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2009-12-21 by Stefan Trethan
That, combined with your tools and skill. What s the recommended trace width: LARGE What s the recommended spacing: LARGE What s the recommended pad size:
2009-12-21 by blalor76
... Ok, so taking the etching method out of the equation, I still need to drill out the holes without ripping them up. Is that just a function of the size of
2009-12-21 by m10000_little_zip
Leon, thank you for the lead. A quick search looks like they are in the UK making for an unfavorable exchange rate for the etching kit. I have found a
2009-12-21 by leon Heller
... From: blalor76 To: Sent: Monday, December 21, 2009 12:31 PM Subject: [Homebrew_PCBs] Eagle design
2009-12-21 by blalor76
Morning, all. I m wondering if anyone has a set of design rules I could use with Eagle to help increase the likelihood of creating a layout that will work
2009-12-21 by leon Heller
... From: Roger Blair To: Sent: Monday, December 21, 2009 8:22 AM Subject: RE: [Homebrew_PCBs]
2009-12-21 by leon Heller
... From: m10000_little_zip To: Sent: Sunday, December 20, 2009 1:05 PM Subject:
2009-12-21 by Roger Blair
I m just setting up for Toner Transfer PCB fabrication. Your question has sparked my curiosity. I would like to learn what differences there are between
2009-12-21 by designer_craig
I am working on a project that needs a couple of bords. Can some one tell me the optimal temperature and concentration (g/l) for Ammonium Persulfate
2009-12-20 by m10000_little_zip
Hi, I m a new member to the group. This post may or may not be OT. I would like to get some parts made using the photo-etch process. I have gotten a quote
2009-12-19 by Simao Cardoso
... Replace the 11 in that url by 12 or start from 01 or click this for the all thing. http://www.precisioncircuits.com.au/pdf/cid_booklet.pdf But there
2009-12-18 by blue_eagle74
I etch my own boards. single and double. Not sure about the routing wires between pads, not much room at all or are you talking about traces (i hope)? I havent
2009-12-18 by DJ Delorie
... It depends on the chip and what you want to do with it. For example, I just did a layout (not etched) for a 6x8 (=48) BGA adapter that was single sided:
2009-12-18 by mcjonster
I have another question for BGA layout: Can I use a 2 sided board for a BGA and route wires between solder pads and put vias in there also or am I stuck with
2009-12-18 by blue_eagle74
I have done BGA s at work. I used a hot plate and a hot air gun. use flux and the solder on the part. Dont use any paste because it will make it ununiform,
2009-12-18 by Adam Seychell
... Thanks for the interesting link. I ve been looking for a good explanation of the various multilayer techniques but never found anything. My method is
2009-12-18 by Simao Cardoso
... Maybe i didn t explain with the right English words. Etchback is used to from etch resin sidewalls of holes in order exposing a copper anular ring of
2009-12-18 by Stefan Trethan
I ve hear the chinese ovens are no good (uneven heat). Better build a hotplate or something. I haven t tried BGA yet, but my plan would be pretty much the same
2009-12-17 by Harvey White
... There seems to be a conductive polymer that s available, but expensive. The wire glue I ve seen, but never experimented with. Interesting thought,
2009-12-17 by DJ Delorie
I did play with some CSP chips a while back to see if I could solder them with my hotplate, and it worked - although you have to be careful about lead-free
2009-12-17 by mcjonster
I want to use a Xilinx Spartan 3A XC3S200AN It comes in 256-FTBGA. I ve done .5mm pitch SMD parts with my hot air gun but never BGA. I understand I won t be
2009-12-17 by christiansen_alex@hotmail.com
I was reading a bit of the four layer debate...then... could a conductive glue be used to make the layer connection ? alex
2009-12-17 by DJ Delorie
... If your peroxide is twice as strong, and your acid half as strong, maybe you want half the peroxide and twice the acid? I.e. one part peroxide to two
2009-12-17 by sailingto
Here is the laminator for $35: http://salestores.com/tameri30.html NOTE: This is only a 4.7 max width. Ken
2009-12-17 by Howard
Hi Looking to go with this method! I have found some Hydrogen Peroxide that is 6% (20 vol), and some Hydrochloric acid which is only 16% (5ltr brick cleaner in
2009-12-17 by Adam Seychell
... I have no desmear removal step. Never had an inner layer electrical problem yet. I think because professionals use 100k+ RPM drill speeds there is much
2009-12-17 by Simao Cardoso
... (...) ... desmear or etchback bath. Are you using a etchback for multilayers or is possible to connect tracks in the inner layers without etchback the
2009-12-16 by Donald H Locker
Several (at least three) strands of very thin wire will wick much better than a single strand (which barely wicks at all.) Of course, one needs to make the
2009-12-16 by Harvey White
... Yep, not a good idea. Doesn t work. ... No plated through holes, you have a problem making connections. I ve used eyelets, but those get filled (and
2009-12-16 by DJ Delorie
... Having tried these, I can pretty much guarantee that the solder will *not* go down the hole, or into the pit, or whatnot. Way too much surface tension.
