Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-19 by Brad Thompson
Hello-- ... he must be getting up there age wise). He was pretty detailed in some of his responses and he maintains a website (tinaja.com). I tried the best
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Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by rolohar@...
Quote: But why in 40 years nobody has taken some color photos of the prototype’s boards is beyond me. ................................ I think that the
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by rolohar@...
I believe that the unit with the brown paper mother board was a homebrew board, now that I re-read the item (photos) I posted. However the unit looks neat
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Harvey White
... Actually, no. The 6845 did 80 by 40 amongst other thins, the other chip is either the 68047 (AMI) or the 6847(Y) from Motorola. It s essentially the
RE: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Andrew Volk
I suspect the part you were referring to is the 6845, the CRT chip used in the first IBM PCs. From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Harvey White
On Fri, 18 Mar 2016 13:36:03 -0700, you wrote: ... Then a suggestion I d have would be to go do what you want, but be reasonable about the definition of
RE: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Brad
The only original photos of the PCBs that I’ve found are the black and whites that appear in the magazine article. And unfortunately apart from color, I
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by rolohar@...
My last and final blab about Lancaster s TV Typewriter enterprise: Shows a basic or motherboard as we would call it in modern times, and this one appears to
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by rolohar@...
... Brad unclefalter@yahoo.ca : Before spending a lot of time and frustration in trying to build the old Don Lancaster TV-Typewriter project in any of the
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Harvey Altstadter
Roland, I don t think it is about time or money. This is a challenge and a learning experience. Stuff we do for fun. When I first saw this thread, I went
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Cecil Bayona
I built one to replace my clunk model 45 Teletype, eventually I replaced it with a Televideo 950. ... -- Cecil - k5nwa http://thepartsplace.k5nwa.com/ I built
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Harvey Altstadter
Brad, I will address how I did things back in Medieval times below. First, I will tell you how to get natural color FR-4. I did a little detective work by
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by rolohar@...
Anyone Interested: Before spending a lot of time and frustration in trying to build the old Don Lancaster TV-Typewriter project in any of the several
RE: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Brad
Also on the original front – I don’t think anyone harboring an original TVT project would be willing to give it up for less than lots of money, given how
RE: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by Brad
I agree with much of what you said in principle. For me, this project is just about creating something you cannot buy. There is only one prototype TVT and it
Re: [Homebrew_PCBs] TV Typewriter: Custom G10 copper clad
2016-03-18 by rolohar@...
Yeah And besides, there are scant few folks around in hobby electronics nowadays that have ever actually laid eyes on a finished (or unfinished) Lancaster TV
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Harvey White
On Fri, 18 Mar 2016 09:03:23 -0700, you wrote: Hit return too quickly. ... All the G10 is likely FR4, I don t see a real difference in color or grain. ...
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Harvey White
... The colors are biased by the board material (now available in all sorts of colors, black is particularly nice for displays), and the silk screening. Silk
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-18 by Stefan Trethan
You can buy pre-sensitized boards or apply your own photoresist, as a liquid varnish or film. Most people are going to look at you as if you are crazy for
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Cecil Bayona
A place to look for reasonable prices is eBay, I buy my PCBs there at reasonable prices, photos are included, several times I have seen PCB in .010 size, I
RE: [Homebrew_PCBs] Custom G10 copper clad
2016-03-18 by Brad
With photoresist though, the boards have to be bought pre-sensitized right? Here is an example of the artwork Radio Electronics offered in their construction
RE: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Brad
Thanks for this very excellent explanation. It’s doubly hard being a newbie but also trying to understand how things were done back in the day. Because this
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Harvey White
... Thinking of all the HP and Tek equipment I have that dates from that time, I ll agree with you. No solder mask (although I ve seen some, a different
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-18 by Harvey Altstadter
I just looked at some old boards that I still have. They are about the same color as the current material, maybe a shade or two darker. To my mind, it makes
RE: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by Brad
Yes, the TVT design I think is basic enough it’d work on virtually any single side copper clad PCB. I’m just being particular because this is a
Re: [Homebrew_PCBs] Re: Custom G10 copper clad
2016-03-17 by Harvey White
... I like the name. The main thing I saw between the two grades was exactly what you mentioned, the addition of bromine to make the board less flammable. I
Re: Custom G10 copper clad
2016-03-17 by hrconsult@...
Hi guys, I have been following this group for many months, and I am very excited to see the quality of the discussions presented here. I have not contributed
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by Harvey White
... I think what they re doing is taking G10 and laminating the copper directly on it, a one-of custom job. That s for bare boards, not even made and drilled.
