Re: [Homebrew_PCBs] liquid pencil
2011-07-27 by Charles R Patton
Years ago (maybe 40) I read about a technique that mentioned taking standard 2-part epoxy and loading it with graphite (the typical powered graphite for
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Re: [Homebrew_PCBs] liquid pencil
2011-07-27 by Donald H Locker
I used a mechanical pencil lead once as an electrode in an etching experiment; worked quite well, which is why I thought maybe one of these might. Oh well,
Re: [Homebrew_PCBs] liquid pencil
2011-07-27 by David Mitchell
Never mind. I tried it and the lines are not at all conductive. I ll try and think to check again in 24 hours after its cured or whatever. Actual pencil lines
Re: [Homebrew_PCBs] liquid pencil
2011-07-27 by Riley
looks like wallyworld has sharpie liquid pencil two-packs for $4 with free shipping or in stores. wouldn t it be a hoot if the graphite ink worked for
Re: [Homebrew_PCBs] liquid pencil
2011-07-27 by Donald H Locker
Thanks for the link; now to find a local retailer or such. Donald. -- *Plain Text* email -- it s an accessibility issue () no proprietary attachments; no html
Re: [Homebrew_PCBs] liquid pencil
2011-07-26 by David Mitchell
It s this one.. hmm.. refilllable.. http://www.sharpie.com/enUS/Pages/sharpie-liquid-pencil.aspx I found the refills.. 0.5mm
Re: [Homebrew_PCBs] liquid pencil
2011-07-26 by Donald H Locker
Who makes that product? 0.4mm is a little large for me (I prefer 0.18mm pens) but might be good for other experiments. As far as conductivity, I d say lay
liquid pencil
2011-07-26 by David Mitchell
I bought myself one of these new liquid pencils . It s like a retractable pen, but draws a nice thin (0.4mm or so) line with this liquid graphite ink. It
Re: [Homebrew_PCBs] Re: Ebay copper clad - experiences?
2011-07-26 by H. Carl Ott
... Seconded, been happily ordering from abcfab for years. Quality material, but the inventory selection does vary. -carl [Non-text portions of this message
Re: [Homebrew_PCBs] Re: Ebay copper clad - experiences?
2011-07-25 by kabowers@NorthState.net
... I got a bunch of 4 x6 SS boards from them a couple of weeks ago. In the past they had a good selection of carbide PC drills, but it seems to have shrunk
Re: Ebay copper clad - experiences?
2011-07-25 by freespamfree
You might want to try this website, Electronic Goldmine . I am looking into ordering from them
Re: [Homebrew_PCBs] Ebay copper clad - experiences?
2011-07-25 by Erik Knise
I ve also bought from amt33461. The boards were good quality and they were shipped very quickly. I really don t know how you can avoid the high shipping
Re: [Homebrew_PCBs] Ebay copper clad - experiences?
2011-07-25 by Piers Goodhew
Ahah. The simplified page works against him/them in searches. I should have pointed out that I m in Australia, so many sellers (including Baxter s NH one)
Re: [Homebrew_PCBs] Re: Ebay copper clad - experiences?
2011-07-25 by GoldenCircuits
Hi Everybody We are PCB manufacturer from China. We can offer you printed circuit boards. Please check our website: www.goldencircuits.com Alex
Re: Ebay copper clad - experiences?
2011-07-25 by bebx2000
I have ordered several times from abcfab on ebay, http://stores.ebay.com/PCB-Laminates-Copper-Clad?_trksid=p4340.l2563 He is located in New Hampshire and ships
Re: [Homebrew_PCBs] Ebay copper clad - experiences?
2011-07-24 by DJ Delorie
I buy from a seller named amt33461 here in the USA, he s been around for a while and always answers his emails. I don t think he has 1/2oz but he does have
Ebay copper clad - experiences?
2011-07-24 by Piers Goodhew
After 2.5 years on this list, I m coming close to using up my second single-sided 15x15cm FR4 blank. And while the prices at the local hobby electronics place
Re: [Homebrew_PCBs] Very fast etching 10 seconds!
2011-07-22 by Stefan Trethan
Well known already, and potentially very dangerous if large quantities of etchant are used. Definitely do that outside, lots of HCL fumes due to the exothermic
Very fast etching 10 seconds!
