Re: Positive resist boards on eBay
2011-04-15 by alex4459jopiklal44
I have bought photo-resist-board at Reichelt.de Its Bungard. and on the boards is a label with 16-2-2013 witch I guess means, it is perfect nearly one year
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Re: [Homebrew_PCBs] Positive resist boards on eBay
2011-04-14 by Leon Heller
... I ve found that resist-coated boards I ve bought sometimes aren t much use when they are more than six months old. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Positive resist boards on eBay
2011-04-14 by Zoran A. Scepanovic
... Hash: SHA1 ... Old boards. I have some scraps that I bought 3 years ago and they need 2.5+ times longer exposure. But, I always buy fresh boards localy so
Re: SMD soldering tool - reinventing the wheel??
2011-04-14 by Andrew
Yes, of course. And ... ? The cheapest hot-air station I ve seen is $150 for an import unit. This soldering tip cost me ... $0.00. :)
RE: [Homebrew_PCBs] SMD soldering tool - reinventing the wheel??
2011-04-14 by Steve Maroney
I think there is something called a hot air soldering station. :) From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of
Positive resist boards on eBay
2011-04-14 by Tom Biery
I have recently used some positive resist boards from eBay and am expereinceing exposure times of up to twice as long as the times it is taking for the
RE: [Homebrew_PCBs] Re: CD shaped PCB
2011-04-14 by Dave
Having dome my induction at FabLab Manchester can I say that even their fairly high power laser cutter (it does 4mm plastic) won t cut PCB because the surface
Re: [Homebrew_PCBs] Re: CD shaped PCB
2011-04-14 by Mark Lerman
There s a guy on eBay selling 1 watt fiber optic coupled diodes that might do the job. The fiber is very small diameter (can t quite remember) so it can be
Re: CD shaped PCB
2011-04-14 by DmitriA
The burning laser diodes in CD recorders are near-IR (780nm), DVD recorders are red (~650nm) and Bluray recorders are, well, blue (405nm) with the latter
Re: [Homebrew_PCBs] Re: CD shaped PCB
2011-04-14 by Kip Shaffer
Here s a variation on your idea that may work well. Some inkjet printers (e.g. the Epson R320) will print on CDs. They already have the straight-path and
Re: CD shaped PCB
2011-04-14 by DmitriA
Sorry for shotting down an otherwise great idea, but having played with these laser diodes quite a bit, specifically in terms of cutting with the beam
Re: CD shaped PCB
2011-04-13 by tda7000
There have been tests with laser cutters into burning off etch resist, Adafruit industries tried it (after first dismissing the idea of directly burning off
RE: [Homebrew_PCBs] Re: CD shaped PCB
2011-04-13 by Boman33
I never thought about the tracking and that the drive might reject it knowing it is not a CD. I was a cute idea even if not practical at all ...... From:
Re: [Homebrew_PCBs] Re: CD shaped PCB
2011-04-13 by Pete Harrison
and in addition,the laser needs a mirror surface to carry out initial focusing and tracking...without that,it will also say no disc,and reject the media.
Re: CD shaped PCB
2011-04-13 by tda7000
I assume just like a writable CD, the lightscribe part also needs a pre-made spiral groove in the material for the laser to follow. If this is not there I
Re: [Homebrew_PCBs] CD shaped PCB
2011-04-13 by Leon Heller
... CD lasers don t have enough power. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] CD shaped PCB
2011-04-13 by Matthew Andrews
I suspect that without some sort of exhaust ventilation you ll have problems with paint residue/vapor coating your optics, and most anything else in the
RE: [Homebrew_PCBs] CD shaped PCB
2011-04-13 by Boman33
From: Zoran A. Scepanovic Sent: Wednesday, April 13, 2011 09:54 ... How would you get the steak otherwise J Bertho [Non-text portions of this message have
Re: [Homebrew_PCBs] CD shaped PCB
2011-04-13 by Zoran A. Scepanovic
... Hash: SHA1 ... It sounds like killing a bull for a steak :) - -- Best Regards, Zoran A. ??epanovi? zastos@gmail.com http://zastos.com +381 63 609-993 -
Re: [Homebrew_PCBs] CD shaped PCB
2011-04-13 by Tim Hills
2 things come to immediately to mind. CD/DVD recorders use Infrared lasers and most photoresist is UV sensitive. I don t know if the resolution of a
CD shaped PCB
2011-04-13 by Boman33
Here is a crazy idea that might just work: A first requirement is being able to cut out a PCB the to look just like a CD. It needs to be accurate and
Re: is it bad ? or not?
2011-04-12 by designer_craig
Thanks, I had a large bottle of 30% reagent grade years ago but finally disposed of it for lack of use. Got it with a bunch of other chemicals form a chemical
Re: is it bad ? or not?
2011-04-12 by RJ
Hey ... thanks .. Being as safe as I can .. I am mixing down to about 9 % peroxide .. The Bottle has a bag wrapped around it during storage .. came that way
Hacker space pc board fabrication
2011-04-12 by Russ Com at ComC
I am looking for people in the Providence ( RI ) area who might be interested in a hacker space with PC fabrication facilities. See
Re: is it bad ? or not?
2011-04-12 by jurod81
If you are interested in fooling around with high strength peroxides (against my advice for beginners since the drug store 3% is strong enough). I would just
Re: is it bad ? or not?
