[Dead Parrot]

Here is a hasty circuit that should be somewhat simpler and cheaper. The 3 zeners in the top will limit the voltage to about 10v. Size the resistor to limit the current so the zeners are not dissipating too much power. This is important since they could be on for hours. The one on the bottom is set for 12v. Again, size that resistor so not much flows through the zener. The zeners cost about 5 cents each with a minimum order of 60.