8!

Ill need this too ...

Cheers

ForthMonkey · Apr 4, 2014

Thanks for the responses.

I made something like this.

I left place to fit it.Actually there is no 2520 but i added to show.

audiomixer · Apr 4, 2014

I think he wants to temporarily put DIP8 opamps into a EQ that takes DOA, until he has the DOA ready. besides output current limitations that need to be considered this can be done. so there is the space for the DOA anyway. but of course you could ask why not just build the DOAs early. sometime it's about checking basic operation or budget.....

I designed a dual footprint so that I can vary cost / performance in a test setup. quite a difference between NE5534 and a DOA....

I looked at your layout, did not find any obvious error, I would optimize the input traces for smallest lenght - may be rotate the dip socket by 90 degrees and add a footprint for a compensation cap (NE5534 is not unity gain stable) while I am at it.... other single opamps might not require it, but then you can just leave it unpopulated.

- Michael

ForthMonkey · Apr 4, 2014

audiomixer said:
I think he wants to temporarily put DIP8 opamps into a EQ that takes DOA, until he has the DOA ready. besides output current limitations that need to be considered this can be done. so there is the space for the DOA anyway. but of course you could ask why not just build the DOAs early. sometime it's about checking basic operation or budget.....

I designed a dual footprint so that I can vary cost / performance in a test setup. quite a difference between NE5534 and a DOA....

I looked at your layout, did not find any obvious error, I would optimize the input traces for smallest lenght - may be rotate the dip socket by 90 degrees and add a footprint for a compensation cap (NE5534 is not unity gain stable) while I am at it.... other single opamps might not require it, but then you can just leave it unpopulated.

- Michael

Thanks.It's my first PCB design.I'm still trying to optimize it.I have some trouble actually...I will figure it out.

living sounds · Apr 4, 2014

iprovlek said:
I was tried this in my Soundcraft 200b!

Replace Tl071 with DOAs,and created some home made mini PCB for this aplication,but didnt work!

But I know what you trying to do!

But looked everywhere and never find DOA to DIP8!

Ill need this too ...

Cheers

Why didn't it work? I was planning to put Abe's DIP8 2520's in my console, but it seems he no longer sells them...

iprovlek · Apr 5, 2014

I was doing it with Neumann OA10 which are amazing but they do not have ground on PCB like gar 1731 or 2520!

So this was porbably a problem!

I manage to put transformers in my input modules in my Soundcraft 200b!1:2 trannies and works very fine....

I will try again cause i bought Gar1731 opamps they have ground and will maybe work in 200b!

Cheers

audiomixer · Apr 5, 2014

I don't think having or not having ground can be an issue, though you have to adjust your design according to your specific opamp. an opamp is not referenced to ground, but some DOA have onboard decoupling and do need a ground connection. of course some typical opamp topologies do have components connected to ground, like non inverting gain stages for example. before anybody chimes in because of ground / 0V / whatever you call it - just let it be, we all know we do not call it the same ;-)

changing an fet input TL071 to an DOA might have much more implication then just pinout....

- Michael

ForthMonkey · Apr 5, 2014

audiomixer said:
changing an fet input TL071 to an DOA might have much more implication then just pinout....

- Michael

Actually i used TL071 for designing.

I'm trying to use this circuits but i can't.I'm getting error when i try to simulate with 2520 asc and asy.

http://www.evolutionarytheory.com/downloads/LTSpice/

Kamel · Apr 6, 2014

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

ForthMonkey · Apr 6, 2014

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

??? But there lots of pcb like this.

Kamel · Apr 6, 2014

i know, i know

but if you need help, you're welcome

Spino · Apr 7, 2014

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

so, my mic cable is 15 meters long but a 4 cm pcb trace is no good. if it sounds like provocation, it is not, i'm really learning a lot here and i'd really like to know why!

thanks

sp

Kamel · Apr 7, 2014

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

ForthMonkey · Apr 7, 2014

:-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?

Dip8 2520 DOA

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