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Get a 12 volt power supply. If you want to know 'why'... read on. A typical class 2 power supply, which is what a wall-wart type supply is... is unregulated. This means that the voltage coming out of it is not going to remain constant. It will change with line voltage (wall socket voltage)...

Hello all. New here. I ran across this thread and felt I needed to post some helpful information. Sorry for the long post. I am long winded. Computer power supplies are 'switch mode' type power supplies. Wall-warts, like the one pictured in the previous post are 'linear' power...