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If you have questions, watch the video, it has extra detail as well.
Safety first
When it comes to safety, it pays to double check your work and error on the side of caution. I can give some guidance on how to choose equipment safe for your application, but it doesn’t mean it is safe for your person if you get in the middle of your electric circuit. if you have concerns about doing this on your own particular project, ask for help.
Some things to keep in mind for safety:
Voltage does not kill, current kills, but voltage is required to push the current along. So, while a 5 Volt 1 amp power supply may be reasonably safe to work with, a 100 volt .1amp is potentially lethal if it ‘bites’ you in the wrong spot. Ask for advice if you do not know. At all times, practice safety.
Batteries/power supplies have specific direction/polarity (positive or negative) that the moves the current along. If you wire your circuit backwards, the current will attempt to flow backwards through your device and could damage it. Check the polarity of your batteries and power supply to ensure they match. There will be more on this in a later step.
Before replacing batteries with a power supply, consider where the device or toy is used. Will it be sitting on a desk or near the bathtub? Would your kids put it in the bathtub? Will it be a shocking experience for them if they do?
The problem:
In general, batteries make my life a little more mobile and less tangled. Sometimes however, there are certain devices that I wish came with a plug. Most recently my kids got an awesome night-time toy that projects stars, the moon, galaxies, etc on the ceiling. The problem is the toy is battery operated only and there’s no automatic shutoff so when kids use it like a night-light it’s dead in a few days. I don’t like buying or replacing batteries. (because I’m a cheapskate).
This toy just sits on the desk, so it’s a good candidate to modify to accept a DC power supply instead of batteries. This idea is not well suited to something like an R.C. Car, but in a pinch, you can use it on the remote control for your TV.
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