Re: [Homebrew_PCBs] Re: ground planes
2012-03-16 by Harvey White
... polygon, properties, uncheck solid fill, then the parameter for the pattern is effective (it s not isolation). Harvey
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Re: [Homebrew_PCBs] Re: ground planes
2012-03-16 by Harvey White
... if a laser produces the pattern, yes. If an inkjet, no. ... Nope, charge tends to congregate at the edges of any pattern. A large black area will be
Re: [Homebrew_PCBs] Re: Cheap copper clad boards
2012-03-16 by Spencer W
It s a surplus store in minnesota. http://ax-man.com/ Sent from my iPhone ... [Non-text portions of this message have been removed]
Re: ground planes
2012-03-16 by sailingto
If Eagle has this option, I ve not found it yet - doesn t mean it doesn t have it. Ken H
Re: ground planes
2012-03-16 by sailingto
I sure hope so. I ve tried it a bit and it does help, but only had enough for the one time. I ve just got an order of the 8 X15ft roll - I ll be testing it
RE: [Homebrew_PCBs] Re: Cheap copper clad boards
2012-03-16 by Jeff Heiss
What is Ax-Men? ... able to find A LOT OF single side 36 x 42 thin copper clad boards for $7.50. ... [Non-text portions of this message have been removed]
Re: ground planes
2012-03-15 by tda7000
... I thought the Green TRF from Pulsar is designed to fix this exact problem?
Re: [Homebrew_PCBs] Re: ground planes
2012-03-15 by Leon Heller
... It will have if you use a laser printer to create the transparencies. You must use an inkjet printer. ... It s more a cross-hatch pattern than a mesh,
Re: ground planes
2012-03-15 by sailingto
I m working on a HF amp layout now based on the EB104 design (pretty well followed by modern manuf on their HF amps). Since max freq would be 30 mhz (maybe
Re: [Homebrew_PCBs] Re: ground planes
2012-03-15 by Malcolm Parker-Lisberg
It does not have to be fine, unless you are at microwave and above frequencies. A course mesh is good enough, 1/4 is fine. Some pcb packages have a mesh fill
Re: ground planes
2012-03-15 by sailingto
I had wondered about the photo etch method and if it had this problem. The mesh method is mentioned - do you mean use a very fine mesh pattern for the solid
Re: [Homebrew_PCBs] ground planes
2012-03-15 by Malcolm Parker-Lisberg
Use a mesh pattern, rather than solid. It happens because the electrostatic charge migrates from large areas. Malcolm I don t suffer from insanity I enjoy
Re: [Homebrew_PCBs] ground planes
2012-03-15 by Leon Heller
... It s a common problem with laser printers. The photo-etch process I use with an inkjet printer handles large copper areas OK. Leon -- Leon Heller G1HSM
Re: ground planes
2012-03-15 by sailingto
Board size range is from 2 X3 to 6 X8 in size. Again, the traces usually look good, just when I have large ground plane areas. Ken H
ground planes
2012-03-15 by sailingto
Does anyone have problems getting large ground plane areas to stay good n solid with copper? I ve been having a bit of problem with large ground plane areas
Re: Cheap copper clad boards
2012-03-15 by sailingto
Do they ship? Is there a website? I d sure get some extra copper clad myself at that price! EVen cut into smaller peices. Ken
Re: [Homebrew_PCBs] Re: toner transfer limits
2012-03-15 by Eldon Brown
Here an example of panelizing using DipTrace - for one of my small Toner Transfer projects. http://wa0uwh.blogspot.com/2012/03/prop-tcvcxo-pcb.html Regards,
Re: [Homebrew_PCBs] Happy Pi Day!
2012-03-14 by Bruce Parham
Assuming we use the first three digits, 3.14, for the date and the rest as a fraction, 0.159265..., of a 24 hr period, that would make the happy epoch at
RE: [Homebrew_PCBs] Happy Pi Day!
2012-03-14 by David C. Partridge
Err I think you lost a 9 after the 3/14 15 - last I looked the value was 3.1415926535 etc. Not sure how you d fit it to a time of day unless you go for decimal
Happy Pi Day!
2012-03-14 by Steve Greenfield
Happy Pi Day, everyone! Everyone knows what time today to celebrate, right? Just a smidge after 1526 and 54 seconds. Remember the celebration for i day?
Re: toner transfer limits
2012-03-14 by sheldon_mp_cooper
This tip only applies to small boards, but when I make things like SMD to DIP adapters, I make multiple copies on the 3 x4 boards I use for such things. The
Re: toner transfer limits
2012-03-14 by tda7000
... I m sure you could use a fuser but you would need to do some modifications I was thinking about it but in the end I went with the laminator because
Re: [Homebrew_PCBs] toner transfer limits
2012-03-13 by Harvey White
... I have one that s sitting there asking to be a project. It s on the list, that s all I can say. I have a thermocouple controller, and I ll be using the
Re: [Homebrew_PCBs] toner transfer limits
2012-03-13 by Bert Van Kets
Thanks for the info. I ll start my tests with through hole and a regular iron. Did anyone ever try to use a fuser unit from an old laser printer? I have an old
Cheap copper clad boards
2012-03-13 by Spencer W
For those with an Ax-Men near them, at least in the Twin Cities, I was able to find A LOT OF single side 36 x 42 thin copper clad boards for $7.50. Passing
Re: [Homebrew_PCBs] toner transfer limits
2012-03-13 by Harvey White
... clean board, good paper, good laminator. ... I find that 10 mil traces are reliable, but somewhat picky to get right. 0.5 mm spacing on a VQFP-100
RE: [Homebrew_PCBs] Re: Thermal insulation for a toaster oven
2012-03-13 by Tony Smith
Been there, done that. The usual stuff works up to 300C, depending on your definition of works. At higher temperatures it goes brittle and breaks down. I
Re: [Homebrew_PCBs] Re: Reflective Thermal insulation for a toaster oven
2012-03-12 by Kim Kemmerly
I have a question about what might be a good reflective thermal insulator for the project under discussion? I am planning on modifiying a similar project and
toner transfer limits
2012-03-12 by Bert Van Kets
Hi all, After a hiatus of many years I m getting back into electronics (robotics in particular). I have made a couple of PCBs using the photo transfer method.
