Sparkfun

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US$7.81
So much power and light from such a small package. This 3W per channel, Triple Output High Power RGB LED is sure to shed a lot of light on any project you add it to. This LED acts as any other LED except they require much more power while delivering a light as intense of a thousand suns going super nova (this is an exaggeration but you know what we mean)! Please be aware that with all three LEDs (9W total output), you will need additional heat sinking.
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US$7.81
This is an extremely tiny and light weight battery based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 110mAh.  
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US$7.70
Each cable has a female RJ45 on one side which is adapted to a male RJ45 and 5.5x2.1mm barrel jack connector on the other side. The 'injector' cable has a female barrel jack connector and the 'splitter' cable has a male barrel jack.
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US$7.69
The Ethernet Kit for Teensy 4.1 from PJRC includes an Ethernet MagJack connector, a bare circuit board, one ribbon cable, two headers, and a capacitor. As this is a kit that require assembly, some beginner-level soldering is required.
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US$7.62

This is a 1.75 inch communication cable that connects the EM406 and the EM401.

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US$7.62
This is 12 meters of smooth conductive thread spun from stainless steel fiber and wound on a plastic bobbin. Use it to sew up all of your e-textile projects. This small bobbin is a great way to get into wearable electronics without the upfront cost of buying an entire spool of thread. Close to 40 feet of thread is enough to get a simple design stitched onto your shirt, backpack or hat.
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US$7.53
This is a basic SMA (Sub-Miniature A) male to female connector cable. Each cable is 25cm (9.8") long and has a 50Ω impedance that can handle frequencies up to 17 GHz. 
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US$7.52
This sensor will output 0.5V at 0 degrees C, 0.75V at 25 C, and 10mV per degree C. Doing an analog to digital conversion on the signal line will allow you to establish the local ambient temperature.
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US$7.43
Even though it's as small as some of the LilyPad sensors, this board actually has an ATtiny microcontroller on it so it's actually pretty smart! Simply sew on 4 LEDs and connect a battery and the LEDs will twinkle-fade (a lot like fireflies... or lightning bugs, if that's what you call them).
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US$7.43
The MCP4725 is an I2C controlled Digital-to-Analog converter (DAC). A DAC allows you to send analog signal, such as a sine wave, from a digital source, such as the I2C interface on the Arduino microcontroller.
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US$7.43
This is a breakout PTH soldering kit for for the RFP30N06LE N-Channel MOSFET. This kit is extremely simple to assemble with only 10 pins to solder.
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US$7.43
The SparkFun Fuse Breakout Kit comes with everything you need to assembly & use a glass capsule, inline fuse (ferrule type) for your project. The simple breakout design allows for a barrel jack and the option for a screw terminal to be used for (VIN) power input and a second screw terminal used for VOUT. Any 5mm x 20mm glass capsule fuse can be used with this kit depending on your project needs but we have been sure to include a 250VAC, 500mA one to get you started.
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US$7.33
This is a wireless transmitter to work with our 434MHz receiver. They can easily fit into a breadboard and work well with microcontrollers to create a very simple wireless data link.
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US$7.23
These come in a variety of sizes and this is a pack of 10 small storage cubes that can be individually snapped apart and reattached. Of course they're compatible with all other sizes of modular storage box so you can build custom panels of storage compartments. Outside: 25x30x22mm. Inside: ≈18x17.5x18mm.
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US$7.23
These come in a variety of sizes and this is a pack of 4 medium storage cubes that can be individually snapped apart and reattached. Of course they're compatible with all other sizes of modular storage box so you can build custom panels of storage compartments. Outside: 75x30x22mm. Inside: ≈67x17.5x18mm.
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US$7.23
With this USB-C breakout, you will be able to incorporate a vertical USB-C connector into your projects without needing to solder each tiny SMD pad. The vertical orientation of the USB-C connector also makes it convenient for panel mounts in projects.
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US$7.14
This is a breakout board for the TEMT6000 Ambient Light Sensor. Only what you need, nothing you don't. Sensor acts like a transistor - the greater the incoming light, the higher the analog voltage on the signal pin.
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US$7.14
This is a simple board that breaks out a female USB type A connector's VCC, GND, D- and D+ pins to a 0.1" pitch header. If you want to add a USB to your project, but don't want to put up with soldering tiny connectors, this is the board for you.
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US$7.55 US$6.99
This is a small board that connects to the Raspberry Pi’s 26-pin GPIO connector, and breaks the pins out to breadboard-friendly arrangement and spacing, and even adds a couple of decoupling capacitors on the power supply lines.
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US$6.93
This is a small PCB that adapts the standard Microchip 6-Pin RJ11 connector to the Olimex 6-Pin .1" Molex Connector.
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US$6.93
This is a simple breakout board that uses a vertical SMD connector for the EM401 or EM406 GPS module cables.
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US$6.93
Cable interfaces UFL RF connectors to RP-SMA antennas. Use it to attach any standard RP-SMA 2.4GHz antenna to the DPAC 802.11 modules. Dimensions: 4" Length.
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US$6.93
This is a 4" connector cable that interfaces U.FL RF connectors to regular SMA connections.
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US$6.93
Each LED and button is brought out to the side connectors. The connectors are soldered to the back side of the PCB. We recommend trimming the connector leads on the button side as short as possible to reduce the deflection of the pad.
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US$6.93
These LEDs provide optimized light quality and efficiency to address a number of project needs, including LED illumination.
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US$6.93
These LEDs can be blindingly bright and have a max forward current of 1A! This LED has a typical forward voltage of 3VDC (2.55V to 3.99V range).
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US$6.93

