Variable Power
2009
 |
 Breadboard Power Supply Kit Variable AC DC PIC AVR ARM $9.99 Time Remaining: 4h 12m Buy It Now for only: $9.99 |
 Payne 15A Variable Voltage Control 18TBP 1 15 Single Phase Power Transformer $59.00 Time Remaining: 2d 6h 8m Buy It Now for only: $69.00 |
 POWER TOOL VARIABLE SPEED MOTOR CONTROL 120V 15 AMP NEW $18.99 Time Remaining: 21d 2h 55m Buy It Now for only: $18.99 |
 Payne Eng Variable Transformer Power Supply 36TBP 2 5 $39.99 Time Remaining: 28d 21h 49m Buy It Now for only: $39.99 |
 Northeast Robotics 501200 Variable Power Supply NEW $14.99 Time Remaining: 1d 1h 39m Buy It Now for only: $14.99 |
 Payne Eng Variable Transformer Power Supply 36TBP 1 5 6531 $76.00 Time Remaining: 23d 2h 38m Buy It Now for only: $76.00 |
 Powers Electronics Variable Speed Drive M146 37019 $299.00 Time Remaining: 21d 20h 55m Buy It Now for only: $299.00 |
 NCC type Z1T 00060 065 Variable 06 60 Second Power Up Controller Timer $18.95 Time Remaining: 26d 19h 27m Buy It Now for only: $18.95 |
 AC 220V 6W Power Wired Gear Motor Speed Variable Controller Black $17.12 Time Remaining: 28d 17h 3m Buy It Now for only: $17.12 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.39 Time Remaining: 23d 20h 52m Buy It Now for only: $19.39 |
 LAMBDA EMI VARIABLE DC POWER SUPPLY ESS 300 33 2 D 0806 $3,999.99 Time Remaining: 16d 16h 43m Buy It Now for only: $3,999.99 |
 25 Watt Power AC 220V Variable Speed Controller Motor Gray $85.40 Time Remaining: 21d 19h 45m Buy It Now for only: $85.40 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $64.18 Time Remaining: 11d 18h 38m Buy It Now for only: $64.18 |
 Powertron Power DC Supply PX80 125 80V 125A VARIABLE $499.96 Time Remaining: 2d 2h 58m Buy It Now for only: $499.96 |
 Northeast Robotics Variable Output Power Supplies $30.00 Time Remaining: 14d 20h 7m Buy It Now for only: $30.00 |
 Allen Bradley Power Flex 70 Variable Frequency Drive 1HP 480 Volt 3 Phase $350.00 Time Remaining: 3d 2h 9m Buy It Now for only: $350.00 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $85.41 Time Remaining: 23d 11h 33m Buy It Now for only: $85.41 |
 SUPERIOR ELECTRIC POWER STAT VARIABLE TRANSFORMER $45.00 Time Remaining: 9d 1h 45m Buy It Now for only: $45.00 |
 AC 220V 6W Power Wired Gear Motor Speed Variable Controller Black $17.52 Time Remaining: 22d 1h 38m Buy It Now for only: $17.52 |
 QVR 10A E SUPPLY LOAD VARIABLE POWER REGULATOR LNNLO $30.00 Time Remaining: 23d 15h 14m Buy It Now for only: $30.00 |
 Powerstat 3PN116B Variable Autotransformer hydrogen cell power vibratory 10amps $69.99 Time Remaining: 3d 23h 2m Buy It Now for only: $69.99 |
 AC 220V 6W Power Wired Gear Motor Speed Variable Controller Black $17.23 Time Remaining: 21d 18h 46m Buy It Now for only: $17.23 |
 AC 220V 6W Power Wired Gear Motor Speed Variable Controller Black $16.62 Time Remaining: 22d 4h 29m Buy It Now for only: $16.62 |
 Cosel PMC100E 1 Variable AC DC Switching Power Supply 5 12V PMC100 $49.99 Time Remaining: 9d 6h 14m Buy It Now for only: $49.99 |
 ALLEN BRADLEY POWER FLEX 4 VARIABLE FREQUENCY DRIVE VFD $200.00 Time Remaining: 3d 7h 47m |
 Power Electronics Variable Speed Drive MSM4A 37090 $299.00 Time Remaining: 12d 19h 55m Buy It Now for only: $299.00 |
 POWER ELECTRONICS 10HP 3 PHASE PWM VARIABLE SPEED AC DRIVE M104CXH 1L073 $499.99 Time Remaining: 7d 20h 52m Buy It Now for only: $499.99 |
 Lambda Power Supply JWS150 24 A Switch Mode Variable Output 6510 $185.00 Time Remaining: 21d 23h Buy It Now for only: $185.00 |
 120 Watt Power AC 220V Gear Motor Speed Variable Controller $17.99 Time Remaining: 22d 17h 31m Buy It Now for only: $17.99 |
 MSM2A POWER ELECTRONICS 24A 208 480V VARIABLE SPEED $475.00 Time Remaining: 5d 7m Buy It Now for only: $475.00 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.71 Time Remaining: 21d 20h 59m Buy It Now for only: $19.71 |
