Electromechanical

US$2.73
Knife switches for low voltage experiments (less than 36V) with plastic bases. 
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US$1.27
Knife switches for low voltage experiments (less than 36V) with plastic bases. 
Delivery within 2-3 weeks
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US$2.69
Operates on 1.5V or 3V DC. Speed: 7000-11000 RPM. Motor is 40 MM long x 20Mm in diameter. Shaft size: 2 MM diameter x 8 MM long.
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US$0.80
CM7912 Ceramic Magnet, Disc, 25mm Dia., 6mm Thick We offer a variety of economical ceramic bar, disc, and ring shaped magnets.  Magnets are unpainted,...
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US$4.26
CM7907-PK/2 Ceramic Magnet, Pack of 2, 38 x 8mm Rings, 1 Red, 1 Blue We offer a variety of economical ceramic bar, disc, and ring shaped magnets....
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US$4.42
This high-power, 130-size brushed DC motor can be used as a direct replacement for lower-power 130-size motors to get more torque and speed out of your gearmotor, but it will also draw more current and typically wear out faster.
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US$12.57
35-3429 Switch Push Button ON (OFF) SPST Plunger 15A 250VAC Momentary Contact Screw Panel Mount Supplier: GC Electronics Part No:...
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US$23.45
This high power 4" diameter speaker will amp up any audio project where you need loud sound! It is 4 ohm impedance, rated for 20W continuous power. (This thing is really loud) It also has four handy mounting tabs 3 inches apart, and a grill that fits on top. The grill is to protect the cones, and is not necessary for use. 
Delivery within 2-3 weeks
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US$2.03
This large (30mm diameter) piezo element is nicely enclosed with mounting holes so you can attach easily. Piezo elements convert vibration to voltage or voltage to vibration. 
Delivery within 2-3 weeks
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US$0.81

Dimensions: 1.25" x .25" (30mm x 6mm). Rated: 250V (note: indicate or not indicated on the fuse.). Equivalent to Littlefuse 314 Series. Prepackaged: Order fuses in increments of 5 pcs.

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US$4.19

This is an In-Line Fuseholder for 1.25"x.25" AGC fuses. Built-in spring ensures good fuse connection. Vinyl covered wire with stranded copper center. Specs: 14AWG Wire. 19/25" Wire Lengths. 2.5" Body Length. Color(Body/Wire): Black/Red. 

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US$27.93
This Metal Gear Digital Servo for Arduino Robot is a low price high quality digital robot servo.
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US$3.49
Suggested voltage: 3V DC, No Load Speed: 65 +/- 10rpm, No Load Current: 125mA (max.170mA), Torque: 800gf.cm min.
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US$3.49
Suggested Voltage: 4.5VDC, No Load Speed: 90 ±10 rpm, No Load Current: 190mA (max. 250mA), Torque: 800gf.cm min.
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US$13.13
This is the perfect addition to any audio project where you need 4 ohm impedance and 3W or less of power. This is a set of two 2.8" x 1.2" speakers. We particularly like these speakers as they are small and enclosed for good audio volume and quality.
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