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Introduction

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.

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). The Eagle PSU works with turntables fitted with a 50Hz or 60Hz pulley (front panel selectable).

The Eagle PSU can be connected directly to the RoadRunner digital turntable tachometer via a 3 wire serial cable in order to synchronize its output with the direct measurement of the platter speed. Operation is completely automatic with no user intervention needed. The tachometer outputs the speed reading once per revolution. The PSU compares this reading to the speed on the display and can make micro-fine adjustments to the output frequency to lock the turntable speed to within ±0.005 RPM. The adjustment is done slowly and evenly over the entire next revolution and is inaudible to the listener (in most cases, the adjustment is <0.0005 RPM per step). The turntable remains on speed independent of the belt tension, bearing oil viscosity, drag from the needle or any other variables that cause the table to drift over time.

Tha 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.

Eagle PSU
High Power
Digital TurnTable Power Supply

  • Powers any AC Synchronous motor of 15W 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: 3.5”L x 2.5”W x 1.2”H Amp: 6”L x 4”W x 2”H

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.

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 2 pieces: The controller contains all
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).

The Eagle PSU can be connected directly to the RoadRunner digital turntable tachometer via a 3 wire serial cable in order to synchronize its output with the direct measurement of the platter speed. Operation is completely automatic with no user intervention needed. The tachometer outputs the speed reading once per revolution. The PSU compares this reading to the speed on the display and can make micro-fine adjustments to the output frequency to lock the turntable speed to within ±0.005 RPM. The adjustment is done slowly and evenly over the entire next revolution and is inaudible to the listener (in most cases, the adjustment is <0.0005 RPM per step). The turntable remains on speed independent of the belt tension, bearing oil viscosity, drag from the needle or any other variables that cause the table to drift over time.

Music Hall Pro-Ject VPI
Feature Eagle Cruise Control SpeedBox SDS
Power Output 15W 3W 3W 20W
Speed Adjust Resolution 0.01 RPM 0.1 RPM 0.1 RPM 0.01 Hz 1
Soft Start (Ramps Speed) Yes No No No
Starts in 45 RPM mode Yes No No Yes
External Tach Option Yes 2 No No No
Built In Speeds 33/45 33/45 33/45 33/45
Reduced Voltage Output Yes No No Yes
Calibration Modes Yes No No No
50/60Hz Pulley Operation Yes 3 No No No
115/230VAC Output Yes 4 No No No
Retail $525 $299 $599 $1199
1 Depending on the pulley/spindle you use, 0.1 RPM=0.18Hz, 0.13333 Hz , 0.15Hz or 0.11111Hz
2 RoadRunner tach synchronizes turntable speed to ±0.005 RPM regardless of belt tension, slippage etc.
3 Front Panel Selectable


 

 


Owners Manual