Homebrew PCBs

Hi David,
 
Forty years ago I used homebrew photo resist based on chemicals used for silk screen printing. It was very cheep and worked just fine. You don’t need UV light and the “developer” is  regular water. This technology is worth if you have to manufacture many relatively large boards (15x20cm) at home.
 
The only problem was that the emulsions and the ferric chloride  must be kept in narrow tolerances like temperature and concentration. 
 
Unfortunately, I don’t have my archive records on hand to give you those recipes. 
 
Regards,
 
Vesko, AB8PG / LZ2WJ

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