HerbertMunch said:SPDCHK, what type of paper do you use?
HerbertMunch said:Anyway, has anyone used the pre coated ones before?
Hero999 said:A nice board.
The only problem is that there isn't enough clearance between the mains and the DC side. For safety reasons you should allow at least 5mm (I can't remember the exact figure, I'll have to check the IEE regulations). This is because there could be 2kV spikes on the mains and any moisture/impurities on the board could cause it to track over to the DC side.
I strongly recommend you cover the mains traces with a protective lacquer or conformal coating which will provide an additional layer of insulation.
If the entire project is encased in a plastic insulated box and no external circuits are going to be connected to the the DC then there's no need to bother but otherwise I wouldn't risk it.
Another way of providing similar protection would be to bond the negative rail of the DC supply to the protective earth conductor.
SPDCHK said:Thanks for the advice. I followed some standard where I read something about that 1mm is enough protection for about a 1000V. To be quite honest I usually don't fill the unused parts of the PCB. I tried it here and came out quite nice, BUT I seem to have violated some safety rules in the process.
pitronix said:I have been doing small quantities PCB manifacturing for some time and again I have to advice people to try using silk screening with PVC colors. It is easy enough and pays out in a long run much more then all other methods. You just print as many pices as you need and etch it with H202 and HCl solution. For using Positiv 20 and another sprays you need lot of practice but it can be done if you realy take some time to finde right way to do it
pitronix said:I have been doing small quantities PCB manifacturing for some time and again I have to advice people to try using silk screening with PVC colors. It is easy enough and pays out in a long run much more then all other methods. You just print as many pices as you need and etch it with H202 and HCl solution. For using Positiv 20 and another sprays you need lot of practice but it can be done if you realy take some time to finde right way to do it
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?