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Or get a small motor off eBay, and make your own. You just need some bearings to hold the turntable, and a belt to connect the small wheel on the motor to the big wheel on the turntable. …

You need two more things, apart from your motor and Arduino. An H-bridge to interface the Arduino to the motor. This is a chip which allows you to control the direction of the current in the motor. …

A DC motor will probably accelerate too slowly to achieve the required speed in such a short distance. My advice would be to use something with less travel but more speed. … (or you could use a motor to pull the catch). Lastly, as David Kessner suggested, you could have a pair of counter-rotating flywheels. …

They're called Lavet style motors and are a single pole stepper motor. It can only go in one direction, and turns 90º at a time. … Take a look at stepper motor driver chips which incorporate microstepping like the Allegro A4982. …

This is a Brushless motor. The thing about brushless motors is that an electronic circuit is required to switch the current between the coils as the magnetic part spins. …

How about an alternative approach? Use a solenoid. You only need to inject a little bit of energy into the system to get it oscillating. Wind up a big coil. Attach a steel rod to the back of the ro …

It's a stepper motor. …

If you want an internet connected helicopter, you'll need something like the Microchip MRF24WB0MA RF transceiver module. However, integrating this with the helicopter's electronics will not be easy …

Firstly some background: I would like to make a magnetic stirrer, like the ones they use in chemistry labs: A small bar magnet sits inside the glass jar, while another bar magnet, attached to a motor … But I'm sure it must be possible to do this without the motor underneath, simply using coils. Either a brushless motor or a stepper motor. …

A pancake motor (AKA Floppy Drive motor) has a planar separation between the rotor and stator, and so is most suitable for working through a sheet of glass. …

I would like to produce a low cost high power:weight servo drive using a brushless outrunner motor, like those use in radio control planes: Some of these motors leak enough magnetic flux out the sides … Would I need to phase shift the Hall signals depending on the speed of the motor? Has anyone done this before? I can't seem to find anyone publishing such a project online, which makes me wonder... …

If you want to reduce the airflow of the fan, one easy way to do this is to simply partially block the intake with a piece of paper. If you want to get fancy, you could even make an adjustable system, …

Have you tried using a normal recharegable AAA battey? They're only 1.2v, but they have a lower internal resistance, so it might make up the difference. It's worth a try.

Now the system can detect you pushing on the object, and it will drive the motor to create the illusion that there's no motor there at all. … The good news is that, if you can afford it, you can buy complete linear motor motion systems from companies like Aerotech or Baldor Motion. …

Based on your edit, I think that my solution involving linear motors is a little over-the-top. Your application is to simply an art demo which reproduces someone's drawing. While this needs to have go …