Adafruit

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US$3.07
There are 20 pins, 10 on each side, with 0.1" spacing so you can easily plug it into a breadboard with plenty of space for wiring left over.
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US$3.17
Give yourself a lift with this 2x20 female socket header that has slightly longer than usual pins. You can plug this into your Raspberry Pi GPIO port and then plug a HAT or Bonnet or Phat on top. Especially useful for Bonnets that have slim headers on the bottom, but you want them to clear some of the components on the Pi, or fit into a case nicer.
Delivery within 2-3 weeks
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US$3.28
Diffused 5mm tri-color LED with separate red, green and blue LED chips inside! Nice indicator, and fun to color-swirl. 60 degree viewing angle.
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US$3.42
Stack multiple plates, breakouts etc onto your Raspberry Pi with this custom-made extra-tall and extra-long 2x13 female header. The female header part has extra spaces to make it 13.6mm tall: when placed on your Pi, a PCB will clear the Ethernet and USB jacks.
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US$3.42
By popular demand, we now have a handy extension cord for all of our JST-terminated battery packs (such as our LiIon/LiPoly and 3xAAA holders). One end has a JST-PH socket, and the other end has a matching plug. Between the two, 500mm of color coded wire.
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US$3.42
These are standard 6-pin, 8-pin and 10-pin 0.1" spacing female headers...with a twist! The pins are extra long which means you can use these to stack shields!
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US$3.42
Fits any standard AAA battery. When using rechargeable NiMH the output voltage will range from about 3.7V with charged batteries to 2.7V at the end of life with a nominal voltage of 3.6V. When using alkalines, the output will range from 4.6V with new batteries to 3.3V at the end of life with a nominal voltage of about 4.5V
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US$3.42
A mini roll of thermal paper, this fits very nicely into our mini thermal printer. 2.25" wide (about 57mm) and 50 feet long (15 meters). BPA-free. Perfect for use with our mini thermal printer!
Delivery within 2-3 weeks
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US$3.42
Add another 8 pins to your microcontroller using a MCP23008 port expander. The MCP23008 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 8 general purpose pins. You can set each of 8 pins to be input, output, input with a pullup or open drain.
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US$3.42
A 0.1uF capacitor right next to the VCC pin of your chips will improve stability by filtering out power supply spikes and noise that can cause flaky behavior. We love these little guys, they have 0.1" spacing so fit into any perf or breadboard, compact and good quality.
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US$3.42
These are standard '130 size' DC hobby motors. They come with a wider operating range than most toy motors: from 4.5 to 9VDC instead of 1.5-4.5V. This range makes them perfect for controlling with an Adafruit Motor Shield, or with an Arduino where you are more likely to have 5 or 9V available than a high current 3V setting.
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US$3.42
Two wires are used to control/power the vibe. Simply provide power from a battery or microcontroller pin (red is positive, blue is negative) and it will buzz away. Works from 2V up to 5V, higher voltages result in more current draw but also a stronger vibration.
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US$3.42
Stretch out your servo connections with this flexible servo extension cord. It has a 3 pin shrouded "male" connection to plug your servo into and then, 30cm later, a 3 pin female connection. It even keeps the common red/black/white color coding.
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US$3.42
These machined bus bars are for when you want to distribute power through a project, we think they are ideal for robots and LED pixel grids where you have tons of current and a lot of loose wiring to control.
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US$3.42
By installing these over the cable, they form-fit to make a seal, keeping your project box innards safe from the outdoors. 
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