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9V to Barrel Jack Adapter
Price: $3.39
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Sparkfun Item #: PRT-09518 -

"This simple cable has so many uses! Plug the 9 volt battery clip onto a standard 9V battery and connect the other end to anything with a 5.5x2.1mm, center-positive barrel jack. Use this cable to battery-power any device that needs 9V and has an on-board barrel jack - it works great for Arduinos, development boards, evaluation boards, and more!" ...

Barrel Jack Adapter - USB to 5.5mm
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Price: $3.39
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Sparkfun Item #: TOL-08639 -

"This is a simple cable that adapts from a USB port to a 5.5x2.1mm barrel connector, center positive. This cable allows the user to use a USB port on a computer, laptop, or on our cigarette power supply to provide our development boards with 5V. The USB specification limits current consumption to a max of 500mA from a USB port but this is more than enough to run a simple development board. Cable length is 3 feet."

Barrel Jack Extension Cable - M-F (3 ft)
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Price: $2.01
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Availability: Stocked
Sparkfun Item #: COM-11706 -

"Do you fear that your power may not be “far reaching” enough? How would another 3' work for you? Okay, so it doesn’t sound very dramatic, but sometimes an extra 3' of power cable is exactly what your project needs. Don’t hack apart a nice clean barrel jack connection just because it won’t reach, this male-to-female barrel jack extension cable will make the reach. This cable is terminated with 5.5x2.1mm barrel connectors, one male and one female, and fits most of...

Barrel Jack Extension Cable - M-F (6 ft)
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Price: $2.24
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Sparkfun Item #: COM-11707 -

"Do you fear that your power may not be “far reaching” enough? How would another 6' work for you? Okay, so it doesn’t sound very dramatic, but sometimes an extra 6' of power cable is exactly what your project needs. Don’t hack apart a nice clean barrel jack connection just because it won’t reach, this male-to-female barrel jack extension cable will make the reach. This cable is terminated with 5.5x2.1mm barrel connectors, one male and one female, and fits most of...

Barrel Jack Power Switch - M-F (3")
Price: $2.88
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Sparkfun Item #: COM-11705 -

"We use barrel jacks a lot around here and sometimes we need to pop a switch into the mix. That usually means hacking up a perfectly good barrel jack extension cable, but the whole point of using the barrel jacks was so that we wouldn’t have to hack things apart… Well, we found a solution: The Barrel Jack Power Switch. Okay, it’s nothing fancy but it is really useful. Plug your power supply into one end and the other into your project and, just like that, you’ve got a...

Barrel Jack to 2-pin JST
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Price: $3.40
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Sparkfun Item #: TOL-08734 -

"Two pin JST connector to a 2.1x 5.5mm barrel jack, 6.25 inch long jumper cable. We use this cable to adapt from a wall power supply to a relatively small, SMD JST connector. We found that many of the SMD connectors used for battery charging were too large or were not capable of through-putting the current we wanted for faster charging. This setup, with a SMD JST connector and wall power supply, can handle up to 2A!"

DC Barrel Jack Adapter - Female
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Price: $3.39
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Sparkfun Item #: PRT-10288 -

"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."

DC Barrel Jack Adapter - Male
Price: $3.39
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Sparkfun Item #: PRT-10287 -

"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 male barrel jack. If you need to connect bare wires to a barrel jack on an Arduino or a development board, this might be the simple solution."

DC Barrel Jack Plug - Female
Price: $1.09
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Sparkfun Item #: PRT-13126 -

"This female barrel jack plug is great for adding a common connector to the end of wires. This jack is compatible with 5.5x2.1mm barrel connectors. The outer shell unscrews to reveal solder terminals and a crimp strain relief. The outer shell has strain relief as well."

DC Barrel Jack Plug - Male
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Price: $1.09
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Sparkfun Item #: PRT-11476 -

"This barrel jack plug is great for adding a common connector to the end of our wires. This jack is compatible with 5.5mm barrel jacks that have a 2.1mm center pole diameter. The outer shell unscrews to reveal solder terminals and a crimp strain relief. The outer shell has strain relief as well. Documents: Product Video "

Mean Well LED Switching Power Supply - 5VDC, 5A
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Price: $21.28
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Sparkfun Item #: TOL-14601 -

"This is a 25W single output switching power supply from Mean Well that has been specifically designed to work with LED applications. This power supply is extremely reliable and able to output 5VDC at up to 5A. We’ve been testing this power supply for quite some time and can definitely attest to its durability with its IP42, fully isolated plastic casing, short circuit, overload, and over voltage protections. The power supply includes wire pairs for the input (brown and blue) and output...

