Adafruit

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US$8.67
This coupler will connect a 5mm diameter shaft to a 10mm diameter shaft. A perfect add on for our stepper motors. Comes with two sets of double set-screws (two per side) for secure attachment.
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US$26.17
Timing belts are a fantastic way to transfer rotational motion (from a stepper motor) into linear motion (along a rail) and these GT2 belts are excellent for the task. 
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US$17.42
This button has a domed yellow plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
Delivery within 2-3 weeks
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US$17.42
This button has a domed white plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
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US$17.42
This button has a domed green plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
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US$17.42
This button has a domed blue plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the massive size and shallow depth of the button, it doesn't illuminate the entire button face evenly.
Delivery within 2-3 weeks
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US$11.46
This button has a flat white plastic cover with a black retaining ring around it. There's an optional LED included that will light up the button. The LED has a built in resistor so you can run it up to 12V but given the shallow depth of the button, it doesn't illuminate the entire button face evenly.
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US$11.46
This 60mm diameter arcade button is large and inviting and ready for all sorts of pressing and pushing. We've seen these on some games of skill in arcades, they're easy to mount on nearly any kind of enclosure. They're not waterproof or weatherproof, so best used indoors. 
Delivery within 2-3 weeks
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US$11.46
This 60mm diameter arcade button is large and inviting and ready for all sorts of pressing and pushing. We've seen these on some games of skill in arcades, they're easy to mount on nearly any kind of enclosure. They're not waterproof or weatherproof, so best used indoors. 
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US$31.62
With a slip ring assembly, your electronics can now twist and turn safely. Add wheel encoders, 360 degree sensors, rotating LEDs, rotors and more! We've seen a lot of people DIY slip ring's out of desperation but no longer, simply pick up one of these to solve any rotation needs you have. Inside the plastic tube is a gold plated slip ring for 12 wires. There are 12 color coded wire sets made of 28 AWG and no matter how you twist the assembly, they will remain in continuity.
Delivery within 2-3 weeks
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US$6.92
Now you can hook up your LiPo Charger or a Arduino Micro/Leonardo/Raspberry Pi using the same cable. Approximately 8" long from end to end. This cable does not contain a hub, so you can only connect one USB device at a time (to either end). The micro end does data and power, the mini side only does power (not data).
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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$6.92
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 16-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 16-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard. 
Delivery within 2-3 weeks
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 28-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 28-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
Delivery within 2-3 weeks
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US$5.17
If you want to have a nice clean board (or maybe you're doing some repair) you can use this stiff-bristled brush without worries. Some people like to drip a little rubbing alcohol on their PCBs after soldering and then scrubbing to remove rosin/flux. Finally, you have the right tool for the job. About 7" long from end to end, scrubby part is 1.5" x 0.5" with 0.5" bristles.
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