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It's great for that DC adapter you found with the too-short cable. Plug this 3' extension in, and you're good to go.
Power that breadboard simply with this DC barrel jack.
It's a pain to solder up barrel jacks, so these screw-terminal based versions are very popular for repurposing DC power supplies to other applications!
A 2.1mm Female barrel jack with 10" of red and black insulated wire attached.
24VDC at 17A, ideal for powering up a 3D printer with hot-plate.
This power supply is a brute! It's rated to supply 12VDC at 5Amps and is perfect for powering 12V LED strips, usually up to 5 meters!
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