I opened some Portable Battery operated DC Fans and the checked the parts used before. This
time I opened a cheap (looks cheap) Genetic (No brand) Desk Top Fan. HK$125 (US$16).
As this uses USB power (5V DC 1A 5W) no battery is used the
circuit is simple and the cost is low and Motor and LED
control by one IC (no brand). Four square LEDs are not used in this model. So this may be a budge version.
Still you can see two MOSFETs, one Schottky and one coil for motor
drive.
MOSFET 2300 seems very cheap, may be less than US$0.01 now.
sptt
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