Sparkfun

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US$2.10
These headers are made to work with the Teensy 3.2 and Teensy LC development boards. Each kit of headers makes your Teensy breadboard compatible and will allow for stacking a Teensy and Teensy-compatible shield board. This kit includes five headers (two 13-pin, one 7-pin, one 3-pin, and one 2x7 right-angle SMT), enough to connect your chosen Teensy in any configuration you need!
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US$2.73
Side-looking Infrared Emitters and IR Detectors. These simple devices operate at 940nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$8.33

These SparkFun needle tipped multimeter probes are great for attaching to multimeters, power supplies, oscilloscopes, function generators, etc. Dimensions: 36" Long.

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US$1.33
This is a 5mm clear infrared LED. These devices operate between 940-950nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$29.33
This is the newest 2.4GHz transceiver from Nordic Semiconductor, using the nRF24L01+ module. Dimensions: 0.8x0.9". This transceiver IC operates in the 2.4GHz band and has many new features! Take all the coolness of the nRF2401A and add some extra pipelines, buffers, and an auto-retransmit feature - very nice!
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US$2.09
This is an integrated Hall effect latched sensor. Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor.
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US$14.46
These are very slim, extremely light weight batteries based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cell outputs a nominal 3.7V at 1000mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require special charging.
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US$1.33
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$34.73

This provides a very easy way to start using MOSFETS for your next high current project. This shield allows you to use a computer power supply (or any other power source) to use your Arduino to switch high current. With RFP30N06LE MOSFETS, you can easily control a lot of current directly from your Arduino.

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US$1.39
They're great when you need a lot of color from not a lot of board space. Features: Viewing angle: 120 degrees. Red: (640nm) @ 250mcd. Green: (525nm) @ 880mcd. Blue: (470nm) @ 180mcd.
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US$20.93
The EasyDriver is a simple to use stepper motor driver, compatible with anything that can output a digital 0 to 5V pulse (or 0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). It requires a 6V to 30V supply to power the motor and can power any voltage of stepper motor.
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US$28.06
This plugs directly into your USB port and provides a programming socket for the ATTiny45 and 85. Just slot an ATtiny into the socket, plug the programmer into your USB port and start up the Arduino IDE.
Delivery within 2-3 weeks
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US$104.14

This GPS receiver is a complete GPS smart antenna receiver, that includes an embedded antenna and GPS receiver circuits. This low-cost unit outputs an astounding amount of position information 5 times a second. The receiver is based on the proven technology found in LOCOSYS 66 channel GPS SMD type receivers that use MediaTek chip solution.

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US$0.39
This is a very common 0.1uF capacitor. Used on all sorts of applications to decouple ICs from power supplies. 0.1" spaced leads make this a perfect candidate for breadboarding and perf boarding. Rated at 50V.
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Minimum quantity for "COM-08375 Capacitor Ceramic 0.1uF" is 5.

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US$5.53
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$6.85

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$4.92

This is QRE1113 breakout board features a digital output, using a capacitor discharge circuit to measure the amount of reflection. This tiny board is perfect for line sensing when only digital I/O is available, and can be used in both 3.3V and 5V systems.

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US$16.33

This is an excellent choice for anything that requires a small battery with a lot of punch. The voltage is low enough not to tax your regulating circuits, and the discharge rate is high enough to accommodate a lot of electronics and a few small motors. The battery has two cells and outputs 7.4V storing 1000mAh of charge.

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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$1.33
This is a breakout board made for SOT23 style. 6 pin SOT-23 to DIP adaptor. Created to take SOT23 of various pin sizes breakout to DIP. This will work with 3-pin MOSFETs, BJTs, Voltage Regulators (SOT-23-5), and various other Micro6, Micro5, etc packages. DIP width is 0.300" (300mil) and will fit nicely into any breadboard or DIP socket.
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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$13.93
These are very slim, extremely light weight batteries based on Lithium Ion chemistry. Each cell outputs a nominal 3.7V at 850mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require special charging. Do not attempt to charge these with anything but a specialized LiPo charger. Battery includes built-in protection against over voltage, over current, and minimum voltage.
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US$1.33
This DC power jack/connector is just like the other one that we carry except that it's terminated with breadboard-friendly pins instead of wide solder terminals. These are also compatible with our DC wall supplies and have a 5mm jack, with a 2.1mm center pole diameter.
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US$5.53
This is a simple board which holds a 20mm coin cell battery (such as a CR2032) and gives you 4 connection points (two positive and two negative) for sewing into your project.
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US$11.99
These are very slim, extremely light weight batteries 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 2000mAh! This battery comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. Do not attempt to charge these with anything but a charger specifically designed for Lithium Ion batteries.
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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$162.33

This is the comprehensive guide to ZigBee wireless networks. This kit includes many of the parts and pieces you will need to work through the examples in the book. If you're serious about learning everything you need to know about XBee networks, this kit and the book will get you up to speed in no time (or as long as it takes you to get through the book).

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US$7.87

This smaller solenoid is designed to work directly with 5V which makes it a great match for embedded projects.

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US$16.73

This is a 3.3V Arduino running the 8MHz bootloader meant for users that understand the limitations of system voltage. It's a great board that will get you up and running quickly.

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US$52.06
These are very compact batteries based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cell outputs a nominal 3.7V at 2000mAh! This solid 3 cell pack (6Ah) comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. Do not attempt to charge these with anything but a charger specifically designed for Lithium Ion batteries.
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US$9.89
The SparkFun micro:bit Breakout is a board that connects to the BBC micro:bit and expands the capabilities of the development platform by providing access to more pins and allowing for connections to the I2C and SPI buses.
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US$2.73
This is our new Hobby Motor now with a 6mm, 10 tooth, gear to make your basic projects a little simpler to manage. It works well for basic things like making a fan or spinning something pretty fast without much resistance.
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