 Northeast Robotics 50 1200 Variable Output Power Supply $295.00 Time Remaining: 21d 19h 2m Buy It Now for only: $295.00 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.48 Time Remaining: 13d 19h 57m Buy It Now for only: $19.48 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $70.51 Time Remaining: 23d 5h 8m Buy It Now for only: $70.51 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.44 Time Remaining: 14d 9h 30m Buy It Now for only: $19.44 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $83.18 Time Remaining: 20d 5h 36m Buy It Now for only: $83.18 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.39 Time Remaining: 4d 17h 59m Buy It Now for only: $19.39 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.68 Time Remaining: 18d 8h 51m Buy It Now for only: $19.68 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.42 Time Remaining: 16d 1h 30m Buy It Now for only: $19.42 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $82.49 Time Remaining: 9d 8h 5m Buy It Now for only: $82.49 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $18.84 Time Remaining: 6d 9h 34m Buy It Now for only: $18.84 |
 120 Watt Power AC 220V Gear Motor Speed Variable Controller $17.70 Time Remaining: 16d 4h 51m Buy It Now for only: $17.70 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $19.44 Time Remaining: 7d 10h 45m Buy It Now for only: $19.44 |
 GRAHAM POWER SUPPLY VARIABLE SPEED DRIVE 440 500V NR $199.99 Time Remaining: 19h 17m Buy It Now for only: $199.99 |
 120 Watt Power AC 220V Gear Motor Speed Variable Controller $17.16 Time Remaining: 17d 22h 5m Buy It Now for only: $17.16 |
 120 Watt Power AC 220V Gear Motor Speed Variable Controller $17.18 Time Remaining: 17d 23h 51m Buy It Now for only: $17.18 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $82.52 Time Remaining: 9d 2h 54m Buy It Now for only: $82.52 |
 25 Watt Power AC 220V Gear Motor Speed Control Variable Controller $20.48 Time Remaining: 14d 9h 2m Buy It Now for only: $20.48 |
 Cosel MMC100U 4 a power supply 12VDC+ 12VDC and variable 5VDC+ $44.00 Time Remaining: 4d 4h 9m Buy It Now for only: $73.00 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $85.42 Time Remaining: 16d 23h 29m Buy It Now for only: $85.42 |
 Lambda Power Supply JWS50 24 A Switch Mode Variable Output 6681 $74.00 Time Remaining: 13d 22h 59m Buy It Now for only: $74.00 |
 EATON DYNAMATIC 15 568 1 POWER SUPPLY PCB BOARD AC VARIABLE DRIVE 70 208 1 REV B $161.35 Time Remaining: 19h 41m Buy It Now for only: $161.35 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $82.66 Time Remaining: 9d 4h 50m Buy It Now for only: $82.66 |
 25 Watt Power AC 220V Variable Speed Controller Motor Gray $85.41 Time Remaining: 10d 8h 2m Buy It Now for only: $85.41 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $68.40 Time Remaining: 5d 8h 38m Buy It Now for only: $68.40 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $69.02 Time Remaining: 20d 14h 3m Buy It Now for only: $69.02 |
 AC 220V 6W Power Wired Gear Motor Speed Variable Controller Black $16.64 Time Remaining: 21d 10h 38m Buy It Now for only: $16.64 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $82.66 Time Remaining: 13d 5h 11m Buy It Now for only: $82.66 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $68.46 Time Remaining: 7d 4h 33m Buy It Now for only: $68.46 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $68.57 Time Remaining: 14d 17h 36m Buy It Now for only: $68.57 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $68.56 Time Remaining: 12d 23h 3m Buy It Now for only: $68.56 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $69.03 Time Remaining: 15d 22h 29m Buy It Now for only: $69.03 |
 PAYNE POWER CONTROL 18E 4 20 3 PHASE VARIABLE VOLTAGE $489.97 Time Remaining: 13d 3h 59m Buy It Now for only: $489.97 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $70.50 Time Remaining: 17d 8h 37m Buy It Now for only: $70.50 |
 25 Watt Power AC 220V Variable Speed Controller Motor Gray $83.24 Time Remaining: 16d 19h Buy It Now for only: $83.24 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $80.26 Time Remaining: 5d 23h 13m Buy It Now for only: $80.26 |
 Cambion 8023970 Variable Temp Control Power Supply $139.50 Time Remaining: 12d 23h 57m Buy It Now for only: $139.50 |
 Cosel ADA1000F 24 Variable Output 1000W Switching Power Supply Module ADA1000F24 $199.99 Time Remaining: 7d 10h 22m Buy It Now for only: $199.99 |
 AC 220V 25W Power Single Phase Stepless Variable Speed Control Motor $73.76 Time Remaining: 13d 20h 7m Buy It Now for only: $73.76 |