Re: Thermal insulation for a toaster oven
2012-03-11 by rkbradshaw1
One thing you need to consider is that firebrick will hold the heat for a while. This will incease your cool-down and not provide much help on the warm-up
Re: Toner Transfer Failures
2012-03-11 by develpro
... I use acetone to clean my boards. Most types of paint/lacquer thinner, mineral spirits, etc seem to leave an oily film. That would be my first guess as
Re: [Homebrew_PCBs] Thermal insulation for a toaster oven
2012-03-10 by Stefan Trethan
One more thing to be aware of is that building insulation type wool often has binders added to keep the shape. This will burn off at low temperatures so you
Re: [Homebrew_PCBs] Thermal insulation for a toaster oven
2012-03-10 by Paul Whatton
Hi Frank I have a kiln here which I fire up to 1260C. (I don t put my PCBs in it BTW!) It is constructed from fire bricks, ceramic fiber insulation and a
Re: Thermal insulation for a toaster oven
2012-03-10 by David
Don t want to over simplify your issue, but couldn t you put a piece of the fibreglass wool [grab a bit from your attic insulation] in the oven, set it to the
Re: [Homebrew_PCBs] Re: Thermal insulation for a toaster oven
2012-03-10 by Stefan Trethan
I found the correct translation would be rock wool. The term mineral wool includes both. Looks more greenish compared to glass wool. ST
Re: [Homebrew_PCBs] Re: Thermal insulation for a toaster oven
2012-03-10 by Stefan Trethan
You should use mineral wool, it has a significantly higher operating temperature (750°C). Theoretically glass wool should suffice with 500°C but it may be
Re: Thermal insulation for a toaster oven
2012-03-10 by ftkalcevic
I m using it as a general purpose heating oven too (not food). I was using it to preheat some moulds. Sitting at 250C, the Caution Hot Surface sticker on
RE: [Homebrew_PCBs] Thermal insulation for a toaster oven
2012-03-10 by MIKE DURKIN
Why? How often are you going to use it? My toaster oven hits 425°F in 10 minutes and have done a few boards in it with no issues. I use aluminum foil as a
Re: [Homebrew_PCBs] Thermal insulation for a toaster oven
2012-03-10 by KeepIt SimpleStupid
I don t know where to get this stuff, but it works well. Used to use it at work. http://www.fiberfrax.com/ ... From: Harvey White
Re: [Homebrew_PCBs] Thermal insulation for a toaster oven
2012-03-10 by Harvey White
... Not sure, consider firebrick, it might work. Needs some reworking of the oven, though. Harvey
Thermal insulation for a toaster oven
2012-03-10 by ftkalcevic
I d like to improve the efficiency of my cheap toaster oven. I suspect it is like all ovens - a thin sheet metal oven in a thin sheet metal enclosure. And no
Re: [Homebrew_PCBs] KPR developer
2012-03-09 by VK3YV
Hi ,I used to use TRICHLORETHELENE for many years and it worked perfectly, but I don t think you can get it now, been banned. KPR is also no longer available
Re: [Homebrew_PCBs] Re: KPR developer
2012-03-09 by John Anhalt
KPR developer is listed here as a mixture of xylenes, ethylbenzene, and 2-methoxyethylacetate (cas110-49-6). Another name for the latter is ethanol,
Re: KPR developer
2012-03-09 by lemar
Thanks, I ll give that a try. Any idea what the shelf life is for KPR?
Re: KPR developer
2012-03-08 by bebx2000
I think the Datak negative spray-on photoresist is the same as the old KPR. The resist and developer are listed at the bottom of this page,
KPR developer
2012-03-07 by lemar
i have some Kodak KPR photoresist left over from experimenting several years ago but I have not more developer. Any ideas for a substitute for the original?
Re: CNC choices for PCB creation
2012-03-07 by buckeyes1997
I have had some success with Milling PCBs using a 3 axis CNC benchtop machine. I second the recommendation to visit the PCB forum on www.cnczone.com for a lot
Re: PTH Process
2012-03-07 by ohmware
I ve been trying this idea on an experimental board. I purchased some MG Chemicals Silver Conductive Epoxy and have used it to connect the layers on a small,
Re: Etching problem - Help please
2012-03-07 by hotsnausage
I just started doing toner transfer this week after having used a different process for a few years that required too many setup steps. While waiting for my
Re: Toner Transfer Failures
2012-03-06 by John
I have ordered the gbc h212 Laminator and 0.7 mm drill bits. I have also used a spell checker on humbling ! I was using a steam iron before with no water so