Power Supply

Aug 17
2011

SORENSEN DCR 150 3B 0 200V 0 5A
SORENSEN DCR 150 3B 0 200V 0 5A
$250.00
Time Remaining: 15h 2m

New 5V DC 10A 50W Regulated Switching Power Supply
New 5V DC 10A 50W Regulated Switching Power Supply
$14.99
Time Remaining: 11d 9h 24m
Buy It Now for only: $14.99

SORENSEN DCR 150 3B 0 200V 0 5A VARIABLE REGULATED DC
SORENSEN DCR 150 3B 0 200V 0 5A VARIABLE REGULATED DC
$50.00
Time Remaining: 15h 7m

NEW AC100 240V to 12V DC 12A 145W Regulated Switching Power Supply
NEW AC100 240V to 12V DC 12A 145W Regulated Switching Power Supply
$24.99
Time Remaining: 11d 9h 19m
Buy It Now for only: $24.99

SIEMENS 6EP1961 3BA10 MELDMODULE
SIEMENS 6EP1961 3BA10 MELDMODULE
$50.00
Time Remaining: 3d 21h 22m

ALLEN BRADLEY 1606 XLE240E 1606XLE240E NEW NIB 24V POWER SUPPLY 240W
ALLEN BRADLEY 1606 XLE240E 1606XLE240E NEW NIB 24V POWER SUPPLY 240W
$277.30
Time Remaining: 20d 19h 2m
Buy It Now for only: $277.30

Allen Bradley 1746 P1 power supply and 1746 A4 PLC Rack
Allen Bradley 1746 P1 power supply and 1746 A4 PLC Rack
$95.00
Time Remaining: 1h 3m
Buy It Now for only: $175.00

Okuma Power Supply E0451 521 051 Version V15 E0451521051
Okuma Power Supply E0451 521 051 Version V15 E0451521051
$620.00
Time Remaining: 29d 20h 25m
Buy It Now for only: $620.00

HDR Power Supply ZF2 480 40 C 3 Phase 480 VAC  3497
HDR Power Supply ZF2 480 40 C 3 Phase 480 VAC 3497
$39.99
Time Remaining: 1h 20m

Volgen ESK50U 1212A Power Supply 49W
Volgen ESK50U 1212A Power Supply 49W
$20.00
Time Remaining: 10d 17h 51m
Buy It Now for only: $20.00

NEW ACME STANDARD POWER SUPPLY  SPWS 2436 NIB
NEW ACME STANDARD POWER SUPPLY SPWS 2436 NIB
$99.99
Time Remaining: 1h 24m

Power One 24 V Power Supply  HN24 36 A Used WARRANTY
Power One 24 V Power Supply HN24 36 A Used WARRANTY
$10.00
Time Remaining: 17d 2h 33m
Buy It Now for only: $10.00

SOLA ELECTRIC Regulated Constant Voltage Power Supply Transformer
SOLA ELECTRIC Regulated Constant Voltage Power Supply Transformer
$49.99
Time Remaining: 1h 36m

7pcs 2w025 08 DC12V 2pcs S 350 12V POWER SUPPLY 2pcs REX C100 with K type coupl
7pcs 2w025 08 DC12V 2pcs S 350 12V POWER SUPPLY 2pcs REX C100 with K type coupl
$199.99
Time Remaining: 28d 9h 31m
Buy It Now for only: $199.99

NEW Phoenix Contact MINI PS 100 240AC 5DC 3 Power Supply More Photos In Listing
NEW Phoenix Contact MINI PS 100 240AC 5DC 3 Power Supply More Photos In Listing
$74.99
Time Remaining: 2h 40m
Buy It Now for only: $82.99

1746 P2 C Allen Bradley SLC 500 Power Supply 1746P2
1746 P2 C Allen Bradley SLC 500 Power Supply 1746P2
$89.00
Time Remaining: 8d 51m
Buy It Now for only: $89.00

Omron S82K 05024 24V 21A Power supply
Omron S82K 05024 24V 21A Power supply
$30.00
Time Remaining: 2h 44m

Allen Bradley Compact I O Power Supply 1769 PA4
Allen Bradley Compact I O Power Supply 1769 PA4
$250.00
Time Remaining: 28d 23h 7m
Buy It Now for only: $250.00

