DIY magnetic stirrer: description, required materials

02.09.2019 DIY, House
DIY magnetic stirrer: description, required materials

A magnetic stirrer is necessary for those who like to do various chemical experiments. With the help of this device, various ideas can be translated into reality not only in the laboratory, but also in the domestic environment. In order not to spend personal savings, you can build a magnetic stirrer with your own hands in just a few hours. As the main details, you can use an unnecessary printer and CD-ROM. To make the design multifunctional, you need to prepare an old CRT monitor.

Magnetic stirrer


Many craftsmen prefer to make a magnetic stirrer with your own hands. Such an aggregate is simply indispensable in cases where you need to evenly mix, homogenize or simply dissolve several liquid media without pre-heating. Magnetic stirrers are actively used in medical, pharmaceutical, biochemical, diagnostic, and microbiological laboratories.

All these industries are focused on working with live, sensitive, easily decaying samples that are forbidden to contaminate. If you make a magnetic stirrer yourself from high-quality inert polymers and composites, then you can get a high-quality device that will have a small area of ​​contact with the mixture.

It is worth noting that some factory models make it easy to mix a 10-liter bucket of water. And this means that the mixer will perfectly cope with 5 liters of viscous liquid. The effectiveness of the device is due to the presence of a wear-free magnetic head.

Required tools

To make a magnetic stirrer yourself , you need to prepare in advance all the necessary materials and devices:

  • pliers;
  • multimeter;
  • nippers;
  • drill and drill ;
  • screwdrivers;
  • 12V power supply;
  • wires;
  • neodymium magnet (can be taken from an old hard drive);
  • fuses;
  • solder and soldering iron;
  • adjustable wrench;
  • anchor for stirring;
  • sockets and connectors;
  • PC fan;
  • switch;
  • rubber feet (prevent the unit from slipping);
  • superglue;
  • plastic container.

It is worth noting that you can make a magnetic stirrer with your own hands if the master is familiar with the basics of electrical engineering and soldering. The final result depends on the skills of the performer.

Working nuances

To do do-it-yourself magnetic stirrer, you first need to create an electrical power circuit for the future unit. In order to prevent the most common mistakes, you must use the classic scheme. After high-quality soldering of the circuit, adjust the potentiometer to the specified parameters. Only then can we begin to install the magnets in the body of the laboratory stirrer. To do this, drill a small hole in the center of the aluminum circle. Neodymium magnets are attached to the sides, and a pulley from the motor is mounted.

In the next step, you can assemble all the details in a single design. For fixing, you can use ordinary bolts. In order for the container to be held firmly in place during shaking, a small magnet must be attached to the bottom. The product must not react with acids or other reagents. At the final stage, the unit is tested. It is worth noting that the most responsible way is to choose the anchors for the magnetic stirrer. You can make a high-quality and durable product with your own hands.

Assembly rules

Make a magnetic stirrer from improvised materials can be in just 1-2 hours. The first step is to connect two magnets to the cooler. They must be parallel to each other so that the poles are opposite. It is necessary to use glue, but if it is not, then ordinary tape is suitable. Since the fan will become higher due to the magnets, you need to level the height of the site. Classic cooler bolts are suitable for operation.

The plastic case from under the disks is ideal as the main surface, and the iron clip with insulation is used as the stirrer. Then you can turn on the magnetic stirrer. To supply power, you need only two wires. Dishes for liquids must be flat. When the water is filled in, you need to install a paper clip.

Expert advice

If the work of the laboratory is aimed at conducting in-line analyzes using sensitive samples, growing or dissolving various microorganisms in nutrient media, then you need to think about invention of a universal multi-seat magnetic pre-heated stirrer. Such plants can be purchased in specialized stores, but their cost is quite high.

Large research laboratories and centers that are engaged in the production of completely new products require the purchase of a multi-functional overhead drive mixer with various nozzles. You can’t do without a powerful installation in the process of making sugar syrup, creams, gels and even cement mortar.



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