EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: graybeard on December 14, 2022, 06:35:25 pm
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https://www.youtube.com/watch?v=hFFM31IMISw (https://www.youtube.com/watch?v=hFFM31IMISw)
I bought this IKA C-MAG HS 4 magnetic stirrer at an industrial auction. When I got it home the motor was not working so I took it apart, cleaned it, and lubed the bushings. When I put it back together it worked.
Out of curiosity I put a Rayovac AA battery on it and started it and turned it up to high. The battery started spinning rapidly.
When I took as video of the spinning battery it appears to be spinning slowly. However it is not. The appearance of the slowly spinning battery is a result of the shutter rate of the video being close to the rotational rate of the battery.
I does look "cool." So I decided to share it here.
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Ever since the invention of cinema, audiences have become used to the retrograde artifact in the undersampled wagon wheels in cowboy movies.
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That seems to be a fairly complex method of enhancing battery leakage :-DD
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I see that some Li cells do voltage jumps and realized that movement has a influence, I guess the liquid electrolyte need to wet all surfaces. This treatment might literally shake things up.
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Seems to be a good way to damage the coating on your heater/stirrer plate and get corrosion in the future, assuming you use it for real work....
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For every revolution of the battery, the camera captures a frame at a slightly different position to the last frame, because the rotation speed of the battery and the shutter speed of the camera are different. If the shutter speed were were the same as the rotation speed of the battery, the battery would appear still. This is connected with beat frequency.
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Might be fun to work up some unusual geometry objects, rattlebacks for example, and watch them spin on the stirrer.
Nice find on the stirrer. I assume you got a good deal.