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Making of
the Double sided printed board

I explain the making process of the double sided printed board on these pages.
The circuit to use is "Control unit" to be introducing with "Count-down timer".

As the printed board, I use the positive exposure printed board for the double sided.
I make the thing for the double sided about the mask pattern, too.
When making the through-hole, the implement for the through-hole making becomes necessary.
The other materials, the implement are the same as the one which makes the single-sided printed board.

Point of the making
    The point which is different from the single-sided printed board making.