@Marseye,
thank you for the kind greetings and the recommended link about the RE!
Today I found some small (only 40 mm sized, 12V, 1W and 0.9W, "impedance protected" as their labels shows) old CPU cooler fans, I have tried to "transform" by the usual way; the only pity that there were no posts at all: the wires were soldered to the control panel directly. Even, there are no the usual four-armed (cross-like) iron plate core with four coils - only a single cylindic coil is there (bifilar, I guess, as there are four small wires coming out from it), located axially, and there are two thin iron plates (the core, I guess) one is below and one is above the coil.
Do you have some experience/idea about this kind of fan? Could it be better, or worse than the "usual" fans? (If you find it better, that will have a very bad consequence for me, as the wires are very short and thin.
)

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