The Shop > Electronics & IC Programing

How do you do your PCBs?

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PekkaNF:

--- Quote from: CrazyModder on January 20, 2016, 01:41:40 AM ---Sure. In Germany people  traditionally use pages out of the printed catalogue of one of the big electronics shops, for whatever reason that seems to work best (or it is simply because people who do things like this have this kind of catalogue lying around :) ).
--- End quote ---
Incidentally I think I have the right catalog to the job, starts with little blue "r"?

Do people soak it long or use other deucedly clever method?


--- Quote ---I have one of those old sunlights (I think it is a "Philips HB 171/A" or similar to it) and just prop it up on something when I need it, I didn't feel the need for a proper box yet.

--- End quote ---

I have bunch of T5 small tubes, 20 cm long or so... Really would like to build a small enclosure a) To keep it safe between uses b) to make it as small as possible. I have way too much trash, treasures, thrashures.

Pekka

awemawson:
When we were kids just after the war, Sunray lamp treatment was all the rage for pale under nourished children. We had a lethal lamp with a Mercury discharge tube shaped like a horse shoe, little red button on the back to press to start the discharge.

It stayed in a cupboard for years until I needed a uv source for exposing PCB art work. Only took seconds !

Now I have a proper Mega exposure unit with built in timer.

geoff_s:
Unless it's a really simple, single sided design, I send the gerbers off to somewhere like Seeed and get them made.
Simple designs I route out on the CNC.

tom osselton:
I have a flip top plate maker for printing presses it has a carbon arc with timer and vacum do you think this would work on the photopolymer paper?

PK:

--- Quote from: awemawson on January 19, 2016, 03:32:03 PM ---Made by Mega, it has a developer tank, etch tank and tin plating tank, with water rinsing slots in between making it all very convenient - has a handy sink built in as well.

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We had one of those units for many years. We used Ferric Chloride etchant and ours didn't look much like that picture when we finally sold it. Before that we had one we made from glass. Before that we used one we built from PVC Sheet. Before that we had a little hobby one.....You get the idea..buy decent tanks ..

Our process was:
Inkjet print onto transparency (inkjets have better resolution)
Lay the top and bottom transparencies on piece of paper and align them, hold in place with tape.
Put double sided Kinsten board in and expose both sides in our DIY exposure box.
Etch,
CNC drill.

A word of caution. Making a double sided exposure box is a good idea. Making one with short wavelength tubes is VERY DUMB!  The lighting supplier sold me UV tubes used to sterilise water. Hand on my heart those lights were on for less than 5 seconds and I spent the nigh in emergency with sunburned corneas. I never knew my eyeballs could hurt that much!

The advent of the US$1 per board prototyping services out of china mean that we no longer do in house boards... It's just not worth it...

PK

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