An energy transductor is a piece of technology of Decepticon design that works by manipulating energy storms and generating it into a wave like pattern that surrounds the structure that the energy transductor is housed in. This energy storm prevents anything from approaching the device.
Generation One cartoon continuity
The Constructicon built an energy transductor for Megatron and housed it on a tower on the Sky Platform. Megatron planned to use the device to manipulate Earth's electromagnetic field and convert it into Energon, however, he required an Energy Formula from the head of Hybrid Technologies. The device was destroyed by Astoria in order for her to save Powerglide from the energy storm that was damaging him.