A DC power supply is used in place of a 12 volt battery when you need to operate car audio equipment and the only source of power is the mains voltage (AC wall outlet). This type of power supply is similar to a battery charger but has much better 'manners'. A battery charger is generally unregulated. Some high current battery chargers will produce up to 17 volts as the battery reaches it fully charged state. The regulated DC power supplies will not go above their regulated voltage. The regulated DC power supply should not be connected to a dead battery. Since it is designed to maintain a constant output voltage, it will instantly try to bring the battery's voltage up to its regulated voltage and may blow its internal fuses or be damaged (depending on its design). A good DC power supply will not cause a hum like a battery charger will (which is important when you want to listen to your system for extended periods of time or when tweaking your system). Linear DC power supplies: A linear power supply uses its output transistors in much the same way as class A or class A/B amplifiers use their output transistors.

This means that, when the supply is in use, there's current flowing through the transistors and a voltage drop across the transistors. This type of supply has little or no high frequency noise present at its output terminals but the transistors (operating in a linear mode) produce a lot of heat when driving heavy loads. They also tend to have very large, heavy transformers. Switching DC power supplies: A switching power supply uses its output transistors much like the switch-mode power supply in your amplifier or like the output transistors of a class D amplifier. This means that the output transistors are either fully on or fully off. There is, in theory, no current flowing through the transistors when there is a voltage drop across the transistors and there is no voltage drop across the transistors when current is flowing through them. These power supplies are very efficient and produce relatively little heat when compared to their linear mode counterparts. They are slightly noisier than linear power supplies (especially high frequency noise).

These supplies are smaller and more lightweight than linear power supplies. For those who want to use a car audio amplifier in their home... Using all car audio equipment: This diagram shows how the power and ground connections would be made to the power supply. You notice that there are fuses on all of the wires that are connected to the power supply's positive terminal. These are ABSOLUTELY necessary. It is just as easy to start an electrical fire indoors as it is in a car. 5 amp fuses should be sufficient in the radio's power wires. The amplifier's fuse would be determined by the amplifier's current draw requirements. You should read the page of this site for more info. The radio and the amplifier would operate precisely as they do in the vehicle in this configuration. Either of the next two will work with your MP3 player. Instead of connecting the home receiver to the amplifier, you would connect the output of your MP3 player to the amp using a cable to adapt the MP3 player's headphone jack to the amplifier.

Driving a car audio amplifier from a home receiver (example #1): If you want to use a home receiver with your mobile amplifier and you're lucky enough to have a receiver with a set of preamp output and main amplifier input jacks, you would connect your system as shown in the following diagram. air handling unit useThe level of the audio from the preamp output jacks are controlled by the volume control. cost of new ac unit installedYou may have to connect the power supply's ground to the ground screw on the back of your receiver to prevent/reduce AC hum. fix an ac unitIf you only want to use your external amplifier for bass and want to continue using the receiver's internal amplifier to driver other speakers, you will have to use Y-cables to split the signal.

In the image below, the bars connecting the preamp output and main input jacks are simply what's used to connect the preamp output signal to the receiver's internal amplifier. Driving a car audio amplifier from a home receiver (example #2): If your receiver does NOT have pre out/main in jacks, you will have to use the tape monitor output jacks and an external amplifier. This type of setup will NOT work well if you are driving speakers from the receiver's speaker level outputs. You will also have to use an external volume control to control the audio output levels. The audio output from the tape monitor outputs is NOT controlled from the receiver's volume control. You can find the full description of the volume control on the page of this site. Some people want to use a line output converter to drive car amplifiers with a home receiver. Sometimes the LOC will have a relatively low impedance (4 ohms) loading resistor. This may overload the outputs in some receivers. If you want to use an LOC, insert a 1 or 2 amp fuse in series with the receiver's positive speaker output terminals which are to drive the LOC. Don't try it without the fuses.

This calculator was originally designed to calculate voltage drop in power wire. If there's anything you don't understand about the data generated, refer to the wire page. To calculate for wire sizes 00, 000 and 0000... • 00 = -1 • 000 = -2 • 0000 = -3 Total RMS Amplifier Power? Minimum Power Supply Current Rating (for rated power output): Power Drawn From Power Supply:Edit ArticleHow to Connect a Car Stereo for House Use With a Psu Two Methods:On the PSUOn StereoCommunity Q&A Did you know that you don't need to buy a stereo specifically for home use? You can use your car stereo. Follow these steps to safely connect your car stereo to your home power supply. Disconnect all power from PSU. Depending on year and model of PSU, there may have different color wires. 3Try to eliminate blue orange, red and green, Now all the yellow wires using the wire strippers, strip them approximately 1 inch (2.5 cm). 5Twist all yellow cords together,