GE or BL[B] bulbs ? - was - Re: Photo-resist etching questions....
2007-05-24 by Andrew
... They show just below 400 as the best. This is closer to BL[B] bulbs (350 - 370nm) than GE/GT bulbs which put out UV-C at 250nm ... If you look on duponts
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Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-24 by lists
In article , ... I ve not used or looked into the properties of Ammonium persulphate but I have used Ferric Chloride and I d
new spray etcher
2007-05-24 by Adam Seychell
... Hi Tom, I ll be curious to know the concept of your new spray etcher. I too built a machine from scratch for a hobby project. You can see a short
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-24 by Adam Seychell
... But when I did, I would etch my ... I ve had the same experience, no sparks , boiling, or fizzing of any description when microwaving concentrated ferric
GE or BL[B] bulbs ? - was - Re: Photo-resist etching questions....
2007-05-24 by jpanhalt
... Do the datasheets really show 600nm is the best wavelength? What in the datasheet for the positive resist shows that longer wavelength UV will be more
GE or BL[B] bulbs ? - was - Re: Photo-resist etching questions....
2007-05-24 by pgdion1
I ve always used the black light bulbs (fluorescent, not the incandescent ones) and thought I was cheaping by but I read the same thing. The wavelength of
Re: TT Paper and release method
2007-05-24 by pgdion1
Thanks for the update, that s cool to know. I ve been having really good results with the Hammermill paper and the price is great (I don t even have to cuss
Re: [Homebrew_PCBs] Re: TT Paper and release method
2007-05-24 by Derryck Croker
... I first pass the TT paper through the laminator a couple of times to tack it into position, then heat with an iron (just rest the iron on top of a
Re: Mouthwash
2007-05-23 by juanabba
... . ... hi All Ted mention above that he uses a meat thermometer to measure the temperature. I need to do same on a fuser roll, in order to determine the
Re: TT Paper and release method
2007-05-23 by James Newton
... Preheat the board before laminating. They cool down very quickly so right out of preheat into the laminator with the pattern.
Re: TT Paper and release method
2007-05-22 by rdheiliger
... best ... very ... heat ... dial, ... small ... gone ... Remove ... sucks ... paper ... the ... never ... is ... 7310 ... This is an update on my previous
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-22 by Roland F. Harriston
Also consider the fact that the microwave oven cooking chamber if you want to call it that, is like a waveguide which has the magnetron sitting at one end.
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-22 by kevinmwolf@aol.com
BTw- Yes, it is one containing the activated charcoal filters. And I do appreciate that extra info. -k ... From: dale@chatham.org To:
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-21 by JanRwl@AOL.COM
In a message dated 5/21/2007 8:38:11 A.M. Central Daylight Time, ajsmith@rivernet.com.au writes: Heating is heating, whether it s in a microwave or in your
GE or BL[B] bulbs ? - was - Re: Photo-resist etching questions....
2007-05-21 by Andrew
... Data sheets for most of the positive resist I have seen would indicate that black light (long wave UV) bulbs are faster at exposing than germicidal bulbs
Re: Sharing my success and lessons learned
2007-05-21 by Ben
Manual / Dremel drill press. I do small boards 5x6 is the largest so far, and no more then 9 IC s. And with these old eyes that will be it. Thanks for the
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-21 by Dale Chatham
So much of this depends on the electronics in the microwave oven as well. Putting large pieces of metals in a microwave tends to create standing waves, which
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-21 by kevinmwolf@aol.com
Now- I thought I might share my insights on microwaving FeCl.. I no longer use FeCl for obvious reasons. But when I did, I would etch my boards in a shallow
Re: "Microwaving" Ferric Chloride
2007-05-21 by Steve
OK, everyone throttle it back a little. Steve Greenfield listowner
Re: Photo-resist etching questions....
2007-05-21 by Steve
... It s been many years since I ve made boards that way, but I didn t have any particular problems with spray on negative resist. BTW- black inkjet ink is not
RE: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-21 by Tony Smith
Oh, I think his comments were sincere, a little sarcastic perhaps. Unfortunately sarcasm tends to be lost on pedantic douches who post huge slabs of crap
Re: Photo-resist etching questions....
2007-05-21 by Richard
Chris, Laser-printer scaling problem: Edit the PDF file. The PDF is just a big text-file, and the scaling parameters are right there at the beginning. You
Re: [Homebrew_PCBs] Re: Sharing my success and lessons learned
2007-05-21 by Leslie Newell
Did you drill by hand or CNC? If you are drilling by hand the distortion isn t enough to notice. On, say a 40 pin DIL the error is small enough to be mistaken
Re: Sharing my success and lessons learned
2007-05-21 by Ben
I have used Staples Basic Photo paper and I did not encounter any problems of shrinkage/expanding. I did get some wavy lines, so now I only use straight down
Re: [Homebrew_PCBs] Sharing my success and lessons learned
2007-05-21 by kevinmwolf@aol.com
Curtis- Did you encounter any issues with the paper expanding/shrinking during transfer? I have never successfully completed a dbl-sided board due to this
Re: [Homebrew_PCBs] Re: Photo-resist etching questions....
2007-05-21 by Roland F. Harriston
I threw away my last sheets of Rubylith about five years ago. Time goes by. Roland F. Harriston *******************
Re: Photo-resist etching questions....
