Re: [Homebrew_PCBs] etched 5/5 results
2008-07-07 by DJ Delorie
Teardrops, named for their shape, put extra copper at the intersection of traces and pads. The idea is to ensure an electrical connection between the trace
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Re: [Homebrew_PCBs] Solder Bath
2008-07-07 by Leon
... From: Viper62pr To: Sent: Monday, July 07, 2008 3:44 PM Subject: [Homebrew_PCBs] Solder Bath
Re: [Homebrew_PCBs] Re: Exposure timer
2008-07-07 by Leon
... From: Howard To: Sent: Monday, July 07, 2008 3:20 PM Subject: [Homebrew_PCBs] Re: Exposure timer
Solder Bath
2008-07-07 by Viper62pr
Greetings all, I was wondering if anyone in the group has used a solder bath to solder their boards, if so, how do you apply flux to the board and, which flux
Re: Exposure timer
2008-07-07 by Howard
... finished ... Hi Its been some time now, hows it going ? any news on the exposure timer that you were doing ? Howard
throughole PCB with electrochemical
2008-07-07 by fan_nastelroy
i ve made aluminum anodized with H2SO4 & H3PO4, and i think i can use this ways to make vias at double layer PCB., can anyone help me?
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-07 by Leon
... From: fana cute To: Sent: Monday, July 07, 2008 9:59 AM Subject: Re: [Homebrew_PCBs] etched 5/5
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-07 by fana cute
teardrop? i dont understand what is this? where i can get it ... From: Leon Subject: Re: [Homebrew_PCBs] etched 5/5 results To:
Direct Inject PCB Supplies for Sale
2008-07-06 by hal91k
Hi Everyone, A while back, I worked on using a Epson C84 printer to print PCB s (following http://techref.massmind.org/techref/pcb/etch/c84-st.htm) Although it
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-06 by Leon
... From: Stefan Trethan To: Sent: Sunday, July 06, 2008 3:00 PM Subject: Re: [Homebrew_PCBs] etched
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-06 by Stefan Trethan
The burrs seemed a bit rough, but it s hard to judge with magnification sometimes. I found the proxxon tools have better runout, probably in part due to the
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-06 by Myc Holmes
The real problem is that I m only using a dremel tool, so the runout in the bit is almost as much as the annulus size! The pads are not designed for homebrew
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-06 by DJ Delorie
... I ll probably bend the wire over anyway, and solder it to the trace. I ve been doing that on my other boards recently and it seems to go almost as quick as
RE: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-06 by Bertho Boman
Try a regular good flash light or a halogen desk lamp. It works surprisingly well. A related trick if this method is used is to not use two identical targets
Re: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-06 by Michel Baguet
I just find a way to solve the print geometry problem. Now I m going to test blind alignment with needles and holes in the PCB of the same diameter. ... From:
RE: [Homebrew_PCBs] double sided PCB, accuracy - 2nd part - solved
2008-07-06 by Michel Baguet
Printing the grid and other geometrical drawing , I pinpointed the problem. There is nothing on the vertical direction. The horizontal direction has a non
Re: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-06 by Philip Pemberton
... Perhaps a strobe light would be powerful enough. Assuming you could get used to the flickering :) But seriously, what about this -- 1 piece of FR4, 1.6mm
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-06 by Stefan Trethan
Might be better to drill next to the vias and bend the wire over, this way the drill won t rip the copper off. Generally i d rather not push the limits of
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-06 by DJ Delorie
... I added a photo of the finished board. I watched the etch more carefully this time. As it got nearer to done , I d take it out, rinse and dry it, and
RE: [Homebrew_PCBs] Re: Eyelet press recommendation
2008-07-05 by Bertho Boman
Here is an interesting piece of related information: A lot of years ago one major company, that I am not allowed to mention, was eyeletting double sided PCB
Re: [Homebrew_PCBs] Re: Eyelet press recommendation
2008-07-05 by Stefan Trethan
I most definitely remember reading somewhere that a completely dry iron (free of any solder) is to be used to reflow eyelets, else the solder will close the
Re: [Homebrew_PCBs] Re: Eyelet press recommendation
2008-07-05 by Harvey White
... Solder plated just means that they solder a bit more easily, and go better with tin/lead plated boards. I haven t had a problem with either type. Harvey
Re: [Homebrew_PCBs] Re: Eyelet press recommendation
2008-07-05 by JanRwl@AOL.COM
In a message dated 7/5/2008 11:52:01 A.M. Central Daylight Time, gustavo@tenrreiro.com writes: For those of you who have used the International eyelets, which
Re: [Homebrew_PCBs] Re: Eyelet press recommendation
2008-07-05 by Gustavo Tenrreiro
Thanks for the replies. For those of you who have used the International eyelets, which type have you used ? ( i.e. flat, funnel or rolled flange ). Also what
RE: [Homebrew_PCBs] double sided PCB, accuracy - 2nd part
2008-07-05 by Bertho Boman
Try printing a grid, for example 10 x 10mm, across the page and measure it to see what is actually happening. If there is a linear error in one direction you
double sided PCB, accuracy - 2nd part
2008-07-05 by Michel Baguet
I made prints on 76µ (3mil) polyester drawing paper, I bought them 20 years ago to make PCB, using a pen plotter and UV exposure. This paper is very stable
Re: Eyelet press recommendation
2008-07-05 by torquemada40223
If they re simple eyelets, you might just use a small steel plate and a transfer punch. When I built an amplifier a bit ago, I used a transfer punch to stake
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-05 by DJ Delorie
... Hmmm... Hadn t thought of it that way. Of course, since I m using special paper (Silkjet or Jetstar at the moment), my options are limited. Neither have
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-04 by John Coppens
On 04 Jul 2008 17:57:16 -0400 ... That s what I meant - if the paper is just slightly thicker, the paper would advance (microscopically) faster. Even when the
Re: [Homebrew_PCBs] Eyelet press recommendation
2008-07-04 by Mike Young
I haven t bothered in quite a few years... I ground and filed flat the tip of a spring-loaded centerpunch. The anvil is just whatever was suitable and lying
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-04 by DJ Delorie
... I don t think so. The pattern is regular, and depends on where on the image it is, and doesn t correspond to my own accuracy tests I did last week or so.
