Here is a fun way to keep cool at your desk this summer, with the USB Fan and Thermo Clock. The USB Fan and Thermo Clock features a built-in clock with a calendar function as well as a thermometer ...
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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