12, 9 and 5 Volt Power Supply

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This simple power supply provides 3 voltages to the electronic experimenter.
The transformer is of the type you will find as part of many home doorbells.
The transformer provides 18 Volts at 300 mA.
All other parts are still available over the counter at your favorite electronic supply house (except Radio Shack).
Mouser Electronics has them and they can be found in junk televisions that had picture tubes.

As always if you have an idea for something interesting let me know in the comments and I'll see if I can help you put something cool together. Just wait and see what I have coming up!