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Adafruit sells a single one of EITHER male or female for $2. $6 for 10 is far more reasonable, and these are great. I like that I can just wire a male to female and then be able to easily meter any electrical connection from any common barrel jack adapter to ensure the voltage is good. My 5V adapter outputs 5.25V, my 18.5V outputs 18.9V, and I also tested a 24V adapter at 24.5V, but several 12V adapters appear to produce closer to 11.8V.
I plan to use one of these as a charging port in a speaker mod I made that powers a previously wall-socket powered 30W RMS speaker set through a 14.4V series config of NIMH batteries in place of the 12-15V from a transformer it was previously getting. I have another supplying easily disconnected power to 2m of Neopixels (which the 5V adapter is for) and plan to make them sound reactive. I can then easily switch between wall powered or portable with those as I have a DC-DC Booster and 5000mAh LiPo.
Some of the connectors were not able to pass through the 5 volts., I used a multimeter and while on one end it was receiving straight 5 volts, the other end was passing through only 1.03 volts... weird.... so, only a couple of pairs I was able to use... the others were just a waste.
These were a nice find for the project I am doing. They are solidly made, and all 10 of them were working perfectly. Easy to work with because of the screws. great solution for when you need small dc barrel jacks.
Not bad for the price, but one of the plugs I received had a defective screw terminal. Even with the screw loosened all the way, the retainer was "stuck down" and there was no way to insert a wire.
Works perfectly! I wanted to supply power to my servos for an Arduino project and wanted to get power from a 6V power supply. I plug the supply into the female adapters and from there to my breadboard using jumper cables.
Exceed my expectation, and nice price. Screw clamping on wires and hold great. I have 12V DC - 6amp running on these connectors, with no heat or connection problems.
The plus connection in the middle of male connector extends beyond the connector and usually shorts against the ground connection on the female connector before it is plugged in. If you are anywhere near sensitive components this will fry them. These are going in the trash.