Macrofab Engineering Podcast

MEP EP#246: Doing Something MagicalParker 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 e