Sola SLS 24 024T 24V 24A Power Supply
Sola SLS 24 024T 24V 24A Power Supply
$15.00
Time Remaining: 2h 44m

WARNER ELECTRIC MODEL CBC 801 1 POWER SUPPLY NEW CBC8011
WARNER ELECTRIC MODEL CBC 801 1 POWER SUPPLY NEW CBC8011
$55.00
Time Remaining: 27d 3h 13m
Buy It Now for only: $55.00

Sola Power Supply 5VDC 30 Amps 83 05 230 2
Sola Power Supply 5VDC 30 Amps 83 05 230 2
$9.99
Time Remaining: 2h 47m

Lg Qty New Lutze 722754 Power Supply DRA60 24A
Lg Qty New Lutze 722754 Power Supply DRA60 24A
$157.50
Time Remaining: 29d 1h 44m
Buy It Now for only: $157.50

SIEMENS POWER SUPPLY NEW IN BOX 6ES7307 1KA01 0AA0 E STAND VER 1
SIEMENS POWER SUPPLY NEW IN BOX 6ES7307 1KA01 0AA0 E STAND VER 1
$150.00
Time Remaining: 3h 40m
Buy It Now for only: $200.00

OKUMA OPUS 5000 RLP Power Supply E0451 521 046
OKUMA OPUS 5000 RLP Power Supply E0451 521 046
$1,085.00
Time Remaining: 29d 20h 29m
Buy It Now for only: $1,085.00

PULS ML15121 Power supply
PULS ML15121 Power supply
$24.99
Time Remaining: 3h 49m

Integrated Power Designs Power Supply CE 300 1004 6A
Integrated Power Designs Power Supply CE 300 1004 6A
$9.99
Time Remaining: 4h

Modicon Cyberline 110 108 Power Supply PLS4 UVG
Modicon Cyberline 110 108 Power Supply PLS4 UVG
$80.00
Time Remaining: 8d 4m
Buy It Now for only: $80.00

20A ACS712 Current Sensor Module Detector 20 Amps Amperage Range 5V Power Supply
20A ACS712 Current Sensor Module Detector 20 Amps Amperage Range 5V Power Supply
$3.36 (8 Bids)
Time Remaining: 4h 18m

Allen Bradley 1606 XL 1606 XL240EP Power Supply DIN Rail 24V 28V 240W 10A
Allen Bradley 1606 XL 1606 XL240EP Power Supply DIN Rail 24V 28V 240W 10A
$149.99
Time Remaining: 13d 9h 19m
Buy It Now for only: $149.99

PULS power supply QS10241 100 240vac 24 28vdc 10 amp
PULS power supply QS10241 100 240vac 24 28vdc 10 amp
$25.00 (1 Bid)
Time Remaining: 4h 26m

NEW AC100 240V to 12V DC 29A 350W Regulated Switching Power Supply
NEW AC100 240V to 12V DC 29A 350W Regulated Switching Power Supply
$38.00
Time Remaining: 11d 9h 24m
Buy It Now for only: $38.00

Kollmorgen power supply PSR4 5A 212
Kollmorgen power supply PSR4 5A 212
$699.00
Time Remaining: 4h 42m
Buy It Now for only: $799.00

FEC ENP 5825 250W Switching Power Supply P N RD9000PH0178
FEC ENP 5825 250W Switching Power Supply P N RD9000PH0178
$79.99
Time Remaining: 28d 19h 17m
Buy It Now for only: $79.99

Rexroth Indramat power supply HVR032 W045N
Rexroth Indramat power supply HVR032 W045N
$3,149.00
Time Remaining: 4h 43m
Buy It Now for only: $3,500.00

NEW AC100 240V to 5V DC 25A 145W Regulated Switching Power Supply
NEW AC100 240V to 5V DC 25A 145W Regulated Switching Power Supply
$24.99
Time Remaining: 11d 9h 19m
Buy It Now for only: $24.99

24V Power Supply
24V Power Supply
$9.99
Time Remaining: 5h 2m

Astrodyne MSCA 0305 Power Supply Module
Astrodyne MSCA 0305 Power Supply Module
$39.00
Time Remaining: 26d 21h 4m
Buy It Now for only: $39.00

