RE: [Homebrew_PCBs] Laminator
2013-10-04 by Fadi Kahhaleh
Hi Jack, I had good luck with purple cows laminator sold at Costco. However it takes several passes to get food results and I find it doesn t apply a lot of
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RE: Laminator
2013-10-04 by <salomon.777@...>
I ve just bought a fellowes Venus 125 laminator, I ve tried to use it without modding it but I think the temperature does not get over 130 C (265 F) so it does
RE: UVA Dosimeter – interest check and ideas
2013-10-03 by <cs6061@...>
A calibrated UV light meter would be an interesting tool to verify you exposure box has consistent light across the surface and possibly to adjust the exposure
Laminator
2013-10-03 by Jack Schmidling
Is there a preferred laminator for PCB making? I have been at this for a few weeks and have tried many of the suggested media and a few of my own. So far the
Re: UVA Dosimeter â interest check and ideas
2013-10-03 by AlienRelics
Discussions of the need for a UVA Dosimeter are on topic. Discussion of the design are not. Electronics_101 is an excellent place for that.
UVA Dosimeter – interest check and ideas
2013-10-03 by william casselberry
If design and code was available, would you build one? What features should it have? Uses * Check your safe light * Check your light box * Check your
File - monthly.txt
2013-10-01 by Homebrew_PCBs@yahoogroups.com
Monthly Reminder for Homebrew_PCBs list, please read: Messages and threads: Please do NOT start a new thread by replying to another message. Even if you change
Re: Expo Drill Stand 14211
2013-09-29 by Jim
... Just to add to this discussion: http://www.flickr.com/photos/wb8nbs/9187175381/ I got this small cast iron drill press at a flea market. Added the stand
Tinning With Solder Paste and Flux Gel
2013-09-29 by James
I ve always found tinning to be one of those things I could never get the hang of the traditional way using solderwick. Today I tried something which
Re: [Homebrew_PCBs] RE: Expo Drill Stand 14211
2013-09-28 by John
That s the one I bought 26711. Small but takes my Expo mini drill. With the three shafts run out is minimal, fine for my needs. John From: arvidj@visi.com
RE: Expo Drill Stand 14211
2013-09-28 by <arvidj@...>
As a follow up to this thread ... I ordered the Jameco Drill Stand Works with Mini Drill (Part 26702) ...
RE: Re: [Homebrew_PCBs] RE: RE: RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-25 by <roland.rasch@...>
These are called shoulder protection or sidewall protection chemical additives an are still in use but the composition is usually proprietary. Found a
Archiving Yahoo Groups messages; Neo prevents this
2013-09-25 by Robin Whittle
It may still be possible for some people to use their Yahoo Groups account and special software in order to archive all the messages of a Yahoo Group as well
Re: [Homebrew_PCBs] RE: Diaphragm and peristaltic pumps
2013-09-25 by David Pickering
Thanks Andrew Just ordered one from your last entry for just over £6, cant go wrong at that price. Going to mod a manual pump chamber will let you know
Re: [Homebrew_PCBs] Re: Tin Plating
2013-09-25 by David Pickering
I gave up on all that now because it doesnt warrent the time and exspense involved with DIY PCBs The best cheapest and most effective way to protect circuit
Re: [Homebrew_PCBs] RE: RE: RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-25 by <n0tt1@...>
Just for discussion here.... I gotta ask about using oil (or whatever) with etchant. Let s say that it DOES prevent undercut...what would be the chemical
RE: RE: [Homebrew_PCBs] RE: RE: RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-25 by <andrewm1973@...>
A flojet not a shureflow according to Mr Seychell http://groups.yahoo.com/neo/groups/Homebrew_PCBs/conversations/topics/8414 ---In
RE: [Homebrew_PCBs] RE: RE: RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-25 by Andrew Volk
Andrew- I’m not in Australia (in US), but what kind of pumps are you talking about for pumping etchants? From: Homebrew_PCBs@yahoogroups.com
RE: RE: RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-25 by <andrewm1973@...>
Rotary one for an area 1/4 of an A4 sheet of paper should be able to be cobbled together for much less than $100. If you want to go for something more like a
RE: RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-23 by <roland.rasch@...>
Thanks very much for the Info! A rotary type would also be cheaper to realize, so If I get to build one then I will probably go for a rotary tube one. Toner
RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-23 by <andrewm1973@...>
Spray etchers (using diaphram pumps) I have seen have droplets not mist. The point of the droplets is to have some weight behind the impact to move the
Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-23 by rolynd33
over here is germany...sry. There are some commercial suppliers for acid resistant pumps but they are not cheap, quite the opposite. By spray I mean finely
RE: Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-23 by <andrewm1973@...>
finding the right pumps over here without having to spend a fortune Where is Over here There are the rotary tube thingies but thats
Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-23 by rolynd33
I have considerer the use of a spray etcher, would be nice to be able to make some double sided etching/cutouts but thats still on the design board. Problem
RE: Some etched Artwork finished and questions on electrolytic etching
2013-09-22 by <andrewm1973@...>
Rolynd, Have you considered a spray etcher? Instead of being 1hr with ferric it would be more like 10mins for that depth shown in the photo. I know it s not an
RE: DIY Soldermask
2013-09-22 by <bobledoux@...>
What about spray shellac? Alcohol is the solvent. --- In homebrew_pcbs@yahoogroups.com, wrote: The method described in the link is for conformal
Re: DIY Soldermask
2013-09-22 by Bip's
The method described in the link is for conformal coating, not as a solder mask substitute. To protect against corrosion, first clean the board thoroughly with
Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-22 by AlienRelics
Beautiful work! As others pointed out, the failures can be viewed as pre-aged successes. Have you checked the database here? There is an editable database
Re: Touch off plate Z height compensation
2013-09-22 by Paul Alciatore
I am not completely sure as to what your problem is, but the following assumes that you are milling PCBs. But perhaps you are talking about general milling
Re: Some etched Artwork finished and questions on electrolytic etching
2013-09-22 by rolynd33
I use Icewater. No problems with the transfer, no pinholes etc. When I am using ferric everything works fine I only get problems when I tried electrolytic
Re: [Homebrew_PCBs] Some etched Artwork finished and questions on electrolytic etching
2013-09-22 by Malcolm Parker-Lisberg
Did you freeze the paper after thermal transfer, or just soak in water. Freezing for 20 mins. to 1/2 hour gives a denser transfer and easier paper removal.
