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Mega Power Bank
DIY HiFi Gainclone Power Amplifier (2x68w, Class AB-A, LM3886)
Make a simple AM transmitter
Simplest Wireless Electricity Transmission Experiment
TylerV11, if you look on step six, you will see that the 3rd pin is grounded. The "body" (or heat sink part with the big hole) does not need to be grounded.