● AC voltage stabilizer based on waveform shaping technology ● Acts as asource of extremely clean energy ● Low-distortion reference waveformgenerator ● Highly effective waveform compensation ● Outstanding current
capability ● Superb interference rejection ● Built-in meter for monitoring fivevital parameters: output power, input/output voltage, input/output distortion● Elaborate protection features ● Large “Max Ring” toroidal transformer

The photograph shows the 230 V version.

Tap into a totally clean source of AC energy – Revolutionary waveform
shaping technology enables highly precise compensation, creating a pureenergy source of 230 V AC (or 120 V AC) ±2% with max. 0.22% THD.
Connect audio or video equipment for a drastic improvement in soundand picture quality. Monitor output power (VA), input/output voltage(V), and input/output distortion (%) on the built-in meter.
The Clean Power Supply components fromAccuphase are revolutionary products that remove
noise and impurities from the AC power line andimprove signal quality by continually monitoringand shaping the power supply waveform. They
have been widely acclaimed for drastically
improving the sound and picture quality of audio
and video equipment. The PS-1210 is an upgradedversion that incorporates the latest MCS+ circuit
topology in the waveform compensation amplifier
section. The reference signal generator features
further improved accuracy to assure the lowest
possible distortion in the output waveform.
Because the PS-1210 can deliver as much as 1200
VA (230 V AC version) or 1000 VA (120 V ACversion), it covers the requirements of almost any
high-quality A/V system currently on the market.

The PS-1210 uses waveform shaping technology
to turn the power from a regular AC outlet into ahighly pure sine waveform for use as a stable anduncontaminated energy source of A/Vcomponents. To achieve this, the PS-1210 takes
the power source waveform and compares it to ahighly accurate and stable reference waveform.
Based on this comparison, it then adds or subtracts
exactly the required amount of correction. The
compensation required by this innovativetechnique typically is only a fraction of overall
power. The PS-1210 therefore operates with highefficiency and produces little heat, allowing it tobe designed as a fairly compact and lightweight
unit. Since all circuitry is analog and there are nooscillators or switches, the PS-1210 itself does not
act as a source of spurious high-frequency noise.

Power Supply Waveform and Clean PS-1210 Output Waveform
Almost all electrical devices used in a household convert the AC
supplied by the outlet into direct current for powering internal circuits.
This task is performed by a rectifier. As shown in photograph a, therectifier load current has a pulse waveform with a large current flowing
momentarily in the vicinity of the voltage peak. This causes a voltage
drop, resulting in clipping of the voltage waveform, as shown inphotograph b. A clipped waveform with a high amount of distortion
contains many unwanted frequency components, or harmonics, asshown below. When entering the audio circuitry of an amplifier throughthe power supply, such harmonic components can interfere with theaudio signal and cause intermodulation distortion, which has a highly
detrimental effect on sound quality. When passing through thePS-1210, the deformed waveform is restored to its original sine wave
pattern (see frequency spectrum in the graph below). The result is aclean sine waveform as shown in photograph c.
AC LINE POWER

[dB]
0.0

Photo b Voltage waveform of AC line
(distortion approx. 3%)

PS-1210 OUTPUT POWER[dB]
0.050Hz

Photo a Current waveform ofrectified load

AC Voltage Stabilizer Based on Waveform Shaping
TechnologyThe PS-1210 accepts AC power on the input side,processes it using internal control circuitry, and supplies
it as clean AC power on the output side. Most of the ACenergy from the input is carried over to the output. Theloss introduced by the PS-1210 is very small, since itconsists only ofEffi- Input
power
the power re- ciency[%] [ VA]
1800
quiredfor
80 1600
waveform
Efficiency
1400
compensation.
60 1200
As shown in
1000
40 800Figure 1, theInput/output power600
signal from the20 400
secondary200
winding S 1 of800
1000 1200
0200
400600
the transformer
Output power [VA]
Output power/input power (efficiency)
reaches thecharacteristics
THD
adding/sub[%]
0.8
tracting circuit
and appears at0.6
the output as
output voltage
0.4(e 0). The S 20.2
signal from thet ra n s fo r m e r
800
1000
12000200400600
goes to the refOutput power [VA]
erence signal
Output power/THD characteristics
generating cirFig. 2 PS-1210 Load Characteristics
cuit where it
becomes the high-precision sine waveform (e i )synchronized to the input frequency of 50/60 Hz. Thisreference sine wave (ei) is then used as reference signal
to be compared to the output voltage. The differential
component is extracted and used by the adding/
subtracting circuit to provide exactly the required amountof compensation for turning the output into a highprecision sine waveform.

