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Index > Projects and Ideas > For Engineering Enthusiasts|How to make a PCB

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typedef



Joined: 25 Jul 2010
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typedef
Post 21 Apr 2011, 05:42
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
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revolution
Yeah, good idea. I've made many small prototype boards this way.

Double sided boards can be very tricky though. You have no through-plating so you have to solder pins on both sides. Vias need to have some wire placed through the hole and soldered both sides.

After tested and working you should thoroughly clean away all flux and lacquer everything to prevent the copper corroding.
Post 21 Apr 2011, 09:46
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Artlav



Joined: 23 Dec 2004
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Artlav
Without special materials? What do you call all this stuff then?
Post 21 Apr 2011, 15:02
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roboman



Joined: 03 Dec 2006
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Location: USA
roboman
You could go real old school and draw the traces with a pen Smile The last couple of pcb's I did with a cnc mill, just cut off the copper that you don't want....
Post 22 Apr 2011, 01:16
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typedef



Joined: 25 Jul 2010
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typedef
roboman wrote:
You could go real old school and draw the traces with a pen Smile The last couple of pcb's I did with a cnc mill, just cut off the copper that you don't want....


Can I see you guys' pictures of your PCBs, if you still have them. Very Happy
Post 22 Apr 2011, 01:19
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roboman



Joined: 03 Dec 2006
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Location: USA
roboman
I'm not sure I still had any hand drawn stuff. Been doing a major clean out of old junk and last week end nearly all my old electronics stuff went to e-waste or the free section of crags list. They looked like a 5 year old's line drawings. The milled out stuff, check out http://www.pcbgcode.org/
Post 22 Apr 2011, 13:27
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JohnFound



Joined: 16 Jun 2003
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JohnFound
typedef wrote:
Can I see you guys' pictures of your PCBs, if you still have them. Very Happy


Here is one, made in 1996 by drawing the tracks with home made ink (bitumen solved in turpentine), home made pen (from insulin syringe needle cut to 5 mm) and etched in hydrochloric acid and hydrogen peroxide solution.

It is fast ADC module, with it's own memory buffer (256kx12bit DRAM).


Description:
Filesize: 119.51 KB
Viewed: 12371 Time(s)

DSCN3824.JPG


Post 22 Apr 2011, 14:14
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Artlav



Joined: 23 Dec 2004
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Location: Moscow, Russia
Artlav
For quick prototyping i prefer simple 3D soldering - no fussing, no layouting.
Image

For something more permanent dot boards are quite good, and more dense than free hanging:
Image

Why go all the trouble making a PCB for a simple circuit, no idea.
And i never made anything complex enough to warrant one.
Post 22 Apr 2011, 15:42
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typedef



Joined: 25 Jul 2010
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typedef
wow those are really cool.

i just need to learn how to map the modules.

does yours have a clock chip?

and @JohnFound how did you make your own memory buffer?


Last edited by typedef on 18 Jun 2011, 02:07; edited 1 time in total
Post 22 Apr 2011, 22:34
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JohnFound



Joined: 16 Jun 2003
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JohnFound
typedef wrote:
and @JohnFound if i how did you make your own memory buffer?


Using 12 DRAM chips of course - 41256 if I remember correctly. It is the cube in the center.
Post 23 Apr 2011, 06:12
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Madis731



Joined: 25 Sep 2003
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Madis731
@Artlav: Your 3D soldering is scary Very Happy but I guess its effective
Post 25 Apr 2011, 13:52
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bitRAKE



Joined: 21 Jul 2003
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bitRAKE
I haven't tried it, but I guess SMD parts could also me soldered together in a lump (ie without board). I've build a circuit on a copper penny (heatsink, lol).
Post 26 Apr 2011, 01:40
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Octavio



Joined: 21 Jun 2003
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Octavio
revolution wrote:


After tested and working you should thoroughly clean away all flux to prevent the copper corroding.

I think you are using the wrong type of flux.A flux made with a alcohol + rosin no needs to be cleaned and also protects the circuit.
For making pcbs i like more to use a photosensible board it is not more difficult but is more precise and accurate,in the photo (usb audio device) some wires are 0.2mm with 0.2mm spacing .


Description:
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IMGP0961.JPG


Post 17 Jun 2011, 10:59
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Enko



Joined: 03 Apr 2007
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Location: Mar del Plata
Enko
the little square resistors are better soldered using a hot air gun. You just put some soldering paste on the board, hot air... 2-3 min and they soldered. And it can be done soldering a bunch together.
Post 17 Jun 2011, 13:16
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17247
Location: In your JS exploiting you and your system
revolution
Rollerball-pen ink to draw circuits on ordinary paper

Although they don't say how successful it is (or not) soldering the components with a paper substrate.
Post 28 Jun 2011, 16:40
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Artlav



Joined: 23 Dec 2004
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Location: Moscow, Russia
Artlav
What about homemade lithography?

http://colossus.cs.rpi.edu/~azonenberg/papers/litho1.pdf

Image

15um for sure, 2um potentiallly.
Could be fun.
Post 28 Jun 2011, 17:05
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