# I need Someone to help me Urgent in Designing The Layout for the PCB

#### khushal1988

Joined Nov 12, 2010
70
i have a circuit diagram and need some one to design the PCB layout for that so i could print out and make my circuit ready to present demo i am in urgent help please help me out i have just 1 day left and i designed once but failed to succeed please make the layout shall be very thankful. ... in the attachments 1 image is of circuit diagram and other picture is of components used in the circuit please help out.

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#### R!f@@

Joined Apr 2, 2009
9,749
No need to double post buddy...given the time difference...you have to wait around 24Hrs. for a workable reply

#### wayneh

Joined Sep 9, 2010
17,153
... i have just 1 day left and i designed once but failed to succeed ...
And what have you learned from that failure?

These things take time and attention to detail. First step is to get the dimensions of all the components and the hole placement required for the leads. Lay out the parts, keeping in mind the later connections. It's best to layout for minimum interconnections but it's faster - and easier to diagnose - to take more room and keep things "modular". Interconnects come last.

#### khushal1988

Joined Nov 12, 2010
70
i have short time left , and learnt many thing in the previous month by experimenting again and again but now i am in urgent need of layout to print and solder it tomorow cx monday is my demo of project need it to be in working condition please help me designig the layout.

#### SgtWookie

Joined Jul 17, 2007
22,221

#### beenthere

Joined Apr 20, 2004
15,819

I have used ExpressPCD for some time. The correct pattern for a TO-220 device is in the standard library of components. The one layout you have shown in the other thread might be good, but for the strange handling of the IRF540's where all the pads are shorted together.

Have you got the data sheet for the IRF540? Use the device designator as a search term to find one. The data sheet clearly shows the package details and the usage of each of the three pins.

In ExpressPCB, the correct pattern is "Semiconductor - TO220, without mounting hole (ie 7805 vreg". The heavy line parallel to the three pads is in the silkscreen layer. It is an indicator of the device's orientation - the metal tab should be on that side of the pads. With the orientation established, the pad functions are easy to relate to the data sheet.

#### Wendy

Joined Mar 24, 2008
22,472
I've drawn schematics and their PCB in Paint. If you don't have time to climb the learning curve before class there are other ways.

Sarge is right though, this site is meant to teach. This means we will explain how to do something, and give technical advice, but rarely do the work for you. The idea is you need to learn how to do it.

If you have a good hand you can hand draw the PCB yourself using a Sharpie (a brand of magic marker) and etchant.

#### tyblu

Joined Nov 29, 2010
199

i kid...

#### Kermit2

Joined Feb 5, 2010
4,162

THAT picture should be useable. If not I can upload the eagle file.

It's full of errors, so it won't make a gerber file or any other kind of file without lots of work that I'm not doing, but the graphics are loads better.

#### tyblu

Joined Nov 29, 2010
199
Why'd you do it CNC-style? Is that what you use to prototype?

#### Kermit2

Joined Feb 5, 2010
4,162
@kermit2

You are very good at that. Can I trouble you with something similar...I might make it worth ur while
I'm a slow witted, idiot savant. Sure! I'll help!

Now that it has been offered so quickly, decide if you REALLY want that help.

(Cue Final Jeopardy Theme music)

#### Kermit2

Joined Feb 5, 2010
4,162

Pretty much. don't have any place to do the chemical etch.

And it's not CNC right now. Just MeNC.

TYBLU : Your question was supposed to be in quotes right here. Just use your imagination everyone!

#### R!f@@

Joined Apr 2, 2009
9,749
I like you..u'r my kinda guy....

Sorry if it disappointing u but what I have is rather small.
The thing is that I can draw a schema but when it comes to actually transferring it a PCB, I kinda get the hiccups..maybe because I never tried it. I would love to learn but as of now I just can't seem to get the time to study...too much work and family errands

What I have is something like 2" by 2" PCB. It's for an Amplifier that our famous wannabe's here tried to fix. After years of repairing (trying to) it ended up with missing parts and components . Since I am the Audio guy around here, I get all the hopeless customers. This is really the story of my life. It's a vintage piece and my customer actually loves it so much tht he begged me to make it for him.

I think I'll once again entertain the good folks of AAC with one of true story that is intertwined with this PCB job.
Since you so humbly agreed to do this for me,I think it is only fair for me to tell u, once again, the good old electronic tech stories of the that guy who lives in no where land.

I'll let you know once I open a thread for this, no need to hijack OP's thread. Right?

#### Kermit2

Joined Feb 5, 2010
4,162
I say hijack away. The 'job' is done. Balls in his court. I'm out of witty sayings.

To the OP. Good luck with it. It's my first community service board.

#### R!f@@

Joined Apr 2, 2009
9,749
Naaaah!! .. we'll start fresh. it will be quite interesting.

#### jpanhalt

Joined Jan 18, 2008
11,088
@Kermit
When you machine it, do you do it to dimension or do you print the pattern on the copper and follow that? That would be a lot of turn counting to do it by dimensions only.

edit: Based on the related threads, this project is due sometime around 10AM EST (1500 GMT) today.

John