rocket8080
New Member
Hi Im newbie at this stuff and need help. Ive been building a aftercooler for my computer using a schematic and veroboard layout downloaded from the net. It uses a 5v standby supply (1A) and a 12v switched supply (0.5A?). The idea is when I power off the computer the timing cycle starts and clicks in a relay to change the fans over from the motherboard to a 9v battery for 4-5 minutes. At first it didn't work as it was using a 5v relay so I changed it to a 3v as the ne556 can only out put 3.3v using a 5v supply. All was working well until today when it just stopped working and I cant figure out why. Any help would be great as rapid hair loss is starting to occur! Here is the schematic and vero layout. I noticed aswell there are a few difference with the two, when building it though I followed the vero layout.