Phoenix Engineering Eagle 25 Watt PSU Turntable Speed Controller

Description

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.

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 Absolute Sound Eagle & RoadRunner Review Link

Eagle PSU Owners Manual Link

Eagle Comparison Chart: Music Hall Cruise Control,
Pro-Ject Speed Box, VPI SDS

Feature	Eagle	Music Hall Cruise Control	Pro-Ject SpeedBox	VPI SDS
Power Output	25W	3W	3W	20W
Speed Adjust Resolution	0.01 RPM	0.1 RPM	0.1 RPM	0.01 Hz1
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

• 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:
  3.5”L x 2.5”W x 1.2”H Amp: 6”L x 4”W x 2”H