Electromechanical

US$1.42
The MSW-110 is a lever miniature snap action.    Order#  Type  Rating  Size (LxHxW)...
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US$2.73

This through-hole speaker is great for projects where you need something that sounds better than a piezo buzzer but don't have room for a full-blown speaker. This 30mm diameter speaker is encased in plastic and will handle about 100mW of power.

Delivery within 2-3 weeks
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US$18.13
It's the end of the world, and you need a button to press. This is it. A 100mm diameter (outside diameter) dome illuminated push button comes with an LED, securing nut and a pre-installed long life horizontal microswitch. Button can also be adjusted to a low profile button by removing the middle ring.
Delivery within 2-3 weeks
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US$9.73
Number of Contacts: 4. Terminals: Pin. Voltage Ouput Repetitive Vdrm: 400V. Isolation Voltage Viso: 3KV. Contact Rating (Maximum): 8A.
Delivery within 2-3 weeks
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US$79.65

This 200 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation but it could also be used as a very precise input knob.

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US$2.73
When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. When the magnetic field is removed, the reeds separate and the switch opens. This makes for a great non-contact switch. This switch can carry up to 1A.
Delivery within 2-3 weeks
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US$1.25
This is a right angle PC mount tactile push button. This right-angle tactile switch has a great 'click' to it. Also, because it's a through-hole design it's very sturdy.
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US$2.73
This is a very useful panel-mount locking button/switch. Press it once for 'on', once again for 'off'. It is a SPST N.O. with 7/16" threading. This button has a nice 'click' when you press it.
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US$1.33
This is your standard fridge magnet, perfect for holding up quite a bit of weight. Grade C8. Magnetization is throughout the thickness of the magnet. Dimensions: 0.709x0.197". Features: BrMax: 3850 Gauss. Pull Force: 1.5 lbs.
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US$2.72
Whisker Switches - Very sensitive lever switches. Great for detecting objects such as other sumo bots, walls, balls, etc. Simple to wire and attach to external ‘bumper’ bars.
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US$4.13

These are high quality Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage, and/or high current devices. This relay’s coil is rated up to 12V, with a minimum switching voltage of 5V. The contacts are rated up to 5A (@250VAC, 30VDC).

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US$4.13
This is a five way selectable switch often found as the pickup selector on electric guitars. The lever clicks through five different positions so you can select from three different inputs and a combination thereof.
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US$25.13
This metal gearmotor is a compact (1.16" x 0.61" x 0.61") brushed DC motor with an enclosed 115:1 metal gearbox. These units have a 0.365"-long, 3mm-diameter D-shaped output shaft.
Delivery within 2-3 weeks
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US$6.99

This is a white pair of micro metal gearmotor bracket extended, which enables convenient mounting of popular Sanyo-style miniature metal gearmotors.

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US$20.93
This quadrature encoder works with our micro metal gearmotors, 42×19mm wheel, and extended bracket to measure the rotation speed and direction of the wheel. 
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