Ferrofluid , ferrofluid, ferrofluid - liquid strongly polarized in the presence of a magnetic field, a material developed by NASA in 1960. It was used as fuel for spacecraft and as a sealing material.
Ferrotec supplies EFH-1 for educational purposes. An American craftsman decided to make a device with a ferromagnetic liquid, which is modulated by sound from a speaker, this is what came of it:
Below the cut - a few pictures of the creation process.
Ferrofluid model EFH-1 from Ferrotec.
Ferrofluid adheres well to glass, therefore special processing was required.
MSGEQ7, which is a 7 band filter for graphic equalizer. This 8-pin chip is able to extract the frequency bands 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz from the input audio signal:
