Power Supply
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 AC TO DC Output 12V 6A 72W Power Supply Adapter For 3528 5050 RGB LED Strip $13.99 Time Remaining: 21d 9h 21m Buy It Now for only: $13.99 |
 20 volt 42500 mfd power cap $0.50 Time Remaining: 13h 46m |
 Waterproof 5M RGB 3528 Flexible 300 LED Strip + 24 KEY IR + 12V Power Supply D6 $24.99 (1 Bid) Time Remaining: 6h 45m |
 3528 RGB SMD 5M 300 LED Strip Light Waterproof + IR Remote + 2A Power Supply $30.50 Time Remaining: 17d 3h 15m Buy It Now for only: $30.50 |
 5M 5050 SMD 300 Flash RGB LED Flexible Strip Light + Controller + Power supply $46.99 Time Remaining: 8h 1m Buy It Now for only: $51.99 |
 3 Sockets Car Cigarette Lighter Socket Splitter Charger w USB Port Power Supply $4.13 Time Remaining: 14d 15h Buy It Now for only: $4.13 |
 5M SMD 5050 RGB LED strip light 150 LED IR Remote Controller Power Supply 3A $29.99 Time Remaining: 13h 40m |
 CAR AUTO VEHICLE ADAPTER CHARGER CABLE FOR GARMIN NUVI GPS POWER SUPPLY CORD NEW $5.50 Time Remaining: 20d 4h 49m Buy It Now for only: $5.50 |
 5M SMD 5050 RGB LED strip light 150 LED IR Remote Controller Power Supply 3A $29.99 Time Remaining: 13h 43m |
 RGB 5050 5M Waterproof SMD 300 LED Strip+44KEY IR Controller +12V 6A PowerSupply $46.49 Time Remaining: 12d 6h 47m Buy It Now for only: $46.49 |
 5M SMD 5050 RGB LED strip light 150 LED IR Remote Controller Power Supply 3A $29.99 Time Remaining: 13h 49m |
 Car Charger Adapter For Magellan Roadmate 1340 1220 1212 1210 1200 Power Supply $4.99 Time Remaining: 13d 17h 39m Buy It Now for only: $4.99 |
 Winston Power Supply Adapter Model NO JT DC6V500 Brand New in Box Low Price $9.99 (1 Bid) Time Remaining: 15h 24m |
 Bestek 300W car power inverter DC 12V to 110v ac adapter USB charger supply MP3 $14.99 Time Remaining: 22d 20h 21m Buy It Now for only: $14.99 |
 12V to 5V 3A 15W DC DC Converter Step Down Buck Module Car LED Power Supply $0.01 Time Remaining: 16h |
 AC Adapter + Car Charger Power Supply LeapFrog LeapPad Explorer Learning Tablet $11.45 Time Remaining: 23d 14h 45m Buy It Now for only: $11.45 |
 5M SMD 5050 RGB LED strip light 150 LED IR Remote Controller Power Supply 3A $29.99 Time Remaining: 17h 49m |
 Waterproof 5M RGB SMD 5050 Flexible 300 LED Strip + 44 KEY IR + 12V Power Supply $149.95 Time Remaining: 21d 14h 49m Buy It Now for only: $149.95 |
 REGULATED DC POWER SUPPLY 138V 3 Amp with Cigarette Lighter Plug $9.98 Time Remaining: 4d 7h 25m |
 Car Adapter For Philips PD7012 37 Dual Screens Auto Power Supply Cord DC Charger $12.99 Time Remaining: 15d 19h 36m Buy It Now for only: $12.99 |
 12V 2A AC DC 24W US Adapter Power Supply AC 100 240V For LED Strip Lighting New $1.36 (4 Bids) Time Remaining: 1d 16h 51m |
 Car Vehicle Auto Lighter Charger Adapter For Medela Breastpump Power Supply Cord $5.39 Time Remaining: 7d 16h 8m Buy It Now for only: $5.39 |
 McIntosh MEP450 Equalizer power supply BRAND NEW VERY RARE $99.00 Time Remaining: 1d 22h 50m |
 10M RGB 5050 SMD Flash LED Strip + 44key IR Remote+ Power Supply+Tracking number $56.99 Time Remaining: 26d 20m Buy It Now for only: $56.99 |
 Sailor 500 Fleet Broadband BDU Power Supply Satellite Phone $8,999.00 Time Remaining: 2d 2h 22m Buy It Now for only: $9,899.90 |
