Re: [Homebrew_PCBs] Re: tqfp package with TT?
2004-04-08 by Leon Heller
... From: Steve To: Sent: Wednesday, April 07, 2004 10:52 PM Subject: [Homebrew_PCBs] Re: tqfp
Messages
Browse messages
Page 607 of 707 · 35337 messages matched
[Homebrew_PCBs] horizontal etch - bottom side way faster
2004-04-08 by Stefan Trethan
Hi just want to inform you that the bottom side is etched MUCH faster in a horizontal etch setup. HCl H2O2, from time to time moving the container around to
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-08 by Leon Heller
... From: Stefan Trethan To: Sent: Wednesday, April 07, 2004 12:49 PM Subject: Re: [Homebrew_PCBs]
Re: tqfp package with TT?
2004-04-08 by Phil
... to ... 300 DPI equates to 3.33 mils/dot. that makes a 10 mil trace all of 3 dots wides. On a 600 DPI device, that would be 6 dots. 1200 DPI - 12. Of
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-08 by Adam Seychell
... I always thought a substance of low vapor pressure would evaporate less than a substance of high vapor pressure. I can tell you concentrated phosphoric
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-08 by Adam Seychell
... I always thought a substance of low vapor pressure would evaporate less than a substance of high vapor pressure. I can tell you concentrated phosphoric
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-08 by JanRwl@AOL.COM
In a message dated 4/7/2004 7:26:25 AM Central Standard Time, stefan_trethan@gmx.at writes: i know it is added in some drink, like cola Only a FRACTION of 1% !
Re: [Homebrew_PCBs] Re: cucl - i don't understand this!
2004-04-07 by Jeremy Taylor
I dont think anybody here recently said you need to add copper sulfate, as we all now know, as soon as you put the first board in, you have some. Unless the
Re: [Homebrew_PCBs] Re: cucl - i don't understand this!
2004-04-07 by Stefan Trethan
Add my 2 pounds to it ;-) But i really wonder why the fresh etchant is so much faster... seems stupid that all the cucl recepies call for adding cucl
Re: cucl - i don't understand this!
2004-04-07 by Steve
Anyone near me (Tacoma, WA) want about 6 or 7 pounds of dry FeCl cheap? ; ) Steve ... concentrated any ... hydrometer ... it makes
Re: [Homebrew_PCBs] Re: tqfp package with TT?
2004-04-07 by Stefan Trethan
... yes.. thanks for replying.. twice ;-) ? i guess it is because yahoo is really lame with the postings.. huge delays everywhere today... As said in the other
Re: tqfp package with TT?
2004-04-07 by Steve
Wow! And I just saw an ad in last sunday s paper for a $99 1200dpi laser printer. Office Max or Office Depot or maybe CompUSA. Stupid rebates... Steve
Re: [Homebrew_PCBs] Re: tqfp package with TT?
2004-04-07 by Stefan Trethan
On Wed, 07 Apr 2004 18:01:30 -0000, wheedal99 ... That s what i want to read... thank you... However - i just tried to print the
[Homebrew_PCBs] cucl - i don't understand this!
2004-04-07 by Stefan Trethan
just mixed the etchant for the new tank - put a small test piece in and it worked WAY faster than the old etchant did.. you could watch it dissolving (no more
Re: [Homebrew_PCBs] Re: tqfp package with TT?
2004-04-07 by Stefan Trethan
yes, and yes... the traces widen because of the pressure in the fuser. but i have played with the sprigs and now i can adjust it a bit to see if i get good
Re: tqfp package with TT?
2004-04-07 by wheedal99
Yahoo groups is really iffy on posting these days. Anyway here it is again: The website I put up a while ago shows just such a usage.
Re: [Homebrew_PCBs] Re: Phosphoric Acid Etch
2004-04-07 by Jeremy Taylor
http://www.efma.org/publications/guidance/section16.asp Release of phosphorus oxides (toxic) from thermal decomposition and of hydrogen from reaction with
Re: [Homebrew_PCBs] tqfp package with TT?
2004-04-07 by Stefan Trethan
... correct.. i measured... ... that is not good. I d rather hear that s no problem at all. well, this minute the new PCB holder is completed, and i completed
Re: tqfp package with TT?
2004-04-07 by Phil
I have no trouble with 10 mil traces with TT. You might want to just try it out. 12 mil pads, 8 mil seperation could do it. I suspect aligning the package
Re: tqfp package with TT?
2004-04-07 by wheedal99
... they ... ??? Stefan http://myweb.cableone.net/wheedal/pcb.htm uses a 100 pin tqfp with 19.685 mil spacing (center to center) Xilinx CPLD.... It is do-able.
Re: tqfp package with TT?
2004-04-07 by rmustakos
I m about to try some TT stuff. I m not ready to etch, yet, but I want to play with TT some to get the transfer right. I printed out a design with 6 mil
Re: Phosphoric Acid Etch
2004-04-07 by dsv1486
It was very inexpensive as I purchased it from a hydroponics shop that was closing. It was $5 for 5 gallons of 89% concentration. I did not notice the
Re: Phosphoric Acid Etch
2004-04-07 by dsv1486
It was very inexpensive as I purchased it from a hydroponics shop that was closing. It was $5 for 5 gallons of 89% concentration. I did not notice the
Re: [Homebrew_PCBs] tqfp package with TT?
