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Physicists build circuit that generates clean, limitless power from graphene
University of Arkansas physicists
Energy harvesting the thermal motion of graphene
Without getting all quantum about it, it seems to work by configuring the graphene as one electrode (or both) of a capacitor. As the graphene flaps in the breeze (actually Brownian motion, I assume), the changing geometry will change the capacitance.
The team's next objective is to determine if the DC current can be stored in a capacitor for later use
Youtube video
Stephen
New test equipment design - picking the right opamp
Current sensing with a bit of a twist
Powered by +/-12V
Need to read current on the +12 and the -12 along with a +9V rail
Opamp needs to be capable of reading a voltage drop in an environment where the common mode voltage is at or near the opamp supply voltage
Current sense amplifiers
INA1x9 series amplifiers from TI
Supply and common mode range are independent of each other
2.7v to 60v
Convert a voltage to a current then change the gain by selecting an appropriate load
Iphone 12 doesn’t come with a charger?
Are chargers necessary?
Don't we have like 300 of them lying around?
Apple states environmental reasons for dropping the charger
Also no earbuds
Examples of other products that lack the equipment necessary to function