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Specifications:
- The power supply with remote control is easy to install and carry
- Can be normally used in wide voltage range of 100V-260V in countries of all over the world
- Light weight, easy transportation
- Interference is small
- Input Voltage: AC 100-260V 50-60Hz
- Output Voltage: DC 12V 3A
- Outer Dimensions: 103 x 68 x 33mm / 4.06 x 2.68 x 1.30in
Details:
- With remote control, this DC 12v power supply is a good partner for the entrance guard controller
- This regulated 12v power supply can be normally used in wide voltage range of 100V-260V in countries of all over the world
- Supplies of this portable power supply are designed and manufactured to meet the demands of access control installations today
- With the appropriate size and lightweight design, this DC 12v power supply is convenient and easy to install
- And this DC 12v power supply is made of high quality material which is durable for a long time use
Size in Detail:
Types of DC Power Supply?- Batteries are a common source of DC power.
batteries + image by Warren Millar from Fotolia.com Electric current comes in two types: AC and DC. AC, or alternating current, switches rapidly from positive to negative and back again. It is used in power lines to transport electricity across large distances. DC, or direct current, power continuously flows in the same direction. DC power supplies provide power either straight from DC sources or else from AC sources that have been converted to DC.
Battery Power Supply- A battery power supply is the simplest way of providing DC power. Batteries have chemical energy stored inside. When they are connected in a circuit, that chemical energy is converted into electrical energy, which powers the circuit. Batteries are all rated at a certain voltage, a measure of the amount of pressure the electricity creates in the circuit. They are also limited in the amount of amperage -- basically, the speed at which electricity can flow out of the battery -- that they can provide.
- Multiple batteries are wired in series to increase the voltage or in parallel to increase the amperage and the total lifespan of the battery pack. Series batteries are wired so that the negative terminal of one battery is wired to the positive terminal of the next in a line, whereas in a parallel circuit, all the positive battery terminals are wired together and all the negative terminals are wired together. For example, if 4 1.5 volt AA batteries are wired in series, they will produce 6 volts (1.5 x 4). If they are wired in parallel, they will be able to produce 4 times the amperage, or last for 4 times as long producing their normal amperage.
Rectifiers
- Many electronic devices need DC power, but the electricity in power lines is AC. A rectifier circuit converts AC power directly to DC. A rectifier begins with a transformer. The electricity flows through a coil that is right beside a second coil of wire and an iron element called the core. The second coil of wire sometimes has fewer turns than the first coil, creating a step-down circuit: the voltage that comes out of the transformer is lower than the voltage that comes in. If the secondary coil has more turns, it steps up or increases the voltage.
- The output then goes through an electronic one-way valve called a diode. In a half-wave rectifier, electricity is only allowed to flow through the diode during the positive half of the AC wave. During the negative half, the diode closes. In a full wave rectifier, electricity is allowed to flow down a positive output during the positive half of the AC wave and down a negative output during the negative half of the wave. This creates two streams of electricity, one positive and the other negative. Initially, the electricity is very "bumpy" because it comes straight from an AC circuit. Other circuitry in the rectifier smooths it out to get continuous DC power.
Combined Power
- Many DC power supplies combine both batteries and rectifier circuits. For example, a computer power supply has a sophisticated rectifier in the power brick that takes AC current from the wall and converts it to very smooth DC voltage for the computer. This DC voltage charges up the laptop battery and powers the laptop. When the laptop is unplugged, it automatically switches to battery power until it is plugged in again.
- Similarly, the alternator in a car is a generator that produces AC power. This power is converted to DC and used to power the car's ignition, spark plugs, radio, air conditioning and other electronic systems, and to charge the car battery. The car battery, in turn, powers the starter motor and other systems when the engine is off, using the stored power produced by the alternator.
Package Included:
- 1 x Power Supply
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DnM Imports
from ()
Bought this item on
05-05-2011- Other Thoughts: Good cooling, steady power. Had it for a while now.
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Stephen Guest
from ()
Bought this item on
03-30-2011- Other Thoughts: I purchased this item to power my Lipo charger and after I burned out a 20 Amp power source. Meets all of my expectations.
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John Silber
from ()
Bought this item on
02-24-2011- Other Thoughts: This portable Power Supply works ok but emits too much RF broadband noise (hash).
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Nathan
from (La Mirada Ca.)
Bought this item on
12-03-2010- Pros: Works like a charm Gives the right voltage Quality built Easy to install
- Cons: Wires are a little short
- Other Thoughts: For the price, this is about as good as you are going to get. Good quality, great construction.
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Malanie Shashika
from ()
Bought this item on
03-16-2011- Other Thoughts: Just got mine about 2 days ago, it has been on 24 hours a day on the Yaesu FT-857D.
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