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Electromechanical

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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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2812-POLOLU Big Pushbutton Power Switch with Reverse Voltage Protection, MP
US$7.66
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 MP version operates from 4.5 V to 40 V and can deliver continuous currents up to around 8 A.
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2991-POLOLU G2 High-Power Motor Driver 18v17
US$74.92
This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3″ × 0.8″ board supports a wide 6.5 V to 30 V voltage range and is efficient enough to deliver a continuous 17 A without a heat sink. Additional features of this second-generation (G2) driver include reverse-voltage protection along with basic current sensing and current limiting functionality.
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2995-POLOLU G2 High-Power Motor Driver 24v21
US$83.94
This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3″ × 0.8″ board supports a wide 6.5 V to 40 V voltage range and is efficient enough to deliver a continuous 21 A without a heat sink. Additional features of this second-generation (G2) driver include reverse-voltage protection along with basic current sensing and current limiting functionality.
Delivery within 2-3 weeks
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2994-POLOLU G2 High-Power Motor Driver 18v25
US$89.92
This discrete MOSFET H-bridge motor driver enables bidirectional control of one high-power DC brushed motor. The small 1.3″ × 0.8″ board supports a wide 6.5 V to 30 V voltage range and is efficient enough to deliver a continuous 25 A without a heat sink. Additional features of this second-generation (G2) driver include reverse-voltage protection along with basic current sensing and current limiting functionality.
Delivery within 2-3 weeks
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R12-17D3-12P Relay, 4PDT,12VDC 3A, Through hole, Non latching
US$13.93
Standard general use 4PDT relay, triggered by 12V and getting a maximum of 3A at 110VAC, or 3A at 30VDC.
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DS1E-S-DC5V Relay, SPDT, 5 VDC, 2 A, Through Hole, Non Latching
US$4.13
Standard general use SPDT relay, triggered by 5V and getting a maximum of 0.6A at 110VAC, or 2A at 30VDC.
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RM-1 ONE CHANNEL RELAY MODULE 5V
US$4.09
Ready to use 10 Amp Relay Module for your Arduino projects. Opto-Coupler input signal protection. Jumper selectable high or low input control. Easy to connect terminal blocks for power input and relay output. Status LED’s for Power In and Relay Operation.
Delivery within 2-3 weeks
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