2011-07-22 by leeleduc
I ve been experimenting with etchants and have come up with a simple and fast one. 1 ounce Muriatic acid from the hardware store 1 ounce BAQUACIL Oxidizer from
New file uploaded to Homebrew_PCBs
2011-07-21 by Homebrew_PCBs@yahoogroups.com
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Homebrew_PCBs group. File :
Re: Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by designer_craig
You want as much RPM as you can get. But I found that if you are hand drilling its also important to find one that will stop quickly as it is much easier to
Re: [Homebrew_PCBs] Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by Kamal Shankar
Hi Pete, Why is Faster the better? I am new to terms like runout and can t understand why RPMs are important - is there a good guide that I can read/buy
Re: Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by bebx2000
I own both and am very satisfied with them. The drill stand has tapped holes to mount the KT70 X-Y table. Baxter
Re: [Homebrew_PCBs] Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by Jeff Heiss
Can you provide a picture of your stand? Jeff ... [Non-text portions of this message have been removed]
Re: [Homebrew_PCBs] Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by Stefan Trethan
The 12V Proxxon will be fine to drill PCBs, but it will begin to struggle for holes above 3mm diameter. If you drill many very large holes the IB/E is a better
Re: Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by pawel.labedz
Hi Proxxon is very good Im using proxxon model FBS240E (230V AC) and stand Proxxon 28606 MICROMOT Drill Stand MB 140/ S that was one of the best buy ever. This
Re: [Homebrew_PCBs] Re: Hydrogen peroxide mixing
2011-07-18 by Mark Lerman
I think you can get 35% peroxide online at ebay and some other sites. Apparently it is ingested for some health reasons (google food grade peroxide). See
Re: [Homebrew_PCBs] Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by Peter Loron
I dont have any specific feedback about those items except that I ve heard good things about Proxxon in general. Also, for carbide you want something with
Looking for feedback on (Proxxon) drill and press stand for DIY PCB
2011-07-18 by Kamal Shankar
How important is the RPM of the drill we use on a PCB? What would the difference be between a 1750 RPM vs a 10k RPM drill regarding drilling on a PCB? (I
Re: [Homebrew_PCBs] Re: Hydrogen peroxide mixing
2011-07-18 by Norm
Don t know about the ratios, but I think the H2O2 is 35 VOLUME , which is ~10%. Beauty shop suppliers will have 30 and 40 VOLUME, which correspond to ~9% and
Re: [Homebrew_PCBs] Re: Hydrogen peroxide mixing
2011-07-18 by Kamal Shankar
Thanks Ben. I read somewhere that the best mix for H2O2 + HCl is: 20% H2O2 at 35% 20% HCl at 32% 60% water to etch the copper. This needs to be done outside
Re: Hydrogen peroxide mixing
2011-07-18 by Ben L
... I normally use a air pump to pump air into the tank. Try a Beauty Supply for stronger than 3%. Ben
Re: Removing SMDs
2011-07-15 by Jan Vorlicek
If you want to scavenge components, the best way I ve found is to use 150W or stronger infrared bulb about a centimeter over the board. In less than a minute,
Re: [Homebrew_PCBs] Re: Plating rate
2011-07-15 by Donald H Locker
Thank you very much, TWB. That was the information I sought. Now, what to do with it? Donald. -- *Plain Text* email -- it s an accessibility issue () no
Re: [Homebrew_PCBs] TT and QFN
2011-07-15 by Piers Goodhew
Tks. I did print a 0.8mm TQF footprint and it didn t look so good vertically (not convinced OSX is actually sending 600dpi to my 16-year-old 5MP even though it
Re: [Homebrew_PCBs] TT and QFN
2011-07-14 by Stefan Trethan
I ve found QFN are easy to work with, even using TT. The fear of shorts below the part is mostly unfounded since solder is pushed out by surface tension (the
Re: [Homebrew_PCBs] TT and QFN
2011-07-14 by DJ Delorie
In theory, you should be able to do 0.5mm pitch QFN with TT - 0.25mm is about 10 mil, which is in range for TT, assuming your process is accurate enough.
Re: Plating rate
2011-07-14 by twb8899
The copper plating rate on my system was about .001 inches in 30 minutes at 30 amps per square foot of copper surface area. This was in a 500 gallon tank with
TT and QFN
2011-07-14 by Piers Goodhew
Just wondering whether anyone already has good/bad experiences doing this - a couple of parts I have my eye on are either only QFN or quite a bit cheaper that
Re: [Homebrew_PCBs] Re: Plating rate
2011-07-13 by Donald H Locker
Thanks, TWB. I was just wondering how long it took to add the additional 0.00007 inches of copper for the traces. I presume it is minutes to tens of minutes
Re: Plating rate
2011-07-13 by twb8899
I was in the PWB business for many years. Most jobs started with half ounce copper (.0007 ). After drilling and electroless processing the panel was laminated
Plating rate
2011-07-12 by Donald H Locker
I know that real circuit board houses don t etch away all the copper they don t want, I believe they plate up where the copper is desired over a very thin
Re: Hydrogen peroxide mixing
2011-07-12 by psykhon@yahoo.com
I suspect that a lot of the O3 will go trough the solution and end in the room, how would you control this? as far as I know, o3 in excess can cause cancer. O3
Re: [Homebrew_PCBs] Re: Hydrogen peroxide mixing
2011-07-11 by Kamal Shankar
Hi Darren, I am finding it difficult to obtain 3% H202 myself, and since the only purpose of H202 is to generate oxygen, I would very much like to
Re: Hydrogen peroxide mixing
2011-07-11 by Darren
I just joined this group, and haven t read through the messages, but I thought I would throw my .02 cents in on this one. As far as regenerating CuCl2 etchant,
Re: [Homebrew_PCBs] Re: Laser cutting for DIY PCB
2011-07-11 by Kamal Shankar
... Eric has been helping me out a lot recently, regarding the paint that works very well for him. We think it might be this, but he doesn t have the paint
more conductive ink news
2011-07-11 by David Mitchell
Another press release on conductive ink, this time it s RF energy scavenging using broad spectrum antennas printed on paper or polymer substrate, again using
Re: Laser cutting for DIY PCB
2011-07-11 by Stephen
Stephen Lane wrote: Yes it is hard to find a paint that evaporates cleanly, I haven t found one yet but I agree that good extraction or whats called air assist
RE: [Homebrew_PCBs] Re: Laser cutting for DIY PCB
2011-07-11 by Tony Smith
... There are other paint thinners beside acetone, could be turpentine, MEK, etc. Acetone should take the paint off, as usual it depends on the type of paint.
Re: [Homebrew_PCBs] Re: Laser cutting for DIY PCB
2011-07-10 by Kamal Shankar
Thanks Tony! For reference, this is the product page : http://www.laserbits.com/index.php?main_page=product_info&cPath=356_487&products_id=235 The video on