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How to Rewire a Car Lighter Adapter Plug Portable electronic appliances typically come with 12-volt adapters and patch cords that enable such appliances to be used inside vehicles. In the United States, production of 12-volt automobile plugs is standardized under "UL standard 2089," which covers plugs and patch cords that insert into cigarette lighter receptacles. A 12-volt car lighter adapter plug is easy and convenient to use, but can sometimes become defective due to abuse or misuse. If you know how to rewire a defective car lighter adapter plug you can save yourself some cash. Things You'll Need Diagonal pliers Wire stripper Soldering gun Solder wire Instructions Cut the cord attached to the lighter plug about 2 inches below the plug, using diagonal pliers. Remove about 2 inches of outer covering from the tip of the patch cord, using diagonal pliers. Strip off 1/2 inch of insulation from the tip of the two inner wires (positive and negative), using a ...

How to Check if a Diode Is Bad Diodes are semiconductor devices that conduct current in one direction only, and are commonly made from silicon or germanium. Diodes have two terminals -- an anode and a cathode -- with the cathode being marked by a line painted on the body of the diode. Current is allowed to flow from the anode to the cathode, but is blocked in the other direction. This property is used most commonly in rectifier circuits, which change alternating current to direct current. Diodes are also used to protect components in a circuit if the power is connected the wrong way around, blocking the flow of current to stop damage being caused. Although diodes rarely fail, it can happen if they are exposed to voltage or current above their rated limits. Things You'll Need Digital multimeter Soldering iron Desoldering braid Pliers Instructions Unsolder one leg of the diode if it is part of a circuit, otherwise the other components in the circuit may affect the resul...

How to Identify Diode Markings Diodes are electronic components that permit the flow of electric current in one direction only, shutting current off when it reverses. These handy devices have dozens of important uses in circuits, including as power supplies and radio signal detectors. Because diodes have polarity, their packaging carries distinct markings that help you connect them correctly in a circuit. Signal Diodes The smallest discrete diodes are designed to handle about 100 milliamps of current. These devices are typically packaged in tiny glass cylinders with a connecting lead at each end. A stripe on the cylinder marks the diode’s cathode, making the opposite side the anode. With some diodes, you may need a magnifying glass to see the stripe clearly. Mid-Power Diodes Diodes used as rectifiers in small power supplies are usually rated between 1 and 5 amps of current, maximum. These components usually have a cylindrical body made of dark epoxy or ceramic with a white or...

How to Connect Diodes Diodes are semiconductor materials that behave like switches. They are open to electricity in one direction and short-circuited in the other, meaning that current is allowed to flow in only one direction. Silicon and germanium are two materials they are often made from. The symbol for a diode is an arrow to show the direction current flow is allowed. A diode placed in a circuit this way is known as forward-biased. A diode with current flow in the wrong direction is called reverse-biased. Ordinary reverse-biased diodes will finally allow current when there is too much current flowing the wrong way. When this happens, they are destroyed. Things You'll Need Silicon diode, such as a 1N4001 Resistor Multimeter Breadboard Jumper wires Battery Instructions Measure the forward-biased voltage on the diode by placing the multimeter on the diode setting. Put the positive or red lead on the anode side of the diode, which is unmar...

Why Do I Need a Blocking Diode on My Solar Panel? Blocking diodes in photovoltaic systems serve two functions. They can prevent batteries from draining at night, and can isolate damaged or under-performing solar cells. The latter can be solved with either a blocking or a bypassing diode. Function A diode is a semiconductor device, a one-way valve for electