A critical (and suspicious) part of the design; Kapanadze claims the device "pumps" energy from the earth through this connection. Frequency Stabilizer:
Many setups require two separate earth connections—one for the initial battery/inverter and another for the secondary coil—to act as an "active" part of the energy transfer. Scientific Controversy and Skepticism kapanadze free energy generator schematics
An initial power source (often a battery and inverter) feeds a high-voltage transformer, creating high-frequency pulses across a spark gap. A critical (and suspicious) part of the design;