Hi, my wife is building a diorama model if Bethlehem for our church Christmas services, and I have just put some lighting in for her. I am no electrician, but I thought I understood the basics of DC circuits. I used 25 'grain of wheat bulbs', each rated at 12v / 80mA, which I wired in parallel to a 12v / 2A regulated power supply (mains transformer). 25 x 80mA = 2A, so I thought the load would be OK. It worked fine for a few hours (switching on and off several times as I tested various sections). Then some time after the lighting was completed, it suddenly it stopped working and we weren't doing anything to the electrics at the time. The bulbs are still working and the circuit is still intact - I tested the circuit using a 9v battery and the lamps still lit, but putting a meter across the power supply output to check the output DC voltage, it only registered about 0.1v. I assume this means that the power supply has failed. Does this suggest a faulty power supply or could there be anything in the way I have connected the bulbs that could have caused it to fail? I ran a wire (speaker wire) from each bulb to 2 terminal blocks, connected the individual terminals in each block together and then connected the terminal blocks to the power supply. The average length of each wire is probably about half a metre. Could the resistance in the wires have increased the load enough to blow the power supply? Thanks in anticipation of any help anyone can give me.