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Electromechanical

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SSR-40DA Solid State Relay - 40A (3-32V DC Input)
US$12.53
This particular SSR can switch current loads of up to 40A with a 3-32V DC input. Each one of these relays is equipped with four screw terminals (for use with ring or fork connectors) and a plastic cover that slides over the top of the relay to protect the terminals.
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1649-ADA Multi-Colored Heat Shrink Pack - 3/32" + 1/8" + 3/16" Diameters
US$8.67
Each pack contains ten 6" pieces of the following sizes: 3/32", 1/8", and 3/16".  You get three of each in black and red, and one of each in green, blue, white, and yellow.  It's a nice colorful mixed bag of heat shrink!
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SRUDH-SS-124D1 Relay 24V, 12A, SPDT
US$2.09
SRUDH-SS-124D1 Relay 24V, 12A, SPDT Relay Coil : 24 VDC Contact : 12 A 120 VAC / 12 A 28 VDC S.P.D.T
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1824-ADA 3x4 Phone-style Matrix Keypad
US$13.13
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of plastic with sturdy plastic buttons. The keys are connected to a matrix so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad.
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2671-POLOLU Extended Stamped Aluminum L-Bracket Pair for Plastic Gearmotors
2671-POLOLU Extended Stamped Aluminum L-Bracket Pair for Plastic Gearmotors
US$6.82
These light-weight brackets (approximately 2.5 g each) are specifically designed for plastic gearmotors.
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2670-POLOLU Stamped Aluminum L-Bracket Pair for Plastic Gearmotors
2670-POLOLU Stamped Aluminum L-Bracket Pair for Plastic Gearmotors
US$6.78
These brackets are sold in pairs, and each bracket comes with two 1″ long and two 0.75″ long #2-56 screws for securing different size motors. 
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PH0789N8 1.5" Alnico Bar Magnets (pair) with keeper
PH0789N8 1.5" Alnico Bar Magnets (pair) with keeper
US$15.25
1.5" Alnico Bar Magents (Pair) with spacer and keepers. Supplied in cardboard boxes 38 x 11 x 6 mm.
Delivery within 2-3 weeks
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PH0796N8N Ceramic Breakable 2" Magnets, Pack of 10
PH0796N8N Ceramic Breakable 2" Magnets, Pack of 10
US$4.73
Candy bar style breakable magnets. 2" in length.
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PH085C Rectangular Zinc Plated Steel Bar Magnets, 150x10x10mm, Pair with Keepers
PH085C Rectangular Zinc Plated Steel Bar Magnets, 150x10x10mm, Pair with Keepers
US$23.12
Economy steel magnets with keepers. Individually packaged pairs.
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PH0786D Painted Blue/Red Bar Magnets - Chrome Steel, 100 x 12 x 5 mm
PH0786D Painted Blue/Red Bar Magnets - Chrome Steel, 100 x 12 x 5 mm
US$23.57
100 x 12 x 5 mm (approximate size). Chrome steel magnets. Perform a variety of activities and experiments involving magnetism. Low magnetic stregnth for careful experiments.
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PH0786E Painted Blue/Red Bar Magnets - Chrome Steel, 150x12x5mm
PH0786E Painted Blue/Red Bar Magnets - Chrome Steel, 150x12x5mm
US$8.83
150x12x5mm (approximate size). Chrome steel magnets. Perform a variety of activities and experiments involving magnetism. Low magnetic stregnth for careful experiments.
Delivery within 2-3 weeks
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PH0795D Alnico Horseshoe U Magnets - 37x8x8mm
PH0795D Alnico Horseshoe U Magnets - 37x8x8mm
US$18.63
An Alnico Horshoe Magnet in a cardboard box.
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1784-ADA Large Surface Transducer with Wires - 4 Ohm 5 Watt
1784-ADA Large Surface Transducer with Wires - 4 Ohm 5 Watt
US$30.63
Turn any surface/wall/table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead, a metal rod is wrapped with the voice coil.
Delivery within 2-3 weeks
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1891-ADA Thin Plastic Speaker w/Wires - 8 ohm 0.25W
1891-ADA Thin Plastic Speaker w/Wires - 8 ohm 0.25W
US$2.53
This 1.5" diameter speaker cone is the perfect addition to any audio project where you need an 8Ω impedance and are using 0.25W or less of power. We particularly like this cone as it's very simple and its plastic body is extremely lightweight and thin.
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1890-ADA Mini Metal Speaker w/ Wires - 8 ohm 0.5W
1890-ADA Mini Metal Speaker w/ Wires - 8 ohm 0.5W
US$2.88
This tiny 1" diameter speaker cone is the perfect addition to any small audio project where you need an 8 Ω impedance and will be using 0.5W or less of power. We particularly like this cone as it's very simple and its metal body is extremely lightweight.
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