IDEC 24VDC POWER SUPPLY
IDEC 24VDC POWER SUPPLY
$10.00
Time Remaining: 5h 13m

SQUARE D SY MAX SYMAX 8005 EPS 50 EXPANSION POWER SUPPLY 11 240 VAC NEW
SQUARE D SY MAX SYMAX 8005 EPS 50 EXPANSION POWER SUPPLY 11 240 VAC NEW
$200.00
Time Remaining: 21d 20h 38m
Buy It Now for only: $200.00

Mean Well MW SP 200 5 200watt 5v Enclosed Switching Power Supply
Mean Well MW SP 200 5 200watt 5v Enclosed Switching Power Supply
$15.00
Time Remaining: 5h 23m

12V 12A DC Universal Regulated Switching Power Supply
12V 12A DC Universal Regulated Switching Power Supply
$26.59
Time Remaining: 24d 6h 26m
Buy It Now for only: $26.59

OMRON 5VDC POWER SUPPLY
OMRON 5VDC POWER SUPPLY
$10.00
Time Remaining: 5h 24m

PAA300F 24 Cosel power supply 24V 14A  NEW  FREE SHIPPING  30day Warranty
PAA300F 24 Cosel power supply 24V 14A NEW FREE SHIPPING 30day Warranty
$74.94
Time Remaining: 27d 19h 58m
Buy It Now for only: $74.94

Low Temperature DC 12V 5A Output Switching Power Supply
Low Temperature DC 12V 5A Output Switching Power Supply
$27.06
Time Remaining: 6h 13m

NEW AC100 240V to 24V DC 6A 145W Regulated Switching Power Supply
NEW AC100 240V to 24V DC 6A 145W Regulated Switching Power Supply
$23.99
Time Remaining: 11d 9h 24m
Buy It Now for only: $23.99

New Sick LCU AMNC RS 7023563 Power Supply
New Sick LCU AMNC RS 7023563 Power Supply
$100.00
Time Remaining: 7h 2m

Allen Bradley 1756 PA75 SEALED 2011 ControlLogix Power Supply 1756PA75 SerB
Allen Bradley 1756 PA75 SEALED 2011 ControlLogix Power Supply 1756PA75 SerB
$599.99
Time Remaining: 12d 5h 27m
Buy It Now for only: $599.99

Allen Bradley 1769 PA2 Power Supply FSB
Allen Bradley 1769 PA2 Power Supply FSB
$224.99
Time Remaining: 7h 8m

15V 5A DC Universal Regulated Switching Power Supply
15V 5A DC Universal Regulated Switching Power Supply
$18.99
Time Remaining: 24d 6h 26m
Buy It Now for only: $18.99

New Moore 15763 201 10 Mycro 352 Controller Board w Power Supply
New Moore 15763 201 10 Mycro 352 Controller Board w Power Supply
$125.00
Time Remaining: 7h 16m

AC 100 120V to DC 12V 125A Switching Power Supply Box
AC 100 120V to DC 12V 125A Switching Power Supply Box
$18.83
Time Remaining: 8h 53m

RHINO INDUSTRIAL POWER SUPPLY PSP24 024S 24W
RHINO INDUSTRIAL POWER SUPPLY PSP24 024S 24W
$29.99
Time Remaining: 29d 2h 3m
Buy It Now for only: $29.99

NIB OMRON POWER SUPPLY 5V DC 06A S82K00305 S82K 00305
NIB OMRON POWER SUPPLY 5V DC 06A S82K00305 S82K 00305
$27.99
Time Remaining: 10h 30m
Buy It Now for only: $34.99

Tectrol Power Supply DC Linear Single Output 5V 3A GHOF 1 5
Tectrol Power Supply DC Linear Single Output 5V 3A GHOF 1 5
$44.00
Time Remaining: 7d 18h 29m
Buy It Now for only: $44.00

OMRON POWER SUPPLY UNIT C200HW PA204
OMRON POWER SUPPLY UNIT C200HW PA204
$5.00
Time Remaining: 16h 17m
Buy It Now for only: $25.00

1746 P1 Allen Bradley SLC 500 Power Supply 1746P1 E65
1746 P1 Allen Bradley SLC 500 Power Supply 1746P1 E65
$49.00
Time Remaining: 2d 22h 11m
Buy It Now for only: $49.00

OMRON POWER SUPPLY UNIT C200HW PA204
OMRON POWER SUPPLY UNIT C200HW PA204
$5.00
Time Remaining: 16h 17m
Buy It Now for only: $25.00