Power Supply - 30W, 5V
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Price: $32.25
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Sparkfun Item #: TOL-14932 -

"This power supply is a highly reliable desktop style single-output green adapter. It is designed with a low/no load power consumption (less than 0.075W) and an average operating efficiency up to 92%!. This adapter is able to better fulfill energy saving and carbon reduction, either in no load, or operating mode and meet energy efficiency regulation level VI. This is a class I power unit, equipped with an AC inlet and adopting the input range from 90VAC to 264VAC Features: 30 W output 5V...

Power Supply - 54W, 9V
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Price: $32.25
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Sparkfun Item #: TOL-14933 -

"This power supply is a highly reliable desktop style single-output green adapter. It is designed with a low/no load power consumption (less than 0.075W) and an average operating efficiency up to 92%!. This power supply is able to better fulfill energy saving and carbon reduction, either in no load, or operating mode and meet energy efficiency regulation level VI. This is a class I power unit, equipped with an AC inlet and adopting the input range from 90VAC to 264VAC Features: 30 W output 5V...

Power Supply - 60W, 12V
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Price: $32.25
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Sparkfun Item #: TOL-14934 -

"This power supply is a highly reliable desktop style single-output green adapter. It is designed with a low/no load power consumption (less than 0.075W) and an average operating efficiency up to 92%!. This power supply is able to better fulfill energy saving and carbon reduction, either in no load, or operating mode and meet energy efficiency regulation level VI. This is a class I power unit, equipped with an AC inlet and adopting the input range from 90VAC to 264VAC Features: 60 W output 12V...

Power Supply - Multi-Range DC 42V, 20A
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Price: $850.98
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Sparkfun Item #: TOL-14927 -

"This Multi-Range DC Power Supply from B&K Precision is capable of replacing several power supplies on your work bench by offering extended operating areas. Unlike conventional supplies with fixed output ratings, this power supply automatically recalculates voltage and current limits for each setting, providing 320W output power between zero to 42V and zero to 20A. This power supply is suitable for a wide range of applications requiring high current including production testing,...

Power Supply - Multi-Range DC 84V, 10A
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Price: $850.98
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Sparkfun Item #: TOL-14926 -

"This Multi-Range DC Power Supply from B&K Precision is capable of replacing several power supplies on your work bench by offering extended operating areas. Unlike conventional supplies with fixed output ratings, this power supply automatically recalculates voltage and current limits for each setting, providing 320W output power between zero to 84V and zero to 10A. This power supply is suitable for a wide range of applications requiring high current including production testing,...

Powerocks Magicstick 2800mAh - Silver
Retail: $39.93
Price: $10.01
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MK-Misc Item #: PRSilver -

Magicstick 2800mAh - Silver Rechargeable, Portable and Lightweight  This extended battery is small enough to easily fit in a purse, briefcase, backpack...even in the palm of your hand. This lightweight but powerful battery is perfect for work, vacation and everyday on-the-go. It has a modern slim, sleek, and stylish design. Its compact design makes it convenient to carry in your pocket or purse. You could even leave it plugged in to your phone. Micro USB cable and velvet bag are included....

SparkFun DC/DC Converter Breakout
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Price: $37.87
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Sparkfun Item #: BOB-09370 -

"This is a breakout board for our non-isolated, 6A DC-to-DC Converter Module. The module can convert any DC voltage between 4.5-14VDC to a selectable voltage between 0.59 and 5.5VDC. To set the output voltage to the desired level, a resistor must be added between the Trim and GND pins. For example, to set the module to output 5V use a 1.34kΩ resistor, or to get 3.3V use a 2.182kΩ. See table 1 in the module’s datasheet for more resistor values. The ON/OFF pin on the board can be...

Switching Power Supply - DC 20V, 5A
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Price: $355.63
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Sparkfun Item #: TOL-14929 -

"This Switching DC Power Supply is a compact 100 Watt power supply delivering 1-20V and 0-5A from its three output terminals. These DC power supplies feature constant current or constant voltage modes with automatic crossover making them ideal for troubleshooting circuit boards or devices which require two or three different input voltage ranges. Typical applications for this compact power supply include educational labs, technical schools, internal training facilities, and hobbyists....

Switching Power Supply - DC 36V, 3A
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Price: $262.02
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Sparkfun Item #: TOL-14928 -

"This Switching DC Power Supply from B&K Precision is a compact 108 Watt power supply delivering 1-36V and 0-3A from its main isolated output. A unique feature of the this power supply is the USB charging port located on the front panel allowing you to charge a cell phone or MP3 player. Clean power and quiet operation make this power supply ideal for any bench in labs, workshops, and schools where bench space is limited. Features: Input Voltage:100VAC to 120VAC Number of Outputs: 1...