pad@probitas.cs.utas.edu.au (Paul A Daniels) (06/11/91)
Yet another title says it all posting. Can anyone tell me how to do it. I would also like to find out about methods for mounting suface mount components. Thanks in advance, Paul. ------------------------------------------------------------------------------- pad@probitas.cs.utas.edu.au pad@tasman.cc.utas.edu.au ------------------------------------------------------------------------------- -- Paul A Daniels pad@probitas.cs.utas.edu.au "If I knew what I was doing +61 02 202904 I wouldn't be here" Computer Science Dept Uni of Tasmania
steve@nuchat.sccsi.com (Steve Nuchia) (06/11/91)
In article <pad.676610517@probitas> pad@probitas.cs.utas.edu.au (Paul A Daniels) writes: > Subject: how to make 3+ layered boards? > Yet another title says it all posting. A neat trick for home prototyping is to burn the artwork onto the bottom sides of a bunch of boards and stack them one at a time onto wire-wrap sockets. That way you can make as many layers as you need and don't need any plated holes. Use bits of wire or something to make your vias work. For production you have to pay someone who knows how to do it. Even if you had all the materials, it would still be just about impossible without the equipment. Do the artwork on cad and give a floppy to the board shop. It's the only way to fly. For small quantities, like less than 6, you might be happier doing two or even one sided boards at home and using wire-wrap and/or jumper wires to handle whatever you weren't able to route. >Can anyone tell me how to do it. I would also like to find out about methods >for mounting suface mount components. You can always use through-hole sockets for PLCCs. Gull-wing type parts can be soldered by hand if you are patient and have the right tip. I've also heard that you can do reflow soldering in an ordinary home oven. Tin the leads and the pads, find some way to hold the components still (maybe tack-solder some leads down?) and stick it in a preheated oven (say, 450 F) for a few minutes. Time and temp will have to be calibrated, so having a bunch of junk parts and borads to play with would help. -- Steve Nuchia South Coast Computing Services (713) 964-2462 "Innocence is a splendid thing, only it has the misfortune not to keep very well and to be easily misled." --- Immanuel Kant, Groundwork of the Metaphysic of Morals
henry@zoo.toronto.edu (Henry Spencer) (06/18/91)
In article <1991Jun11.125843.105@nuchat.sccsi.com> steve@nuchat.sccsi.com (Steve Nuchia) writes: >> Subject: how to make 3+ layered boards? > >For production you have to pay someone who knows how to do it. Even if you >had all the materials, it would still be just about impossible without >the equipment... It *is* possible -- I know people who've done it -- but without a fair bit of moderately costly equipment, you're not going to consistently get quality boards out of it. Dependably getting high-quality plated-through holes requires precise control of things like solution chemistry and temperature, plus a substantial debugging process to get the parameters set right. This essentially amounts to setting yourself up as a board production shop, at considerable cost. Adding copper is a lot harder than subtracting it; there isn't any basement-bench way of doing it that reliably gives good results. If you want something that will give you a good board the first time every time, and don't want to spend a lot of money and effort on it, you need to pay someone who *has* spent the money and effort. -- "We're thinking about upgrading from | Henry Spencer @ U of Toronto Zoology SunOS 4.1.1 to SunOS 3.5." | henry@zoo.toronto.edu utzoo!henry