 NEW 110V AC TO DC CONVERTER POWER SUPPLY 12V 15AMP FULLY REGULATED LOW RIPPLE $69.95 Time Remaining: 23d 6h 44m Buy It Now for only: $69.95 |
 NEW 4 Prong WIRE POWER SUPPLY CORD KIT RANGE DRYER OVEN STOVE 125 250 V AC 4 FT $17.99 Time Remaining: 2d 4h 59m Buy It Now for only: $19.99 |
 5M Waterproof RGB 5050 SMD 300LED Strip+44 key IR Controller+12V 72W PowerSupply $46.49 Time Remaining: 21d 9h 21m Buy It Now for only: $46.49 |
 audio authority 2 77 power supply $0.99 Time Remaining: 5d 1h 31m Buy It Now for only: $175.00 |
 5M RGB 5050 SMD 300LED Strip+44key IR Controller+12V72W PowerSupply unWaterproof $42.39 Time Remaining: 21d 9h 20m Buy It Now for only: $42.39 |
 Vector Electromate 250 Watt Power Supply Car Inverter Jumper Alternator Check $9.99 (2 Bids) Time Remaining: 2d 8h 41m |
 New 12V 5M 5050 RGB 300 SMD LED Light Strip + 24Key IR Remote + Power Supply $42.99 Time Remaining: 18d 12h 45m Buy It Now for only: $42.99 |
 2 Ch 20W Mini HI FI Audio Stereo Amplifier Car Motorcycle Boat MP3 +Power Supply $9.99 Time Remaining: 2d 9h 32m |
 AC TO DC Output 12V 2A 24W Power Supply Adapter For 3528 5050 RGB LED Strip $6.99 Time Remaining: 24d 6h 56m Buy It Now for only: $6.99 |
 Whelen ISP 188 Strobe Power Supply used 8 outlet $20.00 Time Remaining: 2d 14h 1m |
 Waterproof 5M RGB 3528 Flexible 300 LED Strip + 44 KEY IR + 12V Power Supply GT $27.99 Time Remaining: 13d 16h 6m Buy It Now for only: $27.99 |
 5M Waterproof 300LED SMD 5050 RGB LED Strip + 24key IR Remote + Power Supply 5A $39.99 Time Remaining: 2d 15h 4m |
 AC100 240V To DC 12V 6A 72W Power Supply Adapter US EU UK AU For Led strip Light $13.99 Time Remaining: 12d 6h 43m Buy It Now for only: $13.99 |
 Stinger Sps 80 power supply 80 amp continuous multiple battery charger $199.00 Time Remaining: 2d 15h 15m Buy It Now for only: $299.00 |
 New Cool White 5M 16FT Waterproof 5050 SMD LED Strip 300 LEDS Whth Power Supply $36.99 Time Remaining: 18d 13h 2m Buy It Now for only: $36.99 |
 5M Waterproof 300LED SMD 5050 RGB LED Strip + 24key IR Remote + Power Supply 5A $39.99 Time Remaining: 2d 18h 4m |
 5M RGB SMD 5050 Flexible 300 LED Strip + 24 KEY IR Remote + Power Supply $34.50 Time Remaining: 3d 7h 27m |
 DC Car Auto Charger Vehicle Adapter For Philips 996510021372 Power Supply Cord $9.99 Time Remaining: 2d 4h 44m Buy It Now for only: $9.99 |
 NEW 4 Prong WIRE POWER SUPPLY CORD KIT RANGE DRYER OVEN STOVE 125 250 V AC 6FT $20.99 Time Remaining: 3d 8h 31m Buy It Now for only: $24.99 |
 New Blue 5M Waterproof 3528 SMD LED Strip 300 LEDS + Power supply $22.99 Time Remaining: 21d 17h 10m Buy It Now for only: $22.99 |
 Audiovox DP96U 96 Watt DC to AC Power Inverter Mobile 110 Volt Power Supply $15.00 Time Remaining: 3d 13h 5m Buy It Now for only: $19.95 |
 Brand new 100 240V DC 12V 2A Converter Adapter Power Supply for led light strip $6.98 Time Remaining: 9d 4h 27m Buy It Now for only: $6.98 |
 Bestek 300W car power inverter DC 12V to 110v ac adapter USB charger supply MP3 $20.45 (12 Bids) Time Remaining: 3d 14h 56m |
 3 Way Car Cigarette Socket Splitter DC USB Power Supply Car Charger Adapter $3.12 Time Remaining: 7d 15h 59m Buy It Now for only: $3.12 |
 4pcs easy connector for led strip light lamp 3528 5050 adapter power supply $0.01 Time Remaining: 3d 15h 5m |
 328ft 1M Wateproof RGB 5050 30P SMD LED Light Strip w IR Remote Power Supply US $9.99 Time Remaining: 27d 15h Buy It Now for only: $9.99 |
