I try to make a simple +/- 12V with a stripboard and an LM7812CV and LM7912. I have a 12-0-12 transformer in input. I m getting 17VDC output on the 2 rails and 10-12V between the 2 rails. I m beginner in electronics and this my first "serious" stripboard project but I cant find where is my mistake, could somebody see what I have done wrong or how to troubleshoot this board ? I have attached pictures of the board and a zip with higher resolution pictures.
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