2011-04-12 by RJ
well .. used this formula .. C1V1 +C2V2 / V1 + V2 and got 19% I think .. Hopefully thats the correct formula .. Going to use 9% H202 with a 2:1 ratio of H2O2
Re: is it bad ? or not?
2011-04-12 by RJ
Mixed it . not sure if its exactly 17% .. But at a swimming pool supply place you can get 35% H2O2 .. and I diluted it with the 3% stuff you get in the store
Re: is it bad ? or not?
2011-04-11 by designer_craig
Randy, Where did you get your 17% Peroxide? Craig
Re: is it bad ? or not?
2011-04-11 by RJ
Thanks .. thats a great tool .. Helps a lot .. ok .. so I am going to cut the H2O2 solution again, down to 10 ish percent.. Question .. if I mix equal
Re: [Homebrew_PCBs] Re: is it bad ? or not?
2011-04-10 by Erik Knise
Randy, with 17% H2O2 and 34% HCL the ratio is about even for the reaction. With 3% H2O2 and 34% HCL you need about 5 times as much peroxide as HCL. You can
Re: [Homebrew_PCBs] Re: is it bad ? or not?
2011-04-10 by Harvey White
... As I remember, it started clear, then turned light and transparent green. As the etchant changes, it goes to an olive color/dark green. The 17% peroxide
Re: is it bad ? or not?
2011-04-10 by RJ
ok .. thanks Harvey .. Does it also change color when it calms down? When I added more 3% peroxide .. it changed color.. and slowed down the etching process
Re: [Homebrew_PCBs] is it bad ? or not?
2011-04-10 by Harvey White
... The peroxide is going to decompose and release oxygen, that s what you see. It will calm down in about 30 days to the point where it doesn t want to do
Re: is it bad ? or not?
2011-04-10 by RJ
ok .. it finally calmed down .. I was like .. YIKES !! What have I done .. lol
is it bad ? or not?
2011-04-10 by Randy S.
ok .. 17% peroxide .. 34 % muriatic acid .. mixed 3 : 1 .. never seen copper come off a board that fast .. ever .. did it outdoors .. respirator .. goggles ..
Linx RXM-418-LC-S Receiver Module Needed
2011-04-10 by mandella33
I am in need of several Linx RXM-418-LC-S receiver modules. The item is no longer made, and I have to do some repairs on existing systems. If anyone a lead(s)
Re: SMD soldering tool - reinventing the wheel??
2011-04-09 by Andrew
... Exactly the reason I like having a machine shop in the garage. Not to mention the ability to fab a PCB as needed!
Re: SMD soldering tool - reinventing the wheel??
2011-04-09 by AlienRelics
Sure, they ve been around for a long time. I had one for removing DIP ICs that had a slot in each side for the pins to slip into, applied from the side
Re: [Homebrew_PCBs] SMD soldering tool - reinventing the wheel??
2011-04-08 by DJ Delorie
I have a tip like that for 0603 s and never use it, because I splurged on a Talon. Similar idea, though. An alternate way to de-solder SMTs: use a $20
RE: [Homebrew_PCBs] SMD soldering tool - reinventing the wheel??
2011-04-08 by David C. Partridge
Yes, new wheels every day ... This is nothing new I fear, lots of tips like that for the professional makes of iron (Metcal, Pace, etc.). D. ... From:
SMD soldering tool - reinventing the wheel??
2011-04-08 by Andrew
I needed to remove some SMD ICs from a board that had a design flaw. My current reflow setup is not quite hot enough to make removing ICs an easy task, and I
Re: [Homebrew_PCBs] Re: ground planes - two sides, or just one?
2011-04-07 by Adam Shea
There can be problems with having large planes near high frequency signals as you get more capacitive loading, but I usually work on power converter stuff
RE: [Homebrew_PCBs] Re: ground planes - two sides, or just one?
2011-04-07 by David C. Partridge
Henry Ott s book Electromagnetic Compatability Engineering is the bible in this arena. Dave ... From: Homebrew_PCBs@yahoogroups.com
Re: ground planes - two sides, or just one?
2011-04-07 by Andrew
Tell me more about ground loop conductance -- this sounds like the kind of thing that I was concerned about, though without really knowing what or why.
Re: ground planes - two sides, or just one?
2011-04-07 by Andrew
Thanks, Bill, I will check this out.
Re: HP Laserjet 4050 prints over-size
2011-04-07 by Andrew
David, I m sorry to hear about the problems you had with KiCad. It actually is possible to print multiple layers on a single page -- there are checkboxes to
Re: ground planes - two sides, or just one?
2011-04-07 by Andrew
Adam, This gets at an issue I was wondering about -- I was aware of designs that have a power plane on one side and ground plane on the other, and was not sure
Re: ground planes - two sides, or just one?
2011-04-07 by Jeanette
I just made some low-impedance boards for power supply regulators. Using a star ground on the bottom of the board, at the nucleus I punched a 0.031 hole. On
Re: [Homebrew_PCBs] ground planes - two sides, or just one?
2011-04-07 by William Laakkonen
Andrew, I highly recommend reading all the tips at the Hott Consultants web site. As you question is very general, it may help guide you a bit. I worked for a
Re: HP Laserjet 4050 prints over-size
2011-04-07 by tda7000
KiCAD can print all layers on one sheet, you just need to select the correct option in the print dialog. (Choose Single Page rather then 1 page per layer