Add Yahoo as a preferred source to see more of our stories on Google. This USB clock fan simultaneously keeps you cool and on schedule. The ONXE USB LED Clock Fan plugs into any USB port to create a ...
To add our USB power port, we'll steal some DC voltage from the clock. We are going to run power through a LM 7805 voltage regulator to take it down to 5 volts. Adding a 220uF capacitor between the ...
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