Re: [Homebrew_PCBs] SMD caps - no marking - why?
2010-03-05 by Stefan Trethan
I ve seen some ceramic chip caps with writing on them, but it s very rare, about as rare as resistors without lettering. They could be laser marked, but I
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Re: SMD caps - no marking - why?
2010-03-05 by sailingto
Is it as simple as that Leon? Can t write on material? I had not thought about that - ceramic is pretty hard. Any other ideas? Thanks for the info Leon, Ken
Re: [Homebrew_PCBs] SMD caps - no marking - why?
2010-03-05 by Leon Heller
... It must be something to do with the ceramic material they are made from, I don t think that it can be written on using a laser. Leon -- Leon Heller G1HSM
SMD caps - no marking - why?
2010-03-05 by sailingto
Subject says it all - most all the SMD chips have ID marking - except for caps, some inductors, and maybe a few others. BUT resistors, transistors, large
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-05 by Paul Symansky
Steve, It s interesting that you say that. Out of the 25+ Epson and HP printers I ve torn down for parts, the vast majority use stepper motors over DC servos.
Re: Re: Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-04 by nisma@gmx.net
Re: Re: Cheap Automated Cutting Machine - Mod for PCB Masks? http://www.flickr.com/photos/50166503@N00/sets/72157600156419851/ The circuit seems really
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-04 by alienrelics
... Many desktop printers use DC servo motors -because- they are cheap. Epson and HP have optical encoder strips, because the X direction is controlled by a DC
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-03 by Paul Symansky
Hi David, Yes, it has a computer interface. Provo Craft distributes certain software to connect to the machine, modify certain patterns and upgrade the
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-02 by drmail377
Hi Paul, So this thing has a computer interface? I didn t pick up on that. My mind just started mentally taking the thing apart and digging into stepper motors
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-02 by Paul Symansky
Hi all, I have a Cricut that I occasionally use for cutting solder paste stencils, and it actually works fairly well. It can cut patterns for SOIC components
Re: [Homebrew_PCBs] Laser engraver using an XMOS XK-1
2010-03-01 by Henry Liu
I tried .5mm (~20mil) lines and it wasn t a problem. Maybe I could go smaller but would need to spend more time focusing and not sure if it would stick. It
Re: [Homebrew_PCBs] Laser engraver using an XMOS XK-1
2010-03-01 by kimvellore@sbcglobal.net
Henry, That sounds interesting, how sharp are the lines and how thin a line size can you go. How do you remove the glass like coating for soldering. If
Re: [Homebrew_PCBs] Laser engraver using an XMOS XK-1
2010-03-01 by Henry Liu
I ve had good luck laser engraving Thermark (www.thermark.com) for a PCB soldermask. It leaves a permanent glass-like surface on the PCB. High powered non
Laser engraver using an XMOS XK-1
2010-03-01 by Leon Heller
I m heavily involved with XMOS chips, and this laser engraver is a nice use for the little XK-1 board:
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-01 by alienrelics
Most importantly, here is the link where it is selling at less than half the list, $85 from JoAnn s:
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-03-01 by drmail377
Link is in the top-post: www.provocraft.com
Re: Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-02-28 by alienrelics
ROFLMAO!!! Actually, it is Cricut . But I can easily see you reading it as Circuit . That would be funny if they had called it the Circuit .
Re: [Homebrew_PCBs] Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-02-28 by Leon Heller
... The £60 HP Deskjet printer I use works very well. I can t see that sort of thing giving anywhere near the same results. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-02-28 by Jack@coats.org
We purchased one for our daughter at Christmas to use to cut out paper and vinyl. I hadn t thought of it for working with solder masks. It is a light duty
Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-02-28 by rocko
How about a link?
Cheap Automated Cutting Machine - Mod for PCB Masks?
2010-02-28 by drmail377
Have a look at these machines (coincidentally) named Circuit and Circuit Expression . The Circuit machine has been on sale recently for around $85 USD. They
Re: Disposing of Etchant.
2010-02-28 by Ben L
... FeCl keeps for a long time. You can add some Baking Soda leave it open til it dries up then seal it up in something and throw it away. You are talking
Re: Disposing of Etchant.