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-04 by Stefan Trethan
I haven t followed the discussion, but i assume the printer calibration settings were tweaked already? There is a tool for epson printers to adjust all kinds
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-04 by John Coppens
On 04 Jul 2008 17:15:12 -0400 ... Couldn t the comb indicate that the paper thickness is incorrect? Maybe slightly thinner/thicker paper would cause the error
Re: [Homebrew_PCBs] Eyelet press recommendation
2008-07-04 by Harvey White
... It s toner transfer onto the board, then a white film available from pulsar (www.pulsar.gs). Avoid having the stuff over traces and it does much better. I
Re: [Homebrew_PCBs] today's problem...
2008-07-04 by DJ Delorie
... Ah! Yes, it could be that. I ll add spray print with compressed air to my list of things to do. No, I m not going to try rinsing it ;-) I suppose I
Re: [Homebrew_PCBs] etched 5/5 results
2008-07-04 by DJ Delorie
... Thanks! ... It seems to be related to paper feed through the printer. I mean, moving a sheet of paper with 1/2880 accuracy isn t easy. The weaving
Re: [Homebrew_PCBs] today's problem...
2008-07-04 by Leon
... From: DJ Delorie To: Sent: Friday, July 04, 2008 9:25 PM Subject: Re: [Homebrew_PCBs] today s problem...
RE: [Homebrew_PCBs] etched 5/5 results
2008-07-04 by Bertho Boman
Your system is getting better and better! I am curious though why the comb pattern is only on one side. Did you figure out why? Bertho
etched 5/5 results
2008-07-04 by DJ Delorie
I added the results of a 5/5 etch to my inket page: http://www.delorie.com/pcb/inkjet/ I decided to be cautious this time. As soon as the big blank spots
RE: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-04 by Bertho Boman
Why blind alignment? Crank up enough backlight and you should be able to see through the paper. Bertho From Michel Baguet Sent: Friday, July 04, 2008
Re: [Homebrew_PCBs] today's problem...
2008-07-04 by DJ Delorie
... It s got the color of resist film. I m pretty careful about rinsing the film and board just before they come together.
Re: [Homebrew_PCBs] Eyelet press recommendation
2008-07-04 by Michel Baguet
What do you use to make a white silkscreen ? ... From: Harvey White Subject: Re: [Homebrew_PCBs] Eyelet press recommendation To:
Re: [Homebrew_PCBs] today's problem...
2008-07-04 by Leon
... From: DJ Delorie To: Sent: Friday, July 04, 2008 8:14 PM Subject: [Homebrew_PCBs] today s problem... ...
today's problem...
2008-07-04 by DJ Delorie
Anyone see these extra bits of photomask after developing? http://www.delorie.com/pcb/inkjet/mask-bits.jpg This is at 200x, the gap is only 6 mil. I ve tried
Re: [Homebrew_PCBs] Eyelet press recommendation
2008-07-04 by Harvey White
... A via is used only to connect the top and bottom layers, but not at a parts lead. That way, I do not have to worry about the hole in the eyelet. ...
Re: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-04 by Michel Baguet
Good idea, using the drill bits as a guide to align the sheet, same diameter as the holes should avoid misalignment ... From: DJ Delorie
Re: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-04 by Michel Baguet
A few days ago, I read on HP website that they are using a special mean to fuse the toner with the transparent so no possible release . ... From: DJ Delorie
Re: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-04 by Michel Baguet
indeed for uv exposure but I m doing toner tranfer ... From: Leon Subject: Re: [Homebrew_PCBs] double sided PCB, accuracy To:
Re: [Homebrew_PCBs] Eyelet press recommendation
2008-07-04 by Gustavo Tenrreiro
... What do you mean separate vias ? ... can you expand a bit here ? I assume the piece of steel is flat, and you place your PCB with the eyelet in place on
Re: [Homebrew_PCBs] double sided PCB, accuracy
2008-07-04 by DJ Delorie
... Keep in mind I use 6/6 rules with 13 mil via drills, so some success for me might be just fine for you. Success for me is within 4-5 mils of dead