Highly Effective Interference Rejection

50Hz-25.0

-25.0

-50.0

-50.0

-75.0

-75.0

-100.00-100.00

10k20k[Hz]

Frequency spectrum of power line (photo b )10k20k[Hz]

Frequency spectrum of PS-1210 output (photo c )Frequency spectrum of power line
Photo c PS-1210 output waveform(distortion approx. 0.2%)

Meter selector

Alarm indication
circuitMeter

Adding/subtracting circuit
RectifierBuilt-in Meter Allows Monitoring of 5 Parameters:
Output Power, Input/Output Voltage, Input/Output
DistortionThe meter of the PS-1210 lets the user see at a glance
how much power (VA) the connected equipment isconsuming at any given time. This is especially helpful
for components such as integrated amplifiers or power
amplifiers whose power consumption differs considerably
depending on the volume setting and actual music signal.
When the maximum rated output power (1200 VA) isexceeded, the meter illumination flashes as a warning
indication.

Line filter
Error
detector

Waveformcomparator

The input side of the PS-1210 is equipped with a line
filter for removing any high-frequency noise components
present in the power line, such as generated by digitalequipment. The primary and secondary windings of thepower transformer are kept totally separate, and the fully
shielded design shuts out any externally induced noise.
Since the amplifier uses the feedback principle, output
impedance is extremely low. This prevents any possibilityof mutual interference between components connectedto the outputs of the PS-1210.

Waveformcompensation
amplifier

Reference signal
generator
Fig. 1 Operation Block Diagram of PS-1210
Meter of 230 V AC version

Assembly with input voltage/
distortion monitoring circuitry

Compensation Amplifier Based on High-Precision Reference Signal Creates Pure 230 V (or 120 V) AC Source
Note: The explanation is for the 230 V AC version of the PS-1210. Figures in brackets refer to the 120 V AC version.

■ Low-Distortion Reference Signal Generator
The waveform of the signal detected at the S2 winding of the power transformer (seeFig. 1) is used by a highly precise Zener diode circuit to generate a square waveform.
A newly developed 50/60 Hz bandpass filter and band-stop filter are then applied tothe waveform. The filter frequency isswitched in sync with the input
frequency, for automatic 50 Hz and
60 Hz support. By routing the signal
through another bandpass filter, alow-distortion sine wave (referencesignal) is created that is notdependent on the input voltage.
■ Assembly with reference signal generator and other circuitry[50 Hz]Fromsecondarywinding ofpowertransformer

Bandpass
filter

Band-stop
filter
Bandpass
filterSquare wavegenerator[60 Hz]Bandpass
filter

Reference Signal Generator Block Diagram

Band-stop
filter

Referenceoutputwaveform■ Superior Waveform Compensating Power
When the input voltage is 220 V (110 V), the voltage at the secondary side of the transformer will
also be 220 V (110 V). To bring this to 230 V (120 V), 10 volts must be added, as shown in Figure (a).
Conversely, if the input is 240 V (130 V), 10 volts must be subtracted to yield 230 V (120 V), asshown in Figure (b). (As the figures show, in actual operation, the peak value of 10 V, namely
14.1 V, is added or subtracted.) The sine wave (ei) synchronized to the input frequency and theoutput voltage (eo) arecompared, and for any
PS-1210230/120 V AC
excessive or missing
output waveform
14.1 V+170/+170/
component, a compen325 V
240/130 V
325 V
14.1 VAC input
sation waveform up to awaveform
PS-1210
maximum of ±10 V (peak220/120 V
230/120 V
AC input
AC output
value ±14.1 V) is generwaveform
waveform
00tt
ated and imposed on theoutput voltage. Consequently, for an input volt14.1 V-170 /-170/
age range of 200-253 V325 V
325 V
14.1 VAC (108-132 V AC) at therated load of 1200 VA
Compensation
Compensation
waveformwaveform(1000 VA), the output+14.1V+14.1 V
voltage is kept cons tant00tt
at 230 V ±2% (120 V ±2-14.1 V-14.1V%), with a maximum distortion ratio of 0.22%.
(a) If power source voltage is(b) If power source voltage is higher
lower than 230 V (120 V),
than 230 V (120 V), subtraction is
These values demonadditionisperformed
performed
strate the outstanding
waveform compensation
Waveform Shaping Principle of PS-1210
ability of the PS-1210.

Excellent Current Capability
The power amplifier which performs waveform compensation uses the current feedback
principle for excellent high-frequency phase characteristics and operation stability.
This is combined with the MCS+ circuit renowned for superior performance and soundquality. The output stage uses 20 transistors rated for a maximum current of 15 amperes.
These devices are connected in a parallel complementary push-pull arrangement
which boasts a rated output current of 5.2 A (8.3 A) and an instantaneous peak current(inrush current) rating of 60 A (120 A). This demonstrates the excellent current capabilityof the PS-1210.
b Assembly with waveform compensation amplifier for addition/subtraction, output stage
with 20 parallel push-pull power transistors mounted to two large heat sinks, waveformcompensation amplifier, etc.

The photograph shows the230 V version.