This small matrix has both bright-red and bright-green LEDs built into one common cathode housing.

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US$6.93
This tape is a fantastic insulator, like electrical tape, but it can withstand temperatures as high as 258°C (496°F). It also provides good resistance to corrosion and the silicone adhesive holds tight throughout the tape's rated temperature range.
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US$6.93
Each pack includes 25 tiny 0603 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices. 
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US$6.93
These are the same jumper wires that come with the SparkFun Inventor's Kit, they're less rugged than the premium jumper wires but they're great for bread-boarding, they're less expensive and we sell them in packs of 30!
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US$6.93
Ribbon cable is really helpful in situations where you need to make a lot of connections without a big mess of wires. Nothing makes a project look more finished than a nice clean wiring harness.
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US$6.93
This is an interface cable for the Bus Pirate, designed to connect to its 2x5 I/O header. The cable's connector is composed of two rows of five 0.1" spaced pins; it's also polarized, as is the mating connector on-board the Bus Pirate, so you can only connect the cable in one direction. T
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US$6.93
Yes you read that correctly - 10Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. Combine two in series for 5F/5V. Do not over voltage or reverse polarize these capacitors.
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US$6.93
Eeach pack includes 25 tiny blue 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices.
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US$6.93
It has 2 power buses, 30 columns, and 10 rows - a total of 400 tie in points. All pins are spaced by a standard 0.1". The two sets of five rows are separated by about 0.3", perfect for straddling a DIP package over. The board accepts wire sizes in the range of 29-20AWG. Dimensions: 3.29 x 2.15 x 0.33" (83.5 x 54.5 x 8.5mm).
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US$6.93
This is 12AWG stranded red wire with a flexible silicone jacket. This wire is perfect for soldering and connecting any project in which you need a durable, super flexible wire.
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US$6.93
The SparkFun Photon Wearable Shield makes it easy to add the WiFi enabled Photon to any wearables project. Each pin on the Photon is broken out into large sewing pins. Use conductive thread to make your next wearables projects. The large pins are also great for using conductive paint to create any project that needs WiFi.
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US$6.85

This is a 12-step rotary encoder with a nice 'clicking' feel. It's breadboard friendly, and has a pretty handy select switch (by pushing in on the knob). The encoder is different from a potentiometer in that an encoder has full rotation without limits. 

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US$6.85

These DC powered heating pads are perfect for near-body heating applications. They get warm to the touch but not too hot. Simply apply 5VDC to the wire leads and within minutes, the pad will begin to warm up.

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US$6.85
The Molex GNSS Flex antenna is a great option for basic GNSS applications and will work with any of our GNSS boards equipped with a U.FL at a fraction of the cost of many of its big brothers. This antenna supports GPS, Galileo, BeiDou, and GLONASS in three different frequency bands (1561 +/-3MHz, 1575 +/-3MHz, 1602 +/-3MHz).
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US$6.78
S-FF-M4X30-R, M4X30mm Round Threaded Female-Female Aluminum Standoff/Spacer Standoffs manufactured from aluminum are durable and corrosion resistant and...
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US$6.65

This is a package of ten 12 inch single female to female jumper wire set good for prototyping wire connection.