COUTANT LAMBDA DC POWER SUPPLY OMEGA MML400 E25551
COUTANT LAMBDA DC POWER SUPPLY OMEGA MML400 E25551
$75.50
Time Remaining: 1d 19h 47m
Buy It Now for only: $75.50

Switch Low cost Power Switch Supply Output DC 24V 31A
Switch Low cost Power Switch Supply Output DC 24V 31A
$26.68
Time Remaining: 16h 37m

4Axis Nema 34 Stepper Motor 1600oz  Driver  4 pcs Power Supply CNC Router Mill
4Axis Nema 34 Stepper Motor 1600oz Driver 4 pcs Power Supply CNC Router Mill
$605.00
Time Remaining: 3d 12h 33m
Buy It Now for only: $605.00

A B Bulletin 1771 P2 Power Supply Series B 120 220V 50 60hz 1 5A Allen Bradley
A B Bulletin 1771 P2 Power Supply Series B 120 220V 50 60hz 1 5A Allen Bradley
$9.99
Time Remaining: 16h 47m

NEW AC100 240V to 5V DC 20A 100W Regulated Switching Power Supply
NEW AC100 240V to 5V DC 20A 100W Regulated Switching Power Supply
$21.00
Time Remaining: 11d 9h 19m
Buy It Now for only: $21.00

Power One HN24 36 A 24VDC AT 36AMPS Power Supply
Power One HN24 36 A 24VDC AT 36AMPS Power Supply
$29.99
Time Remaining: 17h 6m

VICOR FLATPAC POWER SUPPLY 48V VI NU4 EM
VICOR FLATPAC POWER SUPPLY 48V VI NU4 EM
$169.49
Time Remaining: 10d 6h 3m
Buy It Now for only: $169.49

SCHNEIDER MODICON TSX PREMIUM 8 SLOT RACK TSXRKY8EX WITH POWER SUPPLY
SCHNEIDER MODICON TSX PREMIUM 8 SLOT RACK TSXRKY8EX WITH POWER SUPPLY
$299.99 (1 Bid)
Time Remaining: 17h 29m

C200HW PA204 Omron PLC Power Supply C200HWPA204
C200HW PA204 Omron PLC Power Supply C200HWPA204
$52.99
Time Remaining: 14d 20h 32m
Buy It Now for only: $52.99

WARNER ELECTRIC MCS 154 2 CLUTCH BRAKE POWER SUPPLY
WARNER ELECTRIC MCS 154 2 CLUTCH BRAKE POWER SUPPLY
$49.99
Time Remaining: 17h 38m

VERO BUCC ELECTRINCS MONOVOLT PK 60 SWITCHING POWER SUPPLY 136 44585 110 240 90W
VERO BUCC ELECTRINCS MONOVOLT PK 60 SWITCHING POWER SUPPLY 136 44585 110 240 90W
$28.00
Time Remaining: 3d 2h 43m
Buy It Now for only: $28.00

WARNER ELECTRIC MCS 154 2 CLUTCH BRAKE POWER SUPPLY
WARNER ELECTRIC MCS 154 2 CLUTCH BRAKE POWER SUPPLY
$49.99
Time Remaining: 17h 38m

FANUC POWER SUPPLY PCB A16B 1212 0871 10C
FANUC POWER SUPPLY PCB A16B 1212 0871 10C
$249.95
Time Remaining: 1d 16h 37m
Buy It Now for only: $249.95

SCHNEIDER MODICON TSX PREMIUM 12 SLOT RACK TSXRKY12 WITH POWER SUPPLY
SCHNEIDER MODICON TSX PREMIUM 12 SLOT RACK TSXRKY12 WITH POWER SUPPLY
$299.99 (1 Bid)
Time Remaining: 17h 51m

NEW AC100 240V to 24V DC 65A 150W Regulated Switching Power Supply
NEW AC100 240V to 24V DC 65A 150W Regulated Switching Power Supply
$27.50
Time Remaining: 11d 9h 19m
Buy It Now for only: $27.50

EMR Power Supply 4990056 Very good condition
EMR Power Supply 4990056 Very good condition
$49.00
Time Remaining: 18h 15m