Some etched Artwork finished and questions on electrolytic etching
2013-09-22 by rolynd33
I recently finished some etched Pendants. You can see sone photos here: http://brassgoggles.co.uk/forum/index.php/topic,41175.0.html I used the toner Transfer
RE: DIY Soldermask
2013-09-21 by <twgray2007@...>
Don t mistake this for soldermask. It will protect the traces and solderpoints from corrosion and moisture, after all the soldering is completed, but it will
DIY Soldermask
2013-09-21 by <bebx2000@...>
Interesting DIY PCB protection/soldermask featured on Hack a Day, http://www.digitalunderpants.com/polyurethane-for-protecting-one-off-pcbs/
Touch off plate Z height compensation
2013-09-21 by <kf7ycz@...>
Hello and good day all. My name is Silas, and I am trying to figure out how to get the correct Z axis compensation for non-conductive surfaces. I have
Re: [Homebrew_PCBs] RE: Diaphragm and peristaltic pumps
2013-09-20 by Todd F. Carney / K7TFC
Go to Instructables and search for vacuum pumps. There s a lot of projects for various type of pumps, including a reversible tire-pump like piston pump, and
RE: Diaphragm and peristaltic pumps
2013-09-20 by <andrewm1973@...>
bought one of his $17 vacuum pumps to make a new frame a while ago. Looks the part but have not used it in anger yet --- In Homebrew_PCBs@yahoogroups.com,
RE: Measured light reception from 10W LED according to distance from centre
2013-09-20 by <wcasse@...>
I like this idea of using a UV sensor - but this is a DIY group, so surely we can design and make something more purpose specific than the devices available on
Diaphragm and peristaltic pumps
2013-09-20 by Robin Whittle
If anyone is looking for diaphragm pumps, such as for vacuum hold-down of flexible PVC sheet to press a phototool to a PCB for UV exposure, or maybe for
Re: [Homebrew_PCBs] Measured light reception from 10W LED according to distance from centre
2013-09-19 by Slavko Kocjancic
If that 62ms is true then I see a big GO for this project... Just waiting for led to make real test. And probably then I will hit the problem of focusing. The
Re: [Homebrew_PCBs] Measured light reception from 10W LED according to distance from centre
2013-09-19 by Corey Minion
Your intensity would increase if you measure up, light falls off regardless of band over distance travelled. The amount of light falling on a surface is the
Re: [Homebrew_PCBs] Measured light reception from 10W LED according to distance from centre
2013-09-19 by Robin Whittle
Hi Slavko, ... The area covered by the ligh is 1 / (34 x 34) of whatever it is at cm so the time scales in the same way. My exposure tests were at 30cm and I
Re: [Homebrew_PCBs] Measured light reception from 10W LED according to distance from centre
2013-09-19 by Russell Shaw
... ... Using this UV light meter, i found my pcb exposure box (75W mercury UV globe) gave 0.13mW/cm^2 at 60cm distance from the globe (it has a large
Re: [Homebrew_PCBs] Measured light reception from 10W LED according to distance from centre
2013-09-19 by Slavko Kocjancic
Hello... Robin can you test what time takes if the led is just 1 cm above (instead 34) board? I know the area will be small but I m just interested how big
Re: [Homebrew_PCBs] Re: Imaging PCB with LED
2013-09-19 by Slavko Kocjancic
I know that this can (will) be problematic. As angle of led is around 120 degrees it s unusable as is. If I make aperture of 0.2mm at the led then beam 1mm far
Measured light reception from 10W LED according to distance from centre
2013-09-19 by Robin Whittle
With the 10W UV LED I described in recent messages, I measured the amount of light falling on a flat surface, like the PCB, according to how far from the
Re: Tin Plating
2013-09-18 by designer_craig
I have used the Sulfamic acid, Thiourea, and stannous chloride since 1973 to tin plate boards. If you are having problems, make sure your chemicals he correct
Re: Imaging PCB with LED
2013-09-18 by designer_craig
The problem with the LED is the light is pattern is most likely 110 to 140 degree. Even if you had a 20X objective lens below your aperture mask the mask hole
Re: [Homebrew_PCBs] 10W ~380nm UV LED for exposing Riston & other negative film photoresists - actually ~394nm?
2013-09-18 by Slavko Kocjancic
I had ordered http://www.ebay.com/itm/221248115201?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 and this should match my photoresist. They are marked as
RE: Tin Plating
2013-09-18 by <fred27murphy@...>
Has anyone used plating pens? I ve found discussions about using them for silver plating. Not sure if it s possible with tin. Some links (you can tell I m UK