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Electromechanical

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MOT-500 DC Hobby Motor
US$1.19
This DC micro motor is perfect for students and hobbyists to demonstrate the functioning of a DC motor.
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2825-POLOLU 70:1 150RPM Metal Gearmotor 37Dx70L mm with 64 CPR Encoder
US$63.47
This gearmotor is a powerful 12V brushed DC motor with a 70:1 metal gearbox and an integrated quadrature encoder that provides a resolution of 64 counts per revolution of the motor shaft, which corresponds to4480 counts per revolution of the gearbox’s output shaft. These units have a 0.61"-long, 6 mm-diameter D-shaped output shaft.
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BUZ-125 Passive Buzzer
US$0.97
This passive buzzer will produce audio only when a AC signal is supplied to the device. When you apply a DC voltage, the buzzer will not generate a tone since it will require a sinusoidal wave. You can achieve this buy supply either a sine wave from a function generator or create PWM waves using a microcontroller or 555 timer. If you are looking for buzzers that make noise when a DC signal is supplied we highly recommend looking for active buzzers.
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SRD-5VDC-SL-C RELAY 5VDC 10A SPST
US$2.09
Single Pole Single Throw Relay. Coil voltage: 5VDC. Current rating: 10A/125VAC, 10A/250VDC, 10A/30VDC. Approvals: UL, CUL, TUV. Dimensions: 18.8x15x15.3mm (LxWxH).
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KEY-SW Key Lock Switch SPST
US$13.33
SPST, Key removable from 2 positions. Used in computer locking and other security systems. Features: All keys are alike, Mounting hole: 0.75 inches, 0.25" quick connect terminal, Ratings: 125VAC @ 6A., Length: 1.48 inches, Includes: Lock switch, 2 keys, nut and washer.
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RM-16 Channel Relay Module, 5V
US$27.93
This relay module is perfect for robotics or appliance control. Can be easily controlled by any standard microcontroller such as Arduino or Raspberry Pi. Total of 16 relays rated at 10A each. Each relay has a LED to indicate when it is picked. Each relay is opto-coupled for protection.
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KN-9 Aluminium Silver audio knob
US$0.92
Small silver aluminium knob, common on audio equipment. They’re 15mm wide and 17mm high, and a plastic fitting inside can fit a standard audio potentiometer or rotary encoder shaft.
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KN-7 Aluminium Black audio knob
US$0.92
Small black aluminium knob, common on audio equipment. They’re 15mm wide and 17mm high, and a plastic fitting inside can fit a standard audio potentiometer or rotary encoder shaft.
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MOT-21 66K RPM Micro Coreless DC Motor
US$2.79
66K or 66,000 RPM is a very high speed for a tiny product like this. The speed often reminds people of a dentist drill tool when heard. The speed isn’t high enough to start making holes into objects but it is recommended for small RC Planes that require high speeds.
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D-S-X5-08 Syma X5C-1 Clockwise Motor Replacement Unit
US$6.99
If you own an X5C or a X5C-1 and accidently crash your drone or have a dead motor on the unit, you can replace the motor with this product. You can also use some ingenuity to modify the shaft and add some custom propellers to the unit to offer better lift or build your own custom drone from repurposed materials. The unit is a 7 x 20 mm coreless motor that runs at 3.7 Max, any higher and it could reduce the lifespan of the motors significantly.
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D-S-X5-07 Syma X5C-1 Counter Clockwise Motor Replacement Unit
US$6.99
If you own an X5C or a X5C-1 and accidently crash your drone or have a dead motor on the unit, you can replace the motor with this product. You can also use some ingenuity to modify the shaft and add some custom propellers to the unit to offer better lift or build your own custom drone from repurposed materials. The unit is a 7 x 20 mm coreless motor that runs at 3.7 Max, any higher and it could reduce the lifespan of the motors significantly.
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MAG-RC Magnet block, 1” x ¾” x 5/32” with mounting hole
US$1.91

Small square magnet with a mounting hole in the center, perfect for magnetic experiments. It is 1 x ¾ x 5/32 inches (LxWxH), and the mounting hole has a 3/16” diameter, with one side expanding to 9/32” to accept a screw head (it’s about 3/64” deep).

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MAG-BU Button Magnet, ½” x 5/32”
US$1.32
Small button magnet, perfect for magnetic experiments. It has a diameter of ½” and is 5/32” thick.
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MAG-HE High Energy Magnet Block, 1-7/8” x 7/8” x 3/8”
US$2.41
Generic rectangular Magnet, perfect for scientific experiments that require magnets. It is 1-7/8 x 7/8 x 3/8 inches (L x W x D).
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MOT-DRV8825 DRV8825 3D Printer Stepper Driver Board
US$9.79
It is basically a DRV8825 stepper motor driver module that comes with a heatsink in a ESD safe bag. The features from the DRV8825 chips will offer you adjustable current limit, overcurrent and temperature protection with a six micro-resolution (1/32 step) feature. The module can handle from 8.2 - 45v. 
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