The boards with a protective sheet.
The fitted boards with a protective sheet.
The circuit boards and the transparency before exposure to UV light.
The two-sided model for the board
Exposure to UV light
Exposure to UV light
The boards have to be developed in a caustic soda bath.
The board after developing
Etch in a ferric chloride bath.
After etching
The bores have to be drilled.
After tin coating
A detail after tin coating.
finished circuit board
The finished circuit board works 🙂