I feel like something is wrong on the soldered board do you need photos ? I gave schematic on the above post.
When i connect the breadboard version to the computer using USB / 5v rail from the UNO board, it doesnt over heat.
Over heating happens ONLY when we use a wall wart (+12v) connected to my own voltage regulator which uses 7805 with 470uF and a 100uF capacitors ( with 2 104 ceramic capacitors )
could this be due to the voltage regulator?
Also note my ds1307 dont seem to be frying because when i use the breadboard version they are working.. I ve used like 3 of them haha hopefuly they are not all dead yet.