 Zapco EQ30 SL Sound Processor Equalizer Set w Zapco PSI HPSL Power Supply $349.99 Time Remaining: 3d 19h 58m |
 12V 5A 60W Power Supply Adapter for 3528 5050 RGB SMD LED Lamp Light Strip $10.63 Time Remaining: 14d 1h 20m Buy It Now for only: $10.63 |
 CAE APS 220 55 Power supply Inverter $100.00 (1 Bid) Time Remaining: 4d 5h 59m |
 Car Adapter For Sylvania SDVD7015 7 Portable DVD Charger Auto Power Supply Cord $7.99 Time Remaining: 11d 16h 21m Buy It Now for only: $7.99 |
 Waterproof 5M RGB 3528 Flexible 300 LED Strip + 44 KEY IR + 12V Power Supply D2 $28.90 Time Remaining: 4d 7h 49m |
 Headrest DVD Monitor Power Supply Cigarette Lighter $8.29 Time Remaining: 21d 12h 35m Buy It Now for only: $8.29 |
 Waterproof 5M RGB 3528 Flexible 300 LED Strip + 44 KEY IR + 12V Power Supply D3 $27.50 Time Remaining: 5d 7h 17m |
 1M RGB 5050 SMD 30 LED Strips With 24Key Controller 12V+Power Supply $15.20 Time Remaining: 4d 21h 4m Buy It Now for only: $15.20 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $0.90 Time Remaining: 5d 15h 38m Buy It Now for only: $6.84 |
 5M RGB 3528 SMD 270LED Strip+44key IR Controller+12V24W PowerSupply unWaterproof $23.79 Time Remaining: 21d 9h 19m Buy It Now for only: $23.79 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $4.90 Time Remaining: 5d 16h 21m Buy It Now for only: $6.84 |
 328ft 1M Wateproof RGB 5050 30P SMD LED Light Strip w IR Remote Power Supply US $9.99 Time Remaining: 28d 21h 53m Buy It Now for only: $9.99 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $4.90 Time Remaining: 5d 16h 32m Buy It Now for only: $6.84 |
 5M Waterproof RGB 5050 SMD 300LED Strip+24 key IR Controller+12V 72W PowerSupply $45.19 Time Remaining: 21d 9h 21m Buy It Now for only: $45.19 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $4.90 Time Remaining: 6d 3h 3m Buy It Now for only: $6.84 |
 FSP FSP228 3F01 Power Supply Replacement for LCD TV $50.99 Time Remaining: 4d 16h 44m Buy It Now for only: $50.99 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $0.90 Time Remaining: 6d 14h 10m Buy It Now for only: $6.84 |
 BESTEK 7 Amp AC to 12V DC power supply Adapter charger TV car cigarette socket $6.39 Time Remaining: 22d 15h 43m Buy It Now for only: $6.39 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $0.90 Time Remaining: 6d 14h 20m Buy It Now for only: $6.84 |
 164ft 5M Wateproof RGB 5050 150P SMD LED Light Strip w IR Remote Power Supply $34.99 Time Remaining: 27d 15h Buy It Now for only: $34.99 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $4.90 Time Remaining: 6d 14h 22m Buy It Now for only: $6.84 |
 Car Auto DC Adapter For Philips AY4197 AY 4197 Dual Screen Charger Power Supply $9.99 Time Remaining: 9d 5h 19m Buy It Now for only: $9.99 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $0.90 Time Remaining: 6d 14h 38m Buy It Now for only: $6.84 |
 5M RGB 3528 SMD Non Waterproof 300 LED Strips + 44 IR Remote 24W Power Supply EU $25.98 Time Remaining: 17d 4h 34m Buy It Now for only: $25.98 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $4.90 Time Remaining: 6d 14h 43m Buy It Now for only: $6.84 |