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US$6.65

This is a package of ten 12 inch single female to male jumper wire set good for prototyping wire connection. Use these to jumper from any male or female header on any board.

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US$6.65

This is a package of ten 12 inch single male to male jumper wire set good for prototyping wire connection.

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US$6.65
The TXB0104 is a 4-bit bidirectional voltage-level translator with automatic direction sensing. This 4-bit noninverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA.
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US$6.65
This is an extremely tiny and light weight battery based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 40mAh. This may sound like not so much power, but the cell is really tiny… like, about half an inch square!
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US$6.52
This is a breakout for the SOIC version of the 74HC595 shift register IC. Clock in data and latch it to free up IO pins on your micro. All pins from the IC are broken out to standard 0.1" spaced headers.
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US$6.52
This is a breakout board for the WS2812B RGB LED. The WS2812B is actually an RGB LED with a WS2811 built right into the LED! All the necessary pins are broken out to 0.1" spaced headers for easy bread-boarding.
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US$6.52
The LilyPad Reed Switch is a simple breakout for a reed switch that will make it easy to use in e-textiles circuits in exactly the same manner that you can currently use the LilyPad Button and Switch. In order to make it more durable for wearable use, we’ve used a different style of reed switch, which is insulated.
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US$6.42
Because different parts sometimes use different voltage levels to communicate, voltage level translators can be the key to making different parts play nice. The PCA9306 is a dual bidirectional I2C-bus and SMBus voltage-level translator that's operational on the low side from 1.2V to 3.3V and on the high side from 1.8V to 5.5V. Simply apply your low and high-side reference voltages to the VREF1 and VREF2 respectively, connect your I/O and drive the Enable pin high to open bidirectional voltage translation without the use of a direction pin!
Delivery within 2-3 weeks
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US$6.36
Metal Hex Male/Female standoffs. #4-40 thread with 3/8" shank and 3/16" thread length. Can be stacked to create any length.
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US$6.31
Yes you read that correctly - 1 Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. Combine two in series for 0.5F/5V. Do not over voltage or reverse polarize these capacitors.
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US$6.29
This encoder is especially cool because it has a common anode RGB LED built in, as well as a push-button.
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US$6.23
Metal long standoffs: 1" long x 1/4" OD. Used to get your proto board up off the table. #4-40 thread. Fits most development boards with available holes.
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US$6.14
S-FF-M3X10-R, M3x10mm Threaded Round Female-Female Aluminum Standoff/Spacer Standoffs manufactured from aluminum are durable and corrosion resistant and...
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US$6.08

This is a simple plastic plate that holds an Arduino (Mega R3 or Uno) and self adhesive breadboard. This version still holds an Arduino and a self-adhesive clear breadboard but we've done away with the plastic clips and now provide screws which give you a more solid and simple connection.

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US$5.96
S-FF-M4X25-R, M4X25mm Round Threaded Female-Female Aluminum Standoff/Spacer Standoffs manufactured from aluminum are durable and corrosion resistant and...
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US$5.88

This is a package of ten 6 inch single female to female jumper wire set good for prototyping wire connection. These are 155mm long jumpers with female connectors on both ends.

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US$5.88

This is a package of ten 6 inch single male to male jumper wire set good for prototyping wire connection. These are 155mm long jumpers with male connectors on both ends.

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US$5.88
TRRS connectors are the audio-style connectors that you see on some phones, MP3 players and development boards. TRRS stands for "Tip, Ring, Ring, Sleeve," which reflects the fact that, unlike a standard stereo connector, this actually has three conductors and a ground.
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US$5.88
These are various leaded cables for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Cables come in red/black pairs. Dimensions: 36" long.
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US$5.88
These nylon standoffs are 3/4" long and tapped for a 4-40 screw. These are great for mounting your board in an enclosure, or just getting it up off the table. The black nylon will give your project a very sessy look.
Delivery within 2-3 weeks
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US$5.88
They have a very fine tip which allows you to pick up very small parts with precision. This is a great tool to have if you're working with surface mount components or anything with very small parts. The ESD-safe coating will also help prevent electro-static damage to sensitive electronic components.
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US$5.88
They have a very fine tip which allows you to pick up very small parts with precision. This is a great tool to have if you're working with surface mount components or anything with very small parts. The ESD-safe coating will also help prevent electro-static damage to sensitive electronic components.
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