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Topic: Homemade pcb with Photoresist method (Read 4037 times) previous topic - next topic

aster94

Hello,

Since in this forum we are almost all hobbyist i thought to write  here

I get bored of paper transfer method and time lost so i wanted to switch to the photoresist.
About the spray a lot of people use the positiv-20, it s 15 euros in europe, someone knows any alternative?
And for the transparent paper which one do you use? I don t want to buy the cheapest and then trough it

Any link or suggestion would be very appreciared  :)

larryd

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CrossRoads

Salt, vinegar, hyrdogen peroxide seems viable also
https://www.google.com/?gws_rd=ssl#q=hydrogen+peroxide+vinegar+salt+pcb

I send out for all my boards,  I won't give up plated thru holes, stenciling, solder mask.  And not having to not drill holes.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Wawa

Once you have used a board house, you never go back to making your own.
Leo..

aster94

Really i asked a suggestion about which photoresist spray and  transparent paper I should use... I never mentioned the etchant solution or how to do it

Wawa i agree, but what do you do when you need only 1 board?

Wawa

Wawa i agree, but what do you do when you need only 1 board?
I use my $3,000 CNC machine for that.
Leo..

GypsumFantastic

I use tracing paper in a laser printer. I think it takes the toner a bit better than the acetate sheets some people use. I've had some really crisp results.

I buy pre-sensitised boards though, so I'm afraid I can't offer any advice with the spray stuff.

I like doing it myself. I enjoy the process.

aster94

I use my $3,000 CNC machine for that.
Leo..
You like to play the easy games ahahah one day i will have a cnc but this is not the day

I use tracing paper in a laser printer. I think it takes the toner a bit better than the acetate sheets some people use. I've had some really crisp results.

I buy pre-sensitised boards though, so I'm afraid I can't offer any advice with the spray stuff.

I like doing it myself. I enjoy the process.
Could you give me a link or only the brand of this tracing paper?

MarkDerbyshire

#8
May 16, 2017, 11:05 am Last Edit: May 16, 2017, 11:20 am by MarkDerbyshire
To make the mask I use JetStar for Inkjets.  


Inkjet/laser pcb film

They also do one for laser printers.  It is easier and better results to by the pre sensitized boards and I expose in a UV box from ebay.

ElCaron

Wawa i agree, but what do you do when you need only 1 board?
Throw away the other 9 boards? Seeed just reduced their price to 5$ for 10 10x10cm^2 boards.
The only reason not to do that is the three weeks shipping time.

Wawa

Some board houses have 5 boards for the same price as 10.
But this could reduce freight cost (which is the biggest killer).
Shop around.
Leo..

aster94

Throw away the other 9 boards? Seeed just reduced their price to 5$ for 10 10x10cm^2 boards.
The only reason not to do that is the three weeks shipping time.
yep plus the 13€ for shipping, maybe in your country it is cheaper

GypsumFantastic

Could you give me a link or only the brand of this tracing paper?
It's Gateway brand but I don't think there's anything special about it. It was the first one I found in the stationery catalogue we use at work.

It's 90gsm which is just a bit thicker than standard copy/laser paper - I think that makes it a bit easier to handle.

This is the stuff.

I made my own exposure box using a UV CFL tube from a pond steriliser. It takes a long time to expose (about 15 minutes) but as I said, the results have been good.

allanhurst

Quote
I use my $3,000 CNC machine for that.
Leo..
Well, it's ok for some, but I bet you can' t do 4 thou track and spacing and 10 thou vias....
And how do you register top and bottom layers?

And as for mutilayers - that's tricky.

I've etched my own in the past, but professionally made boards are so good and cheap I woudn't bother these days.

And maybe the slow boat is partially a good thing - it makes you check thoroughly before ordering..

Allan

Boardburner2

I would second the use of pre sensitised boards.

The spray on stuff i found to be finnicy, and have not used it for 30 years or so.

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