Do you have any old wall adapters laying around from old routers, laptops, radios, or other devices that you'd like to use for something?
This project plan shows you how to build an adjustable power supply that uses any old wall adapter as an input. You can adjust the output voltage from 2.6V up to 25V (depending on your input).
This means you can set the output voltage to for example 9V and use it as a battery replacement for experiments.
And since you don't have to deal with mains power directly, it's a safe power supply design to build.
For more advanced builders, you could easily remove the need for a wall adapter by adding a transformer and bridge rectifier. Only do this if you are aware of and willing to take the risks of working with mains power.
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