SOLA Power Supply SDN 25 24 100P 24 28v 25a DIN NEW
SOLA Power Supply SDN 25 24 100P 24 28v 25a DIN NEW
$120.00
Time Remaining: 28d 23h 33m
Buy It Now for only: $120.00

SIEMENS SITOP SMART 10AMP POWER SUPPLY 6EP13342AA01 NEW
SIEMENS SITOP SMART 10AMP POWER SUPPLY 6EP13342AA01 NEW
$100.00
Time Remaining: 18h 20m

KG316T AC 220V Power Supply Automatic Controller Switch
KG316T AC 220V Power Supply Automatic Controller Switch
$21.71
Time Remaining: 18h 28m

24V 3A DC Universal Regulated Switching Power Supply
24V 3A DC Universal Regulated Switching Power Supply
$19.99
Time Remaining: 2d 11h 15m
Buy It Now for only: $19.99

Allen Bradley 1794 PS13 Flex I O Power Supply
Allen Bradley 1794 PS13 Flex I O Power Supply
$1.00
Time Remaining: 18h 32m

NEW AC100 240V to 12V DC 10A 120W Regulated Switching Power Supply
NEW AC100 240V to 12V DC 10A 120W Regulated Switching Power Supply
$21.00
Time Remaining: 11d 9h 24m
Buy It Now for only: $21.00

Daykin AC DC Power Supply and Transformer 15KVA
Daykin AC DC Power Supply and Transformer 15KVA
$200.00
Time Remaining: 18h 41m
Buy It Now for only: $250.00

Nice 1746 P4 A With Good Door Allen Bradley SLC 500 Power Supply
Nice 1746 P4 A With Good Door Allen Bradley SLC 500 Power Supply
$154.00
Time Remaining: 24d 15h 55m
Buy It Now for only: $154.00

Nemic LAMBDA POWER SUPPLY LSS 37 5
Nemic LAMBDA POWER SUPPLY LSS 37 5
$19.99
Time Remaining: 18h 52m
Buy It Now for only: $69.99

NEW AC100 240V to 12V DC 85A 100W Regulated Switching Power Supply
NEW AC100 240V to 12V DC 85A 100W Regulated Switching Power Supply
$21.00
Time Remaining: 11d 9h 24m
Buy It Now for only: $21.00

SOLA 83 24 260 03 POWER SUPPLY  NEW
SOLA 83 24 260 03 POWER SUPPLY NEW
$25.00
Time Remaining: 18h 52m

NEW AC100 240V to 12V DC 20A 250W Regulated Switching Power Supply
NEW AC100 240V to 12V DC 20A 250W Regulated Switching Power Supply
$38.00
Time Remaining: 11d 9h 24m
Buy It Now for only: $38.00

Omron S82K 00324 24V Power Supply NEW
Omron S82K 00324 24V Power Supply NEW
$65.00
Time Remaining: 19h 41m
Buy It Now for only: $72.00

Allen Bradley SLC 500 1746 P2 SER C Power Supply Good Condition
Allen Bradley SLC 500 1746 P2 SER C Power Supply Good Condition
$99.95
Time Remaining: 1d 22h 38m
Buy It Now for only: $99.95

AC 100 264V Transformer LED Light Driver Power Supply
AC 100 264V Transformer LED Light Driver Power Supply
$13.90
Time Remaining: 20h 13m

VLT100 4000 Mini Power Supply EOS 100W FPW VLT1004 for PC104 Motherboard
VLT100 4000 Mini Power Supply EOS 100W FPW VLT1004 for PC104 Motherboard
$89.00
Time Remaining: 16d 23h 26m
Buy It Now for only: $89.00

OMRON S82K 10024 DC 24V 42A PLC POWER SUPPLY
OMRON S82K 10024 DC 24V 42A PLC POWER SUPPLY
$24.95
Time Remaining: 20h 17m

Idec PS5R SG24 240W 10 Amps 24V DC Power Supply DIN Rail Automation Lambda
Idec PS5R SG24 240W 10 Amps 24V DC Power Supply DIN Rail Automation Lambda
$79.99
Time Remaining: 18d 20h 15m
Buy It Now for only: $79.99

GE FANUC IC600PM500K CPU MODULE POWER SUPPLY SERIES SIX 6 IC600 PM500K 230V
GE FANUC IC600PM500K CPU MODULE POWER SUPPLY SERIES SIX 6 IC600 PM500K 230V
$19.00
Time Remaining: 20h 26m

