Electromechanical

US$2.77
The body is a black plastic with the LED built inside. There are two contacts for the button and two contacts for the LED, one marked + and one -. The forward voltage of the LED is about 2.2V so connect a 220 to 1000 ohm resistor in series just as you would with any other LED to your 3V or higher power supply. 
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US$1.33
The Small sized GTE (Goes To Eleven) Knob can fit onto potentiometers with a 6mm wide shaft thanks to a brass insert with a set screw.
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US$7.61
A button is a button, and a switch is a switch, but this LED illuminated arcade buttons is in a class of its own. Its the same size as a 'standard' 30mm arcade but has a built in LED that can be controlled separately from the switch action - either to indicate or just to look good. 
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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$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$1.99

These pancake vibration motors shake like crazy at about 3v.

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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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US$5.41
This keypad has 16 buttons, arranged in a 4x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix.
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US$7.20
These are powerful Alnico bar magnets shipped in pairs with end keepers. Magnets are painted with north and south poles clearly marked. Width 1/2", thickness 1/4".
Delivery within 2-3 weeks
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US$12.73
These are powerful Alnico bar magnets shipped in pairs with end keepers. Magnets are painted with north and south poles clearly marked. Width 1/2", thickness 1/4".
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US$33.43
These are powerful Alnico bar magnets shipped in pairs with end keepers. Magnets are painted with north and south poles clearly marked. Width 1/2", thickness 1/4".
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US$3.42
This 3" diameter speaker cone is the perfect addition to any audio project where you need an 4 ohm impedance and 3W or less of power. We particularly like this cone as it has 4 handy mounting tabs 60mm apart.
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US$5.17
This 3" diameter speaker cone is the perfect addition to any audio project where you need an 8 ohm impedance and 1W or less of power. We particularly like this cone as it has 4 handy mounting tabs 60mm apart.
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