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This switching regulator uses the SEPIC topology to produce 12 V from input voltages between 2.5 V and 18 V. The wide input range coupled with its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below 12 V. The compact (0.4″ × 0.575″) module can supply over 200 mA in typical applications.

This switching regulator uses the SEPIC topology to produce 9 V from input voltages between 2.5 V and 18 V. The wide input range coupled with its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below 9 V. The compact (0.4″ × 0.575″) module can supply over 300 mA in typical applications.

This credit-card-sized board crams in a lot of peripherals, making it ideal for prototyping mbed NXP LPC1768 applications. Some features include a 128×32 backlit LCD, 5-way joystick, 3-axis accelerometer, and an RJ45 Ethernet connector.

Great for learning the basics of gears and linkages, this Tamiya kit contains all the parts necessary to make a remote controlled crawler that picks up ping pong balls. The instructions include directions for assembling the kit with either an arm, bucket, or shovel for collecting ping pong balls.

Great for learning the basics of gears and linkages, this Tamiya kit contains all the parts necessary to make a remote controlled chassis with a ping pong ball collecting appendage. The instructions include directions for assembling the kit with either an arm, bucket, or shovel, and they include directions for a ping pong ball collecting competition.

With possible gear ratios of 39.6:1, 47.6:1, 61.7:1, and 74:1, the Tamiya 72007 4-Speed High-Power Gearbox is well-suited for most applications that require a balance of speed and torque.

The primary feature of this gearbox is a worm gear, which locks the output shaft when the motor is not turning. Its high gear ratios of 84:1, 216:1, 555.4:1, and 1428.2:1 make this gearbox appropriate for small walking robots, lifting mechanisms, and other applications where high torque is desired.

This NEMA 23-size hybrid bipolar stepping motor has a 1.8° step angle (200 steps/revolution). Each phase draws 2.8 A at 3.2 V, allowing for a holding torque of 18.9 kg-cm (260 oz-in).

This NEMA 23-size hybrid stepping motor can be used as a unipolar or bipolar stepper motor and has a 1.8° step angle (200 steps/revolution). Each phase draws 1 A at 8.6 V, allowing for a holding torque of 13.5 kg-cm (190 oz-in).

This NEMA 23-size hybrid stepping motor can be used as a unipolar or bipolar stepper motor and has a 1.8° step angle (200 steps/revolution). Each phase draws 1 A at 5.7 V, allowing for a holding torque of 3.9 kg-cm (54 oz-in).

This gearbox features a low-current brushed DC motor, which is great for projects where you want to keep your power consumption to a minimum. Its single gear train can be assembled to have one of three gear ratios: 12.7:1, 38.2:1, or 114.7:1.

The RoboClaw motor controllers from Orion Robotics can control a pair of brushed DC motors using serial, RC, or analog inputs. Integrated dual quadrature decoders make it easy to create a closed-loop speed control system. This version can supply a continuous 5 A per channel (10 A peak).

The Arduino Micro is essentially a shrunk-down (1.9″ × 0.7″) version of the Arduino Leonardo: it is a microcontroller board based on the ATmega32U4 running at 16 MHz with 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs). This board ships with the male header pins soldered in, as shown in the product picture.

This UL-listed 25 W desktop-style switching power adapter supplies up to 5 A at a regulated 5 VDC from input voltages of 100 – 240 VAC. It includes a 1.5 m (5 ft) AC power cord terminated by a three-prong, US-style plug and has a 1.5 m (5 ft) DC power cord that is terminated by a center-positive, 5.5 × 2.1 mm barrel connector.