3 Axis CNC Stepper Motor NEMA23 Kit 175 Oz in 24V Power Supply Handle Mach3 New
3 Axis CNC Stepper Motor NEMA23 Kit 175 Oz in 24V Power Supply Handle Mach3 New
$239.99
Time Remaining: 13d 10h 28m
Buy It Now for only: $239.99

Coherent Power Meter Model 212 Laser Power Supply Spectra Physics
Coherent Power Meter Model 212 Laser Power Supply Spectra Physics
$595.00
Time Remaining: 20h 46m

Allen Bradley 120V AC Power Supply MDL 1771 P4S B WARRANTY
Allen Bradley 120V AC Power Supply MDL 1771 P4S B WARRANTY
$7.50
Time Remaining: 13d 17h 53m
Buy It Now for only: $7.50

AB Kinetix 6000 Power supply w 2 Servo Drives 2094 AC05 MP5 S 2094 AMP5 S
AB Kinetix 6000 Power supply w 2 Servo Drives 2094 AC05 MP5 S 2094 AMP5 S
$1,399.99
Time Remaining: 20h 55m

NEW AC100 240V to 24V DC 20A 500W Regulated Switching Power Supply
NEW AC100 240V to 24V DC 20A 500W Regulated Switching Power Supply
$72.99
Time Remaining: 11d 9h 19m
Buy It Now for only: $72.99

SCHNEIDER MODICON TSX PREMIUM 8 SLOT RACK TSXRKY8EX WITH POWER SUPPLY
SCHNEIDER MODICON TSX PREMIUM 8 SLOT RACK TSXRKY8EX WITH POWER SUPPLY
$279.99 (1 Bid)
Time Remaining: 21h 4m

Timer Control Board Power Supply coin acceptor selector
Timer Control Board Power Supply coin acceptor selector
$12.00
Time Remaining: 21d 7h 58m
Buy It Now for only: $12.00

SCHNEIDER MODICON TSX PREMIUM 8 SLOT RACK TSXRKY8EX WITH POWER SUPPLY
SCHNEIDER MODICON TSX PREMIUM 8 SLOT RACK TSXRKY8EX WITH POWER SUPPLY
$299.99 (1 Bid)
Time Remaining: 21h 19m

Power Supply
Power Supply

Tips to consider before buying a new computer power supply

A silent metal box with plastic parts. That is exactly what your computer would be without a power supply. The power supply is the driving force and probably the most important component of your computer. The power running through your home is alternating current (AC), while your computer needs direct current (DC) in order to run. The main role of a power supply is to convert the AC power into DC power. Although the power supply is the most important part of your computer, it is also the most common hardware component to fail. You should consider replacing or upgrading your power supply if your computer occasionally shows a blue screen, locks up, overheats, and if you constantly experience hard disk failures. Also, if you plan on upgrading the components on your system, like installing a new video card, then you might want to consider buying a new power supply too.

 

There are several factors that need to be taken into consideration before purchasing a power supply for your computer. These include:

 

Power Requirement

The power supply first needs to be powerful enough to handle all the various components that make up your computer. Modern power supplies have power outputs ranging from 200 – 500 watts. Before you purchase a power supply, calculate roughly how much power you will need. This can be done by looking at the labels of various components of the computer. Generally, you should never buy a power supply with ratings that are lower than your estimates. Conversely, you should not buy something with too high a power rating, as this would just lead to power wastage.

 

Form Factor

Before you look for a power supply, you should be aware of your computer's form factor. Most power supplies use the Advanced Technology Extended (ATX) form factor. However, not all power supplies use this standard. Older computers used AT form factor. In addition, there are less common form factors such as TFX and BTX. First find out which form factor would fit on your computer before purchasing a power supply.

 

Your computer power supply essentially acts like the heart of your computer, similar to how the motherboard acts like a brain. These fundamental components give your computer life and keep it running.

About the Author

It is wise to invest in a good power supply for your computer; visit "Power Supplies Online" for the very best computer power supplies.

How does the power supply - supply power to the other components?

Hello, I was wondering how the power supply inside the computer supplies power to the other components?
Just a brief explanation.

It's connected with wires that plug into components.

How to Choose the Right Power Supply

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