2004-04-07 by Leon Heller
... From: Stefan Trethan To: Sent: Wednesday, April 07, 2004 10:06 AM Subject: [Homebrew_PCBs] tqfp
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-07 by Stefan Trethan
... nothing for me then.. ST
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-07 by Jeremy Taylor
The biggest problem with phosphoric acid is it s low vapor pressure at room temperature,i.e. when heated it evaporates, vaporizes very readily. (faster than
Re: [Homebrew_PCBs] Phosphoric Acid Etch
2004-04-07 by Stefan Trethan
On Tue, 06 Apr 2004 14:33:38 -0000, dsv1486 ... interesting... would be interesting to compare it to the hydrocloric and
[Homebrew_PCBs] tqfp package with TT?
2004-04-07 by Stefan Trethan
Hi, I bought a few ICs at ebay, very cheap, but some have tqfp case.... the pin to pin spacing is 20mil i believe, it are 100 pins. Do you think this is
Re: Inkjet printing to make circuit stick to substrate
2004-04-06 by rmustakos
Steve I m planning on puttng dry, powdered rosin and solder powder on the board (mixed, but loose) and seeing if just printing ink on it will make it stick
Re: Inkjet printing to make circuit stick to substrate
2004-04-06 by Steve
... There are several methods, but the bottom fill is going to be the easiest. Not normally necessary to tape the air hole shut unless you are leaving it out
Re: Inkjet printing to make circuit stick to substrate
2004-04-06 by rmustakos
I got three or four ml of solder powder and ground rosin in the mail. According to the manufacturer, the rosin is all right for electronics, but that it should
OT Re: Com./Amiga CNC retrofit
2004-04-06 by Steve
And for simpletons like me who ve only programmed in Basic, Ace Basic has been out for many years, and recently Amos Pro has been released. I also just got the
Phosphoric Acid Etch
2004-04-06 by dsv1486
I used some phosphoric acid and 3% hydrogen peroxide to etch some boards. I warmed it the a hot water bath and it produced a green tint to the solution after
Re: [Homebrew_PCBs] ammonium peroxodisulfate
2004-04-06 by Leon Heller
... From: mumin55555 To: Sent: Tuesday, April 06, 2004 11:33 AM Subject: [Homebrew_PCBs] ammonium
ammonium peroxodisulfate
2004-04-06 by mumin55555
hallo! i ordered some 2kg of ammonium persulphate to etch pcb s. what i got is ammonium peroxodisulfate [(NH4)2S2O8)]. is it aslo good for etching??? thanks
OT Re: Com./Amiga CNC retrofit
2004-04-06 by Dave Mucha
I am very sure it can be done. TurboCNC is a DOS program written in in, I think, Pascal. For $30.00 you get the source code. It should not be hard to port the
OT Re: Com./Amiga
2004-04-05 by Steve
I have stacks of Amiga 500, 2000, and a few 1200, 3000, and 4000. They are so well documented and smoothly multitasking, there must be a way to put these
OT Re: Com./Amiga
2004-04-05 by ballendo
Sounds funny to hear of an A4000 called old. Still have my 2500... I remember trying to explain how I was pulling screens down, (to access different apps in
Re: Com./Amiga
2004-04-05 by Steve Greenfield
Best place to ask that is on the list. Jan Rowland made something like that using a Commodore Pet to control it. Do you mean Hard Drive IDE interface? The
Re: Com./Amiga
2004-04-05 by Steve Greenfield
Best place to ask that is on the list. Jan Rowland made something like that using a Commodore Pet to control it. Do you mean Hard Drive IDE interface? The
Re: OT: EU vs US appliances
2004-04-05 by Steve
Try: http://groups.yahoo.com/group/electronics_101 Steve
Re: need some help on plating
2004-04-05 by Dave Mucha
... conductive ... like a ... Yes, I need electrical conductivity. The recesses would wind up with connections to other pins. Dave
Re: 50 mil pitch ribbon cable directly to PCB?
2004-04-05 by Phil
... many hard drives? You d need about 3.5mm of clearance which is more than you wanted but it s far less labor intensive than stripping, tinning, and
Re: [Homebrew_PCBs] Re: HPGL
2004-04-04 by John Greene
Hi Steve, Thanks - I did have it wired up wrong - In case anyone else is interested the HP site at
Re: [Homebrew_PCBs] Re: HPGL
2004-04-04 by Stefan Trethan
... Yea that cable sucks... took me quite some time to notice it is not a standard one... ST
Re: HPGL
2004-04-04 by Steve
... Do you have a cable wired correctly? It won t work with just a standard serial cable. There are docs on HP s website that show the proper way to rewire a
Re: 50 mil pitch ribbon cable directly to PCB?
2004-04-04 by rmustakos
Phill I have not looked for them, but I expect they come just like headers, I ll check my Mill-Max catalog and see if they have any. I checked, and while
Re: [Homebrew_PCBs] 50 mil pitch ribbon cable directly to PCB?
2004-04-04 by Paul Davis
How about using an edge mounted IDC header such as those found on many hard drives? You d need about 3.5mm of clearance which is more than you wanted but it s
Re: need some help on plating
2004-04-04 by rmustakos
Dave Do you need elestrical conductivity to the pad, or is it just for heat transfer? If you need electrical, and the solder is not for mechanical a conection
Re: HPGL
2004-04-04 by Phil
HPGL is the underlying graphics language for lots of HP printers so its happening automatically. If you want tweak the output data, selectprint to file. ...