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Homebrew PCBs

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Re: UV LED Exposure unit

2009-06-15 by Daniel Howard Bryant

I ve tossed around the idea of a UV LED exposure unit, but instead of using a dedicated constant current IC I was thinking about using voltage regulators set

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UV LED Exposure unit

2009-06-14 by javaguy11111

After about a years delay I am back to working on my UV LED exposure box. I finally got my LED panels soldered and was getting ready to order parts for the

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Re: ExpressPCB software mirror image?

2009-06-14 by a3v03v0

Richard, I can tell you it works because I am doing it with a HP1020 laser printer and a MAXNC-10 mill. I use Eagle to layout the PCB. There is a ULP called

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Re: ExpressPCB software mirror image?

2009-06-14 by RICHARD HEILIGER

Both DipTrace and Eagle do mirror images. DipTrace does it in the preview window, where you can turn on or off whatever layers you wish, and mirror image any

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Re:undercutting

2009-06-14 by Lee Studley

Thanks for sharing the results! Could you put some pictures up if you have time? I d like to see the undercutting and the board. I have a Solid wax Ink

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Re: Silk screening solder resist

2009-06-14 by a3v03v0

Various acrylic sprays can be used to provide color and protection. I use a clear acrylic and others have used Testors semi transparent acrylic paint to fake

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Re: Silk screening solder resist

2009-06-14 by a3v03v0

It is a nice setup in that you have everything needed for silk screening in one compact unit. The main issue with making PCBs via silk screening is alignment.

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Silk screening solder resist

2009-06-14 by mycroft2152

There is a new silk screening kit for crafters and soccer moms called the Yudu. At $299 it is a bit expensive. It looks like a real no brainer. It uses a photo

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undercutting

2009-06-14 by DJ Delorie

Etched another board tonight, this is a 4 layer 6/6 board. After etching, I noticed that the copper was undercut about a mil or so. Since the 0.5oz copper is

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Re: [Homebrew_PCBs] Re: THP

2009-06-14 by Simao Cardoso

On Sat, 2009-06-13 at 16:40 +0200, nisma@gmx.net wrote: I think is PTH and not THP :) ... Great, so any of the chemistries pyrrol based I read about have

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Re: THP

2009-06-13 by scx31114

Polypyrrol is the correct agent, pyrrol is only the chemical source for building polypyrrol

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Re: THP

2009-06-13 by nisma@gmx.net

Hi, i have written a long reply on the group webpage, but because tecnical reason, no delivery was possible, so here a short reply. I have experimented with

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Re: photo paper on sale at Staples

2009-06-13 by RICHARD HEILIGER

I bought a pack of the Staples photo paper a couple years ago, at the recommendation on another page. It is very heavy and will not work in laminators. It does

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Re: ExpressPCB software mirror image?

2009-06-13 by RICHARD HEILIGER

I have tried moving the graphic images from the express pcb program into several other graphic programs. The scaling seems to be different between them and I

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Re: photo paper on sale at Staples

2009-06-13 by Daniel Howard Bryant

I ve just made my first toner transfer image using the Staples paper(I used to make PCB s using the photo-method, but don t have the space in my current

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Re: trougth hole processing chambers.

2009-06-12 by scx31114

... Yes, the connection is to made at the two opposite wires ends. There is a plastic rod, with the heating wire wrapped around. Apply tension to the wire

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Re: photo paper on sale at Staples

2009-06-11 by sailingto

OK, someone answer the man s question - is the the famous Staples paper that works so good for toner transfer? At least someone needs to buy a pack and try so

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photo paper on sale at Staples

2009-06-10 by John Shadle

I believe this is what some folks use for photo resist etching, no? http://projects.newsobserver.com/taking_stock/1_photo_paper_at_staples FYI. -john W4PAH

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trougth hole processing chambers.

2009-06-10 by nisma@gmx.net

Hi, i´m building a new pcb plating process line from plain PP sheets and http://www.orbi-tech.de/seiten_englisch/heating_welding_rod.htm . This permit

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Re: DIY conductive vias ?

2009-06-10 by Daniel Howard Bryant

... Maybe and maybe not, I ve used a toaster oven to do reflow on TQFP packages and haven t had any trouble. (I got a toaster oven at a local thrift store for

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Re: DIY conductive vias ?

2009-06-09 by a3v03v0

Plugging holes is an add on to plated through holes. As far as I know all commercial processes seed and plate holes. I do toner transfer. apply solder paste

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