2010-02-27 by Jachin
I would not want the stuff to be around for more than a week. I am working in borrowed lab space, and I don t want to take up too much space. That being
Re: baking paper TT
2010-02-27 by sailingto
OK Folks - ST has a very valid point with the parchment paper. I have done a couple more transfers and the ground plane does NOT get good coverage - I do
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-27 by Stefan Trethan
Yes, bummer, as you put it. Still looks very nice as component legend! ST
Re: baking paper TT
2010-02-27 by sailingto
No I have not tried to etch a board. By prone to problems - what type of problems to you mean? The copper looked very clean... Is there a bit of silicone
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-27 by Stefan Trethan
Did you actually etch that board? For some reason solicone coated paper is far more prone to problems with ground planes and wide traces. I ve given up using
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-27 by Tony Smith
The blue stuff is used by carpenters, woodworking places will have it. A bit odd it handles high temperatures. Kapton tape is what you usually use, it s
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-27 by piers@u-h-p.com
i ve used normal sticky tape and some left over avery labels with no problems PG ... -original message- Subject: Re: [Homebrew_PCBs] Re: baking paper TT
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-27 by Donald H Locker
Many thanks to Ken and Steve. I ll give regular Scotch tape, blue masking and regular masking tapes a whirl! I just don t want to leave any bad schtuff (TM)
Re: baking paper TT
2010-02-27 by alienrelics
There is a black high-temp masking tape I used to buy when I was putting pictures on ceramic mugs. One day I ran out and grabbed a roll of regular masking tape
Re: baking paper TT
2010-02-27 by sailingto
Donald, I bet it was a real pain - as thin as that baking paper is I would be very concerned about trying it without a carrier. I have managed to find this
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-27 by Donald H Locker
What did you use to tape it to the carrier paper? Is there a special high-temp adhesive tape for this? (I did try Reynolds baking paper without carrier once,
Re: baking paper TT
2010-02-27 by sailingto
snow shoes? 4 ft walking stick with 2 inches sticking out? Wayne you live in the WRONG part of the world!! Down here I complain when (if) have frost on the
Re: [Homebrew_PCBs] Re: baking paper TT
2010-02-26 by Wayne
... Not yet. We ve had a bit of snow come down and have been real busy keeping the driveway cleared, and cleared, and cleared. Went to the sat dish to clean
Re: baking paper TT
2010-02-26 by sailingto
Wayne, did you ever try the baking paper? If so, what are your results. I just tried it a few minutes ago and BOY AM I IMPRESSED!! It s better than the
Re: [Homebrew_PCBs] Re: Solderability and Etching
2010-02-26 by Philip Pemberton
... Chemtronics Flux-Off No-Clean Plus . Part number ES896BE. Farnell part number 7922493, though I d bet my bottom dollar DigiKey, Jameco or Mouser stock it
Re: [Homebrew_PCBs] Disposing of Etchant.
2010-02-26 by DJ Delorie
... How long is long periods ? Mine s been sitting on my workbench for two years now, and I have some used FeCl that I got years before that.
Disposing of Etchant.
2010-02-26 by Jachin
I am planning to follow one of recipes for making copper etchant from hydrochloric acid,and was wondering how I should dispose of the used etchant? I know
Re: [Homebrew_PCBs] Re: Need PCB Software with....
2010-02-25 by Leon Heller
... My library isn t well organised, but you should be able to find things like tuning capacitors, inductors, RF transformers and so on. Try using the Part
Re: Need PCB Software with....
2010-02-25 by g6lbq
Thanks for that Leon, I have downloaded a trial version to evaluate and have also joined the Pulsonix PCB group so I could get your symbols etc. Regards Andy
Re: Solderability and Etching
2010-02-25 by bhleavi
... The resist will not prevent being able to solder the board. I don t remove the resist before soldering, I using positive resist. A long time ago I used
Re: Solderability and Etching
2010-02-25 by ikc46118
Sounds like you don t have all the resist removed. Bruce
Re: Solderability and Etching
2010-02-24 by tuck3461
... I ve found the same thing so stopped using it. On small boards, I just hand tin with solder or solder paste. It s not the prettiest but it protects the
Re: [Homebrew_PCBs] Solderability and Etching
2010-02-24 by lists
In article , ... I found it didn t seem to tin easily for some reason but it does seem to
Re: baking paper TT
2010-02-24 by sailingto
... That is a very good article on baking paper - reading that article and from info provided by the group, I have learned what baking paper is. From the
Re: [Homebrew_PCBs] Re: Solderability and Etching
2010-02-24 by Leon Heller
... When I tried TT I found that cellulose paint thinners (xylene) did a good job. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Solderability and Etching
2010-02-24 by Leon Heller
... I think that rubbing alcohol has an oil in it (wintergreen?). That will cause problems. Leon -- Leon Heller G1HSM
Re: [Homebrew_PCBs] Solderability and Etching
2010-02-24 by Leon Heller
... India Pale Ale. 8-) It s actually iso-propyl alcohol. I use the 99% stuff. Leon -- Leon Heller G1HSM
Re: Need PCB Software with....
2010-02-24 by alienrelics
I ve found that parts are simple to make in Diptrace. Make the pattern, then make the schematic symbol and link them. As long as all pads are properly