This Instructable will show you how to use a DC adapter instead of batteries. By using a DC power supply, you won't need any more batteries which makes the device cheaper to run. The battery imitation here made of bamboo.
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Step 1: Cost Comparison of Power Sources
Based on the tables, electricity gives you more bang for your buck than alkaline batteries. AA batteries cost $330 per kWh and electricity costs $0.10 per kWh, which is more than 3000 times as much!
Step 2: Materials and Tools
Bamboo stake (available at garden centers)
Two pieces of bare copper wire
Markers to label the polarity
Bamboo stake (quantity depends on the number of batteries you are replacing)
One piece of bare copper wire per conductor piece
Hot glue gun
Step 3: Bamboo "Batteries"
The bamboo stakes in my garden perfectly fit AA battery holders. For the project, you will need to make one "battery" piece and at least one conductor piece. They'll be slightly shorter than the batteries, and the ends filed.
To make the battery piece, cut a hole in the center length of the bamboo and arrange the wires, as shown in picture 2. Loop the ends of the wires. You can clip the connector and save it for other projects. Hot glue can be used to keep the wires from moving. Never let them touch!
The conducting pieces may or may not be needed at all. They take the place of the other batteries. To make the conducting pieces, put the copper wires through the ends of each piece and loop the ends to keep them from falling out. Make sure their wires don't touch their neighbour's. If there is poor contact, you may fill the ends with aluminum foil
If you want, you can also make a USB Bamboo "Battery" by using a USB cable instead of an adapter.
Always measure the voltage before using it, make sure the adapter doesn't overheat.
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