Multiple Protection Assures Total Operation Safety
If a problem occurs during operation, the circuit breaker immediately
shuts off the power, to protect the unit and any connected components
from possible damage.
a When the combined load of connected equipment exceeds the maximum rated output power (1200 VA),
the meter illumination flashes as awarning indication.
b When input current overload occurs,
the circuit protector shuts off thepower. Reduce the connected load
and turn power on again.

d When DC voltage is detected in the output due to an operation
problem or when the output voltage exceeds the maximum rating, the output is switched off to protect connected components.
e When the temperature of the internal heat sink or power transformer becomes too high due to prolonged use at rated power,
the circuitry is automatically shut down.
Gold-plated parts

Strong Power Supply With Large “Max Ring” Toroidal Transformer and Four High-Quality 22,000 µF Filtering Capacitors

Assembly with protection circuitryc In case of momentary power overload such as caused by inrush
current when a component is switched on or when a power amplifier
reproduces a peak passage in the music, a current limiter becomes
active to ensure safe use.

The power transformer plays a vital role in any power supply. The
PS-1210 uses a large toroidal type rated for 1500 VA. Toroidalpower transformers have large-gauge copper wiring on a donutshaped core, resulting in very low impedance and high efficiency.

PS-1210 Meter (Power) Indication and LoadThe power consumption of electrical equipment, as indicated on the equipment itself andin catalogs and other documentation according to legal requirements, is usually given inwatts (W). This figure represents the so-called effective power. However, the actual powerdrawn by the equipment is larger than the effective power. This is called the apparent
power which is calculated by multiplying the applied voltage (230 V or 120 V) with theactual current. The unit for apparent power is VA (Volt-Ampere).

Meter of 120 V ACversion■ Front panel

High-quality, high-reliability circuit components+(The photograph shows the 230 V version.)

Since the value shown by the meter of the PS-1210 is the apparent power, the reading will
beOptionhigherthanthe power
consumption (W) given in catalogs and specification sheets.
board
installation
example● The rated power limit of the PS-1210 is 1200 VA for the 230 V AC version and 1000 VA for the 120 VAC version. When deciding on equipment to be connected, select components so that the totalremains within these limits, and check actual power consumption using the meter.
● In case of overload, the meter illumination flashes. Reduce the load by reducing the number of connectedcomponents until the illumination stops flashing and stays constantly lit.
● The power consumption of integrated amplifiers and power amplifiers varies considerably depending on
the actual audio output. After connecting such equipment, perform playback and verify that power
consumption does not exceed the maximum rating when peaks in the music are reproduced at highvolume levels.

GUARANTEED SPECIFICATIONS
120 V version

230 V version

Rated output capacity

1,000 VA (continuous)

1,200 VA (continuous)

Rated output voltage

120 V AC ±2.4 V

230 V AC ±4.6 V

8.3 A

5.2 A

Output connectors of 120 V AC version■ Rear panel+

Rated output current(The photograph shows the 230 V version.)

Output frequency
Instantaneous peak current capacity

50 Hz or 60 Hz (identical to input frequency)
120 A

60 A

Output waveform THD
Rated input voltage

0.22% or less
120 V AC

Input frequency230 V AC
50 Hz or 60 Hz

No-load power consumption

60 W

Cooling principle

Natural air cooling

Meter
VOLT-AMPERE+

The usable power supply
voltage is indicated here.

VOLTAGE INPUT/OUTPUT(green zone of scale)0-1200 VA
The meter illumination flashes when an overload occurs.
120 V AC ±5%

DISTORTION INPUT/OUTPUT
D Output connectors (AC outlets)+
E AC power connector+

A Meter (Output power, input/output voltage, input/
output distortion)+

0-6%

Maximum Dimensions

Width 465 mm(18-5/16")
Height 243.4 mm (9-9/16")
Depth 500.2 mm (19-11/16")

Mass

38.9 kg (85.8 lbs.) net
48.0 kg (105.8 lbs.) in shipping carton

B Power switch/circuit protector
C Meter operation selector buttons
VOLT AMPERE (VA), VOLTAGE INPUT/OUTPUT (V)DISTORTION INPUT/OUTPUT (%)

230 V AC ±5%

Remark+ The 230 V AC and 120 V AC versions of the PS-1210 differ regarding meter voltage indication, AC output connector shape, supplied power cord, etc. Make sure that you have the correct version.
21RCaution✽ The PS-1210 is available in 230 V AC
21 and 120 V AC versions. The actual allowable voltage is indicated next to the AC power connectors on the rear panel. Be sure
to check this indication before using the PS-1210.
✽ This product can be used only on a regular household AC circuit rated for 230 V or 120 V AC, 50/60 Hz. Using the product with portable AC generators, airplane or ship
power generators or other types of power sources is not possible.
✽ This product is designed to improve the quality of AC power supplied to audio or video components. Do not use it to power industrial type equipment or common
household electrical appliances.
✽ Do not use this unit for powering equipment where failure incurs a risk of injury or fatal accidents (medical equipment, aviation equipment, traffic control equipment,
furnace and heating control equipment, safety devices, etc.). Accuphase will not be liable for any problem occurring due to use of the PS-1210 with the above type ofequipment.

■ Supplied accessories:• AC power cord

• Specifications and design subject to change without notice for improvements.

http://www.accuphase.com/L0505Y

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