Re: Glue 2 pieces of copper clad back to back?
2010-02-12 by sailingto
Given up on Toner Transfer? You must be using the process I tried first. Once I finally broke down and got a $90 laser printer and a $25 GBC laminator toner
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PCB tools
2010-02-12 by Steve Greenfield
PCB Trace width calculation tool in Java. Current, voltage, thickness, buried traces or surface. Link to a Via calculator. Based on the latest IPC-2221 specs.
Re: [Homebrew_PCBs] Re: Best order in which to expose 2 sided sensitized boards
2010-02-12 by Barry Demers
Just sent off a post reply talking about the sandwich method. I ll need to try that. Double sided exposure. I will need a different press for holding the
Re: [Homebrew_PCBs] Re: Glue 2 pieces of copper clad back to back?
2010-02-12 by Barry Demers
Thanks. I have had a miserable time with the transfer method, and have pretty much given up on that procedure. Lining up 2 pieces of film is leaving me
Re: Best order in which to expose 2 sided sensitized boards
2010-02-12 by designer_craig
Barry, I have done a lot of DYI two sided boards. My tecnique was to form a envleope or pocket from the top and bottom side films. Its best to have the films
RE: [Homebrew_PCBs] Re: GBC laminator
2010-02-12 by Roger Blair
Ken, When approved, it should show up here: http://groups.yahoo.com/group/Homebrew_PCBs/photos/album/1587588139/pic/list Regards, Roger From:
Re: Glue 2 pieces of copper clad back to back?
2010-02-12 by sailingto
There have been several folks who make double sided that way - I did once and it worked just fine. Now I use double sided board with toner transferred to both
Re: GBC laminator
2010-02-12 by sailingto
Roger - could you post in the files section? I don t have the H-65 but am always interested in mods - might find something I could use on my GBC. Ken H
Re: [Homebrew_PCBs] Measurements for the male side of an edge connector?
2010-02-12 by lists
In article , ... There are, or at least were, a number of different pitches used. -- Stuart
RE: [Homebrew_PCBs] GBC laminator
2010-02-12 by Roger Blair
Oops, I forgot that this group doesn t do attachments. I forwarded it to Ross s personal address. If anyone else wishes, I can post it to photos. Roger From:
RE: [Homebrew_PCBs] GBC laminator
2010-02-12 by Roger Blair
Ross, Attached is my attempt at reverse engineering. Not sure it is exactly right, though. Regards, Roger From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] Measurements for the male side of an edge connector?
2010-02-12 by Stefan Trethan
The correct pattern is determined by the mating connector. You should find the recommended pattern in it s datasheet, like this for example:
Glue 2 pieces of copper clad back to back?
2010-02-12 by demers_barry
Any success with taking .032 single sided and gluing to another to form a 2 sided board. This seems plausible to me, but interested if anyone has actually
Measurements for the male side of an edge connector?
2010-02-12 by Steve Greenfield
I ve done quite a bit of Googling, and all I find are diagrams and measurements of edge-connector sockets. Or just the outer dimensions of the PCB
Re: [Homebrew_PCBs] Re: How to deburr drill holes (vias) ?
2010-02-12 by DJ Delorie
Note that foils only work if your drill can press down on the foil next to where it s going to drill, to keep it against the copper.
Re: GBC laminator
2010-02-12 by sailingto
I m not sure what the H-65 laminator is, but if it s anything like the cheap GBC Personal Laminator it shouldn t be very heard to mod. How are you wishing to
Re: GBC laminator
2010-02-12 by James
... Assuming this is a Chinese thing, you won t find a schematic unless somebody reverse engineered one, and even then, yours might be different internally.
Re: How to deburr drill holes (vias) ?
2010-02-12 by AnnonChicken
Thanks guys. I think I can go up to 24K RPM max. I m ordering some aluminum foils and tungsten carbide drills to try it out. If it works, I will post here as a
Re: [Homebrew_PCBs] Re: VIA pins - found them
2010-02-12 by DJ Delorie
... Yup, I know about those. They re huge compared to what I normally solder in for vias. I m looking for something designed to work with a 13.5 mil drilled
Re: [Homebrew_PCBs] Re: VIA pins - found them
2010-02-12 by KeepIt SimpleStupid
http://www.delorenzo.com.mx/prods_i/prods/proto/through/index.htm http://www.t-tech.com/order/category.asp?sectionid=2&catid=65&catname=Thru+Hole+Materials ...
Re: [Homebrew_PCBs] Re: Printed circuit board eyelets
2010-02-12 by KeepIt SimpleStupid
I bout some, some 20 years ago probably from an Electronics distributer called Priority 1 Electronics. I don t think they are around anymore. They could
RE: [Homebrew_PCBs] Re: laminator heat specs
2010-02-12 by Jim Barnes
Hi, Thanks. Yes, either the TMC Hallcrest or the Tempil product would seem be what I remember and would seem to do the job. I’m suffering sticker shock from
Re: [Homebrew_PCBs] Re: laminator heat specs
2010-02-12 by Kerry Wentworth
Like this? http://www.tmchallcrest.com/ Kerry
Re: [Homebrew_PCBs] Re: laminator heat specs
2010-02-12 by Donald H Locker
One of the items on is the product you remember, I think. Donald.
Re: [Homebrew_PCBs] Re: laminator heat specs
2010-02-12 by Donald H Locker
Search for tempil are the folks who make temperature-sensitive paper and plastic markers. Donald.
