This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive female barrel jack. If you have a power supply with a barrel jack and want to plug it into a breadboard, this might be the simple solution. Please be aware that the max current for this adapter is 10A. https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2011-05-19 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2016-11-25 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2016-11-28 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2016-11-29 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2016-12-09 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2016-12-13 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2017-11-24 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2017-11-28 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2018-05-05 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2018-11-21 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2018-11-27 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2022-02-21 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2025-04-12 https://elecena.pl/product/1681445/dc-barrel-jack-adapter-female 2025-04-14