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by camillus
Are those boards gold plated or something??? $400.00 sure that snot a typo??? cb On 3/17/2016 3:57:52 PM, Stefan Trethan stefan_trethan@gmx.at [Homebrew_PCBs]
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by Stefan Trethan
I d guess the 0.01 boards might be intended for multilayer... ST On Thu, Mar 17, 2016 at 3:41 PM, Norm w6nim@frontier.com [Homebrew_PCBs]
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by Stefan Trethan
I didn t follow the conversation before, but $400 for a couple pieces regular FR4 seems pretty crazy to me. ST On Thu, Mar 17, 2016 at 3:05 AM, Brad
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by Norm
... Way back then (60 s-70 s), the very thin boards were used for commercial production. Hobby boards were thicker - 0.062 probably most common. I recall
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by rolohar@...
Brad: Can I assume that the quest for G10-epoxy glass material is for cosmetic purposes only? What I am trying to achieve is as close to a copy of the
RE: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by Brad
What I am trying to achieve is as close to a copy of the original prototype boards Don made that I can muster. When I asked him what the material was, all he
Re: [Homebrew_PCBs] Custom G10 copper clad
2016-03-17 by rolohar@...
On Behalf of Brad ; Excuse my lack of knowledge.........but why is it important to use GIO epoxy-glass PCB material for the Lancaster TV typewriter circuit
Custom G10 copper clad
2016-03-17 by Brad
Hey guys, Some of you might remember my queries about trying to get correct looking single side copper clad PCBs for my vintage TV Typewriter project. I
First try at DIY Solder Mask
2016-03-16 by duwaynes@...
My latest project has several SMD components. Last time I did this I had some problems when I soldered the parts. It took a lot of effort to prevent solder
Re: DIY plated through holes.
2016-03-11 by dpower56@...
saw it quite awhile ago. The process seemed both laborious and costly. Some of the chemicals have dual uses and have been added to chem supplier watch list for
DIY plated through holes.
2016-03-09 by Jeff Heiss
Youtube has a video on making plated through holes. The results look impressive. Has anyone tried it? Go to 34:25 for images.
[Homebrew_PCBs] Easy Double Sided PCBs via DLP
2016-03-08 by Mark Lerman
Hello all, I ve just published a new Instructable (my third on DLP) detailing my process for making double sided pcbs using a modified laser printer to print
Spoken for: FS: book, "My Life With The Printed Circuit" [Homebrew_PCBs]
2016-03-08 by Brad Thompson
Hello-- The book is sold. Thanks, and 73-- Brad AA1IP
FS: book, "My Life With The Printed Circuit" [Homebrew_PCBs]
2016-03-08 by Brad Thompson
Hello-- I m offering FS one only copy of My Life With The Printed Circuit , by Paul Eisner, 1st edition, published in June, 1989, Lehigh University Press,
Re: [Homebrew_PCBs] Finished boards
2016-03-08 by duwaynes@...
I use Eagle and can upload the file directly to OSHPark. Their online upload function will show you what the board will look like. You can also upload gerber
Re: [Homebrew_PCBs] Finished boards
2016-03-01 by richard@...
Agree with that fully. I only once supplied a native file which had a rectangular pad each side with very dense vias. The idea was to try to solder a power-pad
Re: [Homebrew_PCBs] Finished boards
2016-03-01 by richard@...
Eagle is fine, I believe some of them have an Eagle rules file for download. Most manufacturers want Gerber files, one file per layer, but some will take
Re: [Homebrew_PCBs] Finished boards
2016-03-01 by richard@...
Well, Pcbway turn the boards round in an advertised 3-5 days, but I have yet to know them take more than 3 days, and sometimes overnight. If you pay for DHL
File - monthly.txt
2016-03-01 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: Plotter ink as resist? (was: Re: [Homebrew_PCBs] Re: drill pcb)
2016-02-29 by keith printy
Just a thought , anyone thought of using nail polish ? it is a laquer and you could likely dilute it so the printer can spray it on the boards. From:
RE: Plotter ink as resist? (was: Re: [Homebrew_PCBs] Re: drill pcb)
2016-02-29 by Dave G4UGM
... I have a number of plotters and plotting with a Staedtler Narrow Red gives enough etc resistance for reasonable boards, but a Narrow Red isn t very narrow,
Plotter ink as resist? (was: Re: [Homebrew_PCBs] Re: drill pcb)
2016-02-29 by Brad Thompson
On 2/28/2016 11:55 PM, Stefan Trethan stefan_trethan@gmx.at [Homebrew_PCBs] wrote: As far as I know Staedtler Lumocolor red is the best resist ink. It is