 Car DC Charger For Escort Passport 8500 X50 Blue Red Radar Detector Power Supply $9.54 Time Remaining: 20d 7h 24m Buy It Now for only: $9.54 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $0.90 Time Remaining: 6d 14h 44m Buy It Now for only: $6.84 |
 New Cool White 5M 16FT Waterproof 3528 SMD LED Strip 600 LEDS + Power supply USA $30.99 Time Remaining: 9d 9h 55m Buy It Now for only: $30.99 |
 ORIGINAL Garmin forerunner 305 405 watch AC DC power supply + CHARGER USB CABLE $4.90 Time Remaining: 6d 14h 53m Buy It Now for only: $6.84 |
All you need to know about desktop power supplies
The power supply unit is the most vital component in the operation of a desktop computer. A desktop power supply unit supplies power to the other components in a computer, and converts alternating current (AC) from an electrical outlet to direct current (DC) which is needed by the computer. Power supplies can be inbuilt or external. External power supplies are crucial to the operation of virtually all small electronic devices. They convert high voltage AC to low voltage DC used to power electronic products, like MP3 players, PDAs, camcorders, digital cameras, mobile phones, IT equipment and laptops.
Power supplies are sold based on their wattage, which is their total power output. External desktop power supplies range from as low as 15W to as high as 220W. You need to find one that will power all the components connected to the system. It is important that the power supply can support the various voltage levels and the current supplied. For more advanced computers, with extra features and gadgets, you will need a more robust power supply unit. The power supply should be able to switch voltages and distribute it to all components required. Power supplies these days can provide various output voltage levels, from 3.3V, 5V, 12V, 18V, 24V and even 48V.
Desktop power supplies are available in various models such as switched-mode, linear, regulated and unregulated models. These can supply output voltage in single, dual or triple output models. A switched-mode power supply is a unit that incorporates a switching regulator in order to provide the required output voltage. Linear power supplies are much less efficient than switched-mode power supplies, and adjust the voltage to maintain a constant output voltage. A regulated power supply is a stable power supply that controls the output voltage to a specific value. An unregulated power supply is not subject to the control or authority of a voltage regulator, and the DC output voltage is dependent upon an internal voltage reduction transformer.
Power supplies can be designed to be lightweight and low profile for consumers as well as for industrial use. Good power supplies use surface mount technology and through-hole components, providing maximum efficiency and high reliability. A highly efficient power supply should have universal AC input, be self contained and hermetically sealed (airtight), have product safety certification (UL, CUL, TUV, CB and CE listings), and have a temperature range of -20oC to +85oC. Power supplies should also come with over voltage, over current, over load, short circuit and open circuit protection and thermal fuse protection. Features such as auto-recovery start up and LED indicators are also included in certain power supplies.
About the Author
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