Control unit for Count-down timer
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I made both of double sided type and single-sided type as the printed board of the control unit. As for you, it makes both types and not having been held. I tried the making of the printed board which used the through-hole in this unit. As for the way of making the double sided printed board, refer to the following.
The making of the Double sided printed board  The type which used the double sided printed board
The type which used the single-sided printed board
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