Phoenix Engineering Eagle 25watt Hi-Power PSU Turntable AC Speed Control 100-240v The Eagle Power Supply Unit (PSU) is a microprocessor controlled digital regenerative AC power source used for accurate speed control of a turntable motor. The PSU uses Direct Digital Synthesis (DDS) to create an extremely accurate and clean sine wave that improves motor speed stability and allows the user to precisely adjust the turntable platter rotational speed. Powers any AC Synchronous motor of 25W or less. Speed Adjustment 1.0 RPM in 0.01 RPM steps. Automatic Voltage Reduction when platter reaches speed. Soft Start ramps speed to prevent belt Burn Out. Can start in 33 or 45 RPM mode. Works with 50Hz or 60Hz pulleys. Calibration modes for Speed and Voltage Output. Direct connection to RoadRunner Digital Tachometer. Controller: 3.5L x 2.5W x 1.2H Amp: 6L x 4W x 2H The Eagle comes with a universal input (100-260VAC) wall adapter with 6ft AC power cord, a 6ft cable to connect the controller to the amplifier and a standard NEMA 5-15 (North American 3 prong) socket on the front panel of the amplifier for the output. The PSU is extremely easy to use and set up. All of the operating parameters are stored in non-volatile memory and the device always power up with the last used speed and frequency offset displayed. The PSU comes as two pieces: The Controller contains all of the frequency generation, logic, display, user and tachometer interface, and the remote amplifier boosts the signal from the controller to the mains voltage level (jumper selectable output of 115VAC/230VAC).