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Electromechanical

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KEY-SW Key Lock Switch SPST
US$11.78
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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SW-EMERG EMERGENCY STOP SWITCH
US$6.29
This pushbutton EMERGENCY STOP SWITCH has two sets of contacts N/O and N/C. Pushing the switch latches the contacts in the opposite condition. Turning the button releases the latched condition to return to normal operation. Contacts are provided with screw terminals. Contacts are rated 600V/10A.
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2815-POLOLU Big MOSFET Slide Switch with Reverse Voltage Protection, HP
US$10.52
This breadboard-compatible module is an alternative to bulky power switches. It uses a small integrated slide switch to control a high-side power MOSFET that can deliver continuous currents up to around 16 A at 4.5 V to 40 V. The board features reverse-voltage protection and also makes it easy to control the MOSFET with an external switch or the digital output of a microcontroller.
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2814-POLOLU Big MOSFET Slide Switch with Reverse Voltage Protection, MP
US$5.95
This breadboard-compatible module is an alternative to bulky power switches. It uses a small integrated slide switch to control a high-side power MOSFET that can deliver continuous currents up to around 8 A at4.5 V to 40 V. The board features reverse-voltage protection and also makes it easy to control the MOSFET with an external switch or the digital output of a microcontroller.
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2813-POLOLU Big Pushbutton Power Switch with Reverse Voltage Protection, HP
US$11.10
The Pololu Pushbutton Power Switches are sophisticated power control alternatives to bulky mechanical switches. The main function is pushbutton-based latching power control, where one push turns on power and another push turns it off. Additional control inputs allow advanced applications such as automatic shutdown by the device being powered. This HP version operates from 4.5 V to 40 V and can deliver continuous currents up to around 16 A.
Delivery within 2-3 weeks
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