Hi all
Can anyone suggest a pcb manufacter that can do 2 sided pcb
and only 1 pcb not much more.
I make my own PCBs. They are not as good as what would come out of a professional fabrication setup - however, from laptop design to the board ready to be assembled I can do it in two-three hours, and most of the time is waiting for the flux spray to dry (I usually leave it dry overnight). Considering I make so many mistakes it takes multiple "versions" of the PCB to get it right, it is vital to be able to have the PCB done very quickly, even if it lacks "professional" quality, eg silk screen.
Once I am very , very happy with a PCB I might decide to send it done professionally. But so far my own PCBs are just great.
You need a laser printer, 2-3 chemicals in powder form, a few plastic tubs, something to cut PCBs with (I use an old circular saw tile cutter), and an UV exposure box. It is an initial investment in chemicals and the UV box maybe, but well worth it for being able to make PCBs on demand in a couple of hours. Ah you also need a Dremel and a stand for it to drill your board.
Not being able to make PCBs on the fly is a major limitation.
The process is like this:
1) produce the artwork on transparent paper on the laser printer.
2) cut the PCB to size (5 mins maybe)
3) expose the PCB in the UV box (4 mins per side)
4) dip the PCB into the developer chemical and shake rigorously (around 60 seconds)
5) dip the PCB into hot etchant (ammonium persulphate) around 60 minutes (keep it hot by using a tub of hot water under it)
6) drill the PCB using dremel (about 30 mins depending on number of holes)
7) dip the PCB into photo resist stripper (15 seconds)
spray PCB with flux spray and let it dry (overnight usually)
If you skip the last step you can be working on the PCB in a couple of hours.