2009-12-16 by Harvey White
... Just solder making the connection between layers is not a good idea. If the connection is from a trace to a pit (what would be a blind via, not all the way
2009-12-16 by Brian Thorp
The big boys use some kind of through-hole plating... solder should work -----Original Message----- Date: Tuesday, December 15, 2009 11:26 pm To:
2009-12-16 by bebx2000
Although not a temp control circuit, the Tamerica-LP-120 is a reasonably cheap ($51) laminator with a variable temperature control that goes to 160 deg C. I
2009-12-16 by Piers Goodhew
Not that I have the remotest plan to make a 4-layer board, but with the epoxy sandwich method, how do you get any electrical connection between either side of
2009-12-16 by Adam Seychell
... Hi, I ve done a number of 4 layers, its very laborious (about 5 hours was my record time to make a 4 layer from printing the artwork to the final solder
2009-12-15 by DJ Delorie
... It s a pain, but this is what I do... Your stackup is: 32 mil DS clad for power/ground plane core . 8 mil SS clad for the two outer signal layers. Inner
2009-12-15 by DJ Delorie
... I also went with the acid-peroxide etchant, but after a few uses I realized the peroxide would degrade before I could convert the solution to a cupric
2009-12-15 by rmustakos
Once everything is lined up, put it in a strong trash bag and suck out the air with a vacuum. This may give you a few PSI of pressure, which, on a 12 inch
2009-12-15 by Googlemail
I have just set up a plating system so i have that covered. Trev ... [Non-text portions of this message have been removed]
2009-12-15 by Dave Sage
Making four layer boards sounds interesting but what do you do bout the plated through holes. I find even soldering double sided boards with no plated holes a
2009-12-15 by bobhuish2003
... I found this on the Web and tried it for this first time last week. It works GREAT!!!! Fast at room temp and cheap. Etchant: I ve found a new home-made
2009-12-15 by the nephilim
That s good to hear. It at least gives you time to think about and plan if you do go for a circuit type controller. I use semi-gloss photo paper myself it
2009-12-15 by Andrew Mathison
Hi Eduardo Perdomo your circuit is good, but for those who do not read Spanish too well, here is the new website (the old one does not exist anymore) for that
2009-12-15 by Howard Payne
Thanks to all that helped with this. What i did was get an old cloths iron and took out the thermostat and bolted it to the roller casing (same place where a
2009-12-14 by Eduardo Perdomo
See it : http://www.py2bbs.qsl.br/laminador.php ... De: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]Em nome de Howard Enviada em:
2009-12-14 by Lee Studley
I ve 3M spray adhesive, the I use several registration holes with needles poked through. As the sides come together you align them so the needles are are
2009-12-14 by Harvey White
... I haven t tried 4 layers, I ve done two layer boards. It s often quite nice to make each layer independently, then match them. Lots less stress when one
2009-12-14 by Trevor White
Well the epoxy idea seems to have legs. I am going to order some and give it a try. I was feeling quite down last week when I found out the prices of a press
2009-12-14 by Harvey White
... I have a board design with a MEGA2560 and an epson graphics driver chip, a 512K*8 RAM and assorted other parts. Does well on a double sided board. 4
2009-12-14 by chris
... I ve only done it once and I glued 2 double sided boards with epoxy, but added a sheet of fine fibreglass tissue between them also worked, but was fiddly