THAT compressor

[mkoz]

I don't think that you need to take the ground plane all around that much. It can cause more problems than good if you don't know what you are doing with it.

Mach

 

[audio2]

[quote author="Mendelt"][quote author="audio2"]
i guess im confused then. the schema shows the output of 2180 (pin8) going to the (-)pin on opamp 1. (+)pin to ground. It shows no power connection. Maybe you can help me understand this.[/quote]

Opamps have + and - signal inputs AND + and - power inputs. The power inputs are usually drawn on the top and the bottom of the opamp and are sometimes not shown. Opamps won't pass any signal when there's no power connection. That's why people take the power connection for granted and often leave it out to "simplify" the schematic.

If you see an opamp anywhere in a schematic without V+ and V- connected to anything you can assume they should be connected directly to the psu + and -. Sometimes people even leave out small capacitors to ground that should be added near the opamps to smooth the psu-lines.[/quote]

thanks. that helps. i wish i knew that. now i do. :grin:

 

[audio2]

[quote author="12afael"]on eagle you must use the invoke button over the op amp to see the power pins.[/quote]
where is the invoke button?

 

[12afael]

over the T buttor for text.

 

[audio2]

ok, hows this? still single sided, probably should have gotten rid of one of the opamps but im lazy and whats an extra $0.60. Probably need to be extra careful for solder splash on home projects.
anyways does it look correct?

 

[audio2]

[quote author="12afael"]over the T buttor for text.[/quote]
is that the ripup button? sorry.

 

[Handcrafted Tone]

The invoke button is in the schematic editor

 

[Handcrafted Tone]

Are you attempting a home etch, is that why you want it to be one sided? If so, I would use thicker traces, you will have fewer problems with the development process, especially when drilling holes. Also good to have plenty of isolation between traces.

As long as your DRC passes, it looks fine.

 

[audio2]

ya i made it for a home etch. thats why im trying to keep it single sided.
so thicker traces... ya i was thinking the isolation was a bit tight.

 

[audio2]

[quote author="Handcrafted Tone"]The invoke button is in the schematic editor[/quote]
oh ok cool.

 

[12afael]

remember this!

if you don´t use a op amp on a dual op amp IC is a good practice connect to ground the + input and connect the output to the - input.

and I can´t see the V+ on opa2 and V- on opa 3.

resistors and caps pads are a little small on eagle for my taste but AFAIK there is not way of make it bigger without make a custom library or make all pads biggers.

 

[Handcrafted Tone]

[quote author="12afael"]resistors and caps pads are a little small on eagle for my taste but AFAIK there is not way of make it bigger without make a custom library or make all pads biggers.[/quote]

yeah, thats why you use a big trace on a home etch, if you have a trace of 56mil, there should be plenty of "pad" regardless of what package you use.

You can use the DRC to change pad shape and pad diameter (sometimes) for the entire board.

 

[audio2]

thanks fellas for all the input and advice. I'll take it all into account and be posting my results here soon.

 

[audio2]

Roger thanks for the circuit. good to know.

 

[audio2]

yeah that will be something i will use for now on.

 

[audio2]

ok guys how does this look?
anything missed?

12afael- i did as suggested with the extra opamp on each 5532.

RogerFoote- i used your circuit in power section.

Crusty2- C4 is now after the resister.

my main concern is if i got r8,RT,r9,r10,r11 right.
and c4,CT.
according to the 2252 data sheet it says CT should connect to c4's ground end and a single trace should connect them to ground.
pots? are they correct?

 

[audio2]

anyone?
does it look correct or...
should i fix something?

i know removing the ground plane was mentioned but to be honest i dont think i could swindle that on a single sided board.

 

[12afael]

the 10ohm resistors of Roger schematic are good for the filter.

 

[audio2]

ok thanks guys. i'll work on those suggestions.

 

[audio2]

ok
100nf- check
ground, shorter path to 2252.- check

how is it now?

i noticed that i didnt even need that V+ trace that went along the top to the bottom right. So that makes gnd pin to 2252 much shorter, and i opened up some path for 0v around c4.