RE: [Homebrew_PCBs] Re: laminator heat specs
2010-02-12 by Jim Barnes
Hi, Long ago (20-plus years), when I worked in aerospace, we had little paper strips that we attached inside a unit to find out how hot it got during test. As
Re: [Homebrew_PCBs] Re: How to deburr drill holes (vias) ?
2010-02-11 by Leon Heller
... My drill is 18,000 rpm and I use reduced shank tungsten carbide drills. Leon
Re: [Homebrew_PCBs] Re: How to deburr drill holes (vias) ?
2010-02-11 by Stefan Trethan
Sharp carbide drills. The proper speed is as fast as you can ;-) 30 or even 50k RPM would be nice, the slower the RPM the slower the feed should be. The drills
Re: How to deburr drill holes (vias) ?
2010-02-11 by AnnonChicken
Thanks Stefan. I m going to try that technique.
Re: How to deburr drill holes (vias) ?
2010-02-11 by AnnonC
Leon, My drill speed is 10,000 RPM. How fast do you think a proper speed should be? And what kind of sharp drill do you recommend? Thanks Lanny
Re: [Homebrew_PCBs] How to deburr drill holes (vias) ?
2010-02-11 by Googlemail
Some say using a thin sheet of 0.2mm aluminium on top of the board - an entry board, can help. I get a piece of wet and dry sand paper and go over the board
Best order in which to expose 2 sided sensitized boards
2010-02-11 by demers_barry
Using, in this example, a 2 sided positive acting pre-sensitized board. I have well constructed frame to hold the pcb and film in place while exposing to
Re: [Homebrew_PCBs] How to deburr drill holes (vias) ?
2010-02-11 by Stefan Trethan
And if that isn t enough an aluminium cover plate and or suitable bottom doubler can be used, or so I am told. ST
Re: [Homebrew_PCBs] How to deburr drill holes (vias) ?
2010-02-11 by Leon Heller
... Use sharp drills at the proper speed. Leon
How to deburr drill holes (vias) ?
2010-02-11 by AnnonC
I m looking for a method to deburr my ground vias to smooth the drill hole for copper plating. I do RF prototypes and the PCB has a lot of ground vias. In the
GBC laminator
2010-02-11 by ross b
Hi All: I would like to modify my GBC H-65 laminator, does anyone have or know where to find the wiring schematic, a google search turned up nothing,any help
Re: laminator heat specs
2010-02-11 by sailingto
Looking at part numbers? Of what? Thermal switch? I ve looked at those numbers and did a search but couldn t find any data giving the cutoff temperature of
Re: [Homebrew_PCBs] Re: laminator heat specs
2010-02-11 by DJ Delorie
Try opening it up and looking at the part numbers. The roller temp isn t always the same temp as the cutoff unless you can measure it *between* the rollers.
Re: laminator heat specs
2010-02-11 by sailingto
My sensor (I think a AD22100) only goes to 150C (302F) and provides the input voltage to an AVR ATmega168 chip - sorta limits how high the temperature can be
Re: slightly off topic: recommended glue for attacing one circuit board to another
2010-02-11 by Dale
Another vote for silastic (RTV, silicone rubber, etc). I haven t used it on PCB Assy s, but I HAVE used it to hold things together that I expect to
Re: [Homebrew_PCBs] Re: laminator heat specs
2010-02-11 by DJ Delorie
... Hmmm.. I set mine at 340 F and run it through *once* and it works just fine.
Re: [Homebrew_PCBs] Re: Printed circuit board eyelets
2010-02-11 by DJ Delorie
... I ve seen big ones for 1/16 board. I want small ones for 1/32 board.
Re: slightly off topic: recommended glue for attacing one circuit board to another
2010-02-10 by Frank P
If you are going to have to attach and remove the board often, I would use velcro.... Adhesive foam is the best for permanent solutions.
Re: laminator heat specs
2010-02-10 by sailingto
You ask a very good question there, I m *almost* positive it s 260F, NOT 360F. 360 is almost up at 400F where the Brother laser I had required, but after
Re: [Homebrew_PCBs] Re: Printed circuit board eyelets
2010-02-10 by Stefan Trethan
Actually they do make those pins exactly for this purpose. They are tapered and come connected end to end as a little rod, you simply break them off one by
Re: [Homebrew_PCBs] Re: Printed circuit board eyelets
2010-02-10 by DJ Delorie
I wonder if they could make via-pins? Just a simple pre-cut wire with a flange on one end, designed to press-fit into a 13.5 mil hole and be soldered on both
Re: [Homebrew_PCBs] Re: slightly off topic: recommended glue for attacing one circuit board to another
2010-02-10 by kabowers@NorthState.net
... Good way to go. You may want to use the electronic version that cures without the vinegar smell to avoid the possibility of corrosion. Keith Bowers
Re: slightly off topic: recommended glue for attacing one circuit b
2010-02-10 by Lee Studley
I like the GOOP in the blue tube from HomeDepot or dept stores. It s a clear vinyl glue the has the consistency of thick molasses. It evolved from the famous
Re: slightly off topic: recommended glue for attacing one circuit board to another
2010-02-10 by Richard
... Hot-glue is pretty tough stuff to remove. But I think a viable candidate is RTV rubber which comes in a tube like toothpaste. You can squeeze a blob on the
Re: Printed circuit board eyelets
2010-02-10 by Richard
... This is my favorite vendor: http://www.intl-eyelets.com/ In addition to making all kinds, types and sizes of eyelets, they also make an extremely useful