01-07-2025, 06:59 AM
(This post was last modified: 01-07-2025, 06:59 AM by ppppenguin.)
While HCl may attack whatever glues the copper to the board and may attack what you're using as a resist it certainly doesn't dissolve copper.
What did people use for resist back then? I think I tried the special (Dalo?) pens, sticky backed plastic cut out with a craft knife.
Later on I realised that DIY PCBs with those methods was too much trouble. I used a lot of matrix board (like Veroboard without copper strips). This is the prototype PALl/NTSC encoder that was my first professional freelance design in 1987. I think I still have it and it probably still works. The main purpose of that design was to give a PAL output from a genlocked BBC Micro. A production board, on a PCB, is in service at the Dulwich museum, encoding the output of the COW (Computer Originated World)
What did people use for resist back then? I think I tried the special (Dalo?) pens, sticky backed plastic cut out with a craft knife.
Later on I realised that DIY PCBs with those methods was too much trouble. I used a lot of matrix board (like Veroboard without copper strips). This is the prototype PALl/NTSC encoder that was my first professional freelance design in 1987. I think I still have it and it probably still works. The main purpose of that design was to give a PAL output from a genlocked BBC Micro. A production board, on a PCB, is in service at the Dulwich museum, encoding the output of the COW (Computer Originated World)
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
