Diy magnetic mixer

When mixing or agitating delicate solutions in the chemistry lab, a magnetic stirrer is often the tool of choice.

I needed a magnetic stirrer to keep some cells agitated for cell culture, but didn't want to spend the thirty or so dollars needed to buy one. This magnetic stirrer uses an old computer fan and some cheap neodymium magnets with a moldable plastic stir bar. Prepare and clean the fan for use. Your fan may have two wires red for positive and black for negative. If it has three wires, the white wire is a tachometer and is not needed.

Diy magnetic mixer

A magnetic stirrer is a handy item to have at hand for a range of applications, including agitation, dispersion, and dissolution. We did some digging to find out and discovered there are quite a few viable options available. While a home-made stirrer is unlikely to give you the power and speed control of professional-grade equipment, it could be sufficient for some applications. An online search will provide you with several different types of magnetic stirrer designs. We take a look at some of those here, making note of some of the advantages and drawbacks of each design. This set of instructions uses a fan-based setup. The main component of the stirrer is an old computer fan with magnets glued to it. One of the trickiest tasks is mounting the magnets correctly. One magnet should have its north facing upwards and the other its south facing upwards. The magnets should be positioned directly across from each other. Because the motor contains magnets, it can be difficult to align the two magnets such that there is minimal vibration when you switch the fan on.

If you take a normal electromotor you can regulate the RPM diy magnetic mixer by a simple one transistor current regulator that takes just a few minutes of work did this and used the home-built stirrer for years.

This instructables is to show how to build your own magnetic stirrer from parts you may have at home. This one was built to mix E-cigarette vape juice. You could use it to stir almost any liquids, so it can be used for mixing vape juice, mixing for cooking, or in a chemistry lab. Box - anything square ish and preferably plastic in case something comes loose. That is a fan from a donated junk computer. You can use a case fan or power supply fan.

I needed a magnetic stirrer to keep some cells agitated for cell culture, but didn't want to spend the thirty or so dollars needed to buy one. This magnetic stirrer uses an old computer fan and some cheap neodymium magnets with a moldable plastic stir bar. Prepare and clean the fan for use. Your fan may have two wires red for positive and black for negative. If it has three wires, the white wire is a tachometer and is not needed. Glue the magnets on opposite sides of the fan head. The magnets in the fan's motor may push the magnets around a bit, so arrange accordingly.

Diy magnetic mixer

The magnetic stirrer is a useful device for any home scientist; it is effective, cost-efficient, and is easy to make and use. The DIY magnetic stirrer attracts a lot of attention, but is often disregarded as being too difficult to make, usually because of the potentiometer used to control stirring speed, and the challenge one faces in calculating the right potentiometer to use. In this Instructable, we will not use a potentiometer , and will still be able to control stirring speed. The stirring action is achieved through magnetism. Inside a project box, there are two magnets glued to a fan which spins, powered by the 12V DC power supply, and controlled by resistors on a rotary switch. Above the lid of the project box, a beaker sits, and inside the beaker, a magnetic stir bar is placed. The magnetic stir bar corresponds with the magnets inside the project box, and will move as the magnets on the fan move, as it is attracted to the poles of the magnets.

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Besides, choosing a PC cooling fan as the electromotor and the PC power source is far from optimal. This design provides a fairly high-speed stirrer, but the creator suggests that adding a voltage regulator could allow you to reduce the minimum speed if necessary. Eh, those super cheap hotplates are pretty crappy. Put the power cord through the hole in the back of the box, and tie a knot in it so it won't pull back through. Cut the connector off the power cord. Detail: A cheap plastic bowl was used as this 'upper surface': glued: and this was glued above an old ATX PC power supply with most of it wires removed. As you can see in the video, it mixes very well. Here's a gallery with more indepth and build pix. In the article " Back-EMF Motion Feedback " the author describes a process where a motor is momentarily allowed to spin freely in order to take a voltage reading in order to correct the motor speed. I know that Neodymium magnets will react with a lot of chemicals. Thanks Nicodem, actually this is so obvious that I didnt noticed. This magnetic stirrer uses an old computer fan and some cheap neodymium magnets with a moldable plastic stir bar.

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I recommend both the power switch and knob are both on the front for easy access. The stir bar used in this instance comprises four magnets, a small piece of plastic, and some tape. They don't normally mix. Reference the provided diagram. Make sure the chosen fan can spin freely with the magnet on. I chose based on the physical connections. Cybo… More About alexngai ». Any thoughts? When mixing or agitating delicate solutions in the chemistry lab, a magnetic stirrer is often the tool of choice. Next step was tight winding PTFE tape on it. Search Search for:.