 15W Power AC Stepless Variable Speed Controller Motor 220V $66.50 Time Remaining: 6d 1h 47m Buy It Now for only: $66.50 |
 Northeast Robotics 501200 Variable Output Power Supply $49.00 Time Remaining: 25d 7h 40m Buy It Now for only: $49.00 |
Variable Power
How does Magnification/Power and Field of View effect Binoculars?
Binoculars are commonly described by using a pair of numbers, as in "7x50" or "8x25."
The first of these numbers refers to the magnification or power offered by the binocular. Magnification is why most people buy a pair of binoculars. In the examples above, "7x" means the binocular makes whatever you look at appear seven times closer than it does to the unaided human eye. "8x" means the binocular makes whatever you look at eight times closer than the unaided human eye. "10x" makes things look ten times closer, and so on. The first number used to describe binoculars always refers to their magnification. Common binocular magnifications are 6x, 7x, 8x, 9x, and 10x.
There are also variable power zoom binoculars, such as 7-21x50. These almost always perform much better at the low power setting than they do at the higher settings. This is because the front objective lens cannot enlarge to let in more light as the power is increased, so the view gets dimmer. At 7x, the 50mm front objective lens provides a 7.1mm exit pupil, but at 21x, the same front objective lens provides only a 2.38mm exit pupil. Also, the optical quality of a zoom binocular at any given power is inferior to that of a fixed power binocular of that power. In general, zoom binoculars are not the bargain they seem to be.
The second number most commonly associated with binoculars refers to the diameter of the front objective lens in millimeters. Thus in "7x50," the "50" means that the front lenses of the binoculars are 50mm in diameter, and that would be good for dimmer light conditions. They are sometimes referred to as night vision binoculars. This size is large for hand held binoculars and may be awkward to handle without a tripod or something to rest them on.
Power affects brightness, so the higher the power, the dimmer the view. And power also affects the field of view of binoculars, therefore, the higher the power, the smaller the field of view. So, as you can see, power must be balanced against other desirable characteristics when choosing your binoculars.
Try out several types of binoculars for each of your particular uses. If your viewing is mostly in the bright day light, then you do not need binoculars with an objective lens of 50, 60 or higher. Those larger objective lenses do well at dusk or darker applications. Perhaps you will need both types of binoculars for all your viewing needs. It really depends on your particular usage. In either case enjoy your out-door activates with enhanced views and closer views through your favorite binoculars.
Field of View
The field of view is the area seen through your binoculars. It is properly measured in degrees. The larger the field of view the more area you can see. Field of view is particularly important when observing moving subjects, like animals or birds, at sporting events, and observing a beautiful scenic view. If you wear glasses, look for binoculars with a higher rating for field of view. You'll be much happier.
Roger Johnson
About the Author
Roger Johnson has loved watching birds, animals and great scenery with binoculars and telescopes for years. For more tips and helpful information, please contact me at http://www.binoculardeals.com and http://www.binoculardeals.blogspot.com and then you can focus in on the world around you.
What is the comparison of a camera lens to a set of variable power binoculars (300mm lens = what power)?
On a 35mm camera, 300mm is about 6x magnification. On a 'normal' DSLR (crop frame, not full frame) its about 9x magnification. It varies depending on the exact sensor though.
The zoom number quoted for lenses is normally just the range from wide to telephoto. A 28-300 and an 18-200 are both ~11x zooms, though the magnification is different for both.
Variable Speed Oscillating Multifunction Power Tool # 67537 - Harbor Freight Tools