2007-05-21 by twb8899
Roland, Sounds like we both go back a bit in the industry. We used to do red-blue separations and pad masters. Everything was shot on a Brown 3000 horizontal
Re: [Homebrew_PCBs] Re: Photo-resist etching questions....
2007-05-21 by Roland F. Harriston
twb8899: I also remember cutting Rubylith , but I guess that sort of stuff is gone forever. Coordinatograph pops up in my memory. Roland F. Harriston
Re: Photo-resist etching questions....
2007-05-21 by twb8899
Roland, You re correct about using the methods I mentioned earlier for micro wave strip lines. I used to have a commercial shop and used much of the same
Re: [Homebrew_PCBs] Re: "Microwaving" Ferric Chloride
2007-05-21 by kevinmwolf@aol.com
Hey- Lets keep the attitude professional here. Incensere comments are unnecessary. Thanks and best regards, -Kevin Wolf ... From: metal@fullwave.com To:
Re: [Homebrew_PCBs] Photo-resist etching questions....
2007-05-20 by Roland F. Harriston
You are so right Leon! One trick is to purchase one of those great big aluminum stew pots like the professional chefs use. You mount your turntable or spinning
Re: [Homebrew_PCBs] Photo-resist etching questions....
2007-05-20 by Roland F. Harriston
One method that is worth trying when using spray-on resist is to use something like an old 78RPM photo turntable. You attach the PCB to the turntable with
Re: [Homebrew_PCBs] Photo-resist etching questions....
2007-05-20 by Leon
... From: lists To: Sent: Sunday, May 20, 2007 9:02 PM Subject: Re: [Homebrew_PCBs]
Re: [Homebrew_PCBs] Photo-resist etching questions....
2007-05-20 by lists
In article , ... If you re talking about spray on type stuff forget it. It s well nigh impossible to get an even coating of consistant
Re: Photo-resist etching questions....
2007-05-20 by lcdpublishing
The reason for the negative photoresist is cost. I can buy the photoresist in a spray-on bottle MUCH cheaper than I can find the positive resist. I can also
Re: [Homebrew_PCBs] Re: Photo-resist etching questions....
2007-05-20 by Roland F. Harriston
twb8899: Your technique is probably the most professional that I ve read about on this forum. Negative acting resist may have an edge over the positive
Re: Photo-resist etching questions....
2007-05-20 by twb8899
I use photo plotted film negatives with negative acting dry film photo resist. Expose with 1 kW mercury vapor bulb for 17 seconds. Etching is with ferric
TT Paper and release method
2007-05-20 by rdheiliger
I picked up some tips off Thomas Gootee s page and have done some experimenting. Below are some things I have come up with that make the process a bit easier.
Re: "Microwaving" Ferric Chloride
2007-05-20 by Richard
THANK you so much for that ENTIRE document; completely unedited....including all the useless/irrelevant disclaimers, etc, etc.. Next time, just post a link,
Re: [Homebrew_PCBs] Photo-resist etching questions....
2007-05-20 by Leon
... From: lcdpublishing To: Sent: Sunday, May 20, 2007 1:31 PM Subject: [Homebrew_PCBs]
Re: [Homebrew_PCBs] Re: Photo-resist etching questions....
2007-05-20 by Roland F. Harriston
I think that the best way to get really good negative or positive artwork is to use lithographic film. Using litho film entails more process steps i.e. camera
Re: [Homebrew_PCBs] Photo-resist etching questions....
2007-05-20 by John P. Anhalt
Hi Chris, I guess one question to ask is why you decided to go negative resist instead of positive resist? I have been using positive resist with pre-coated
Re: [Homebrew_PCBs] Re: Photo-resist etching questions....
2007-05-20 by Leslie Newell
It isn t actually a scaling issue. The problem is that the paper expands and contracts as it goes through a laser printer. This results in rather unpredictable
Re: Photo-resist etching questions....
2007-05-20 by pcb.easy
Snip ... Chris, I use the Positive Photo method. In the begining I was using over head transparencies and was having trouble obtaining a dark enough photo
Re: Photo-resist etching questions....
2007-05-20 by docstein99
... stable ... If you bave scaling issues - they will exist with a laser or inkjet printer. My inkjet printouts (using corel draw) are so precise, I can
Photo-resist etching questions....
2007-05-20 by lcdpublishing
Hi guys, I have almost given up on direct ink-jet resist and on plotting with Staedtler pens using the CNC machine, and I am about to abandon toner transfer.
Re: [Homebrew_PCBs] Heated etchant rocks!
2007-05-20 by DJ Delorie
Had to do more adapter boards, this time I timed the etch. The FeCl was up to temp (no delay this time), so it was about 115-120F. Single sided 1/2 oz
Getting started on surface mount
2007-05-19 by Gordon Couger
I have been away from actually building my own electronics for a pretty good while. I have designed a few simple broads with Eagle and prototyped a few boards
Re: [Homebrew_PCBs] "Microwaving" Ferric Chloride
2007-05-19 by Stefan Trethan
On Sat, 19 May 2007 17:45:08 +0200, Roland F. Harriston ... There is no real difference between heating FeCl in a microwave and with other means. The heat can
"Microwaving" Ferric Chloride
2007-05-19 by Roland F. Harriston
I really don t see a lot of cast-off microwave ovens in my neck of the woods. Not many junk shops here or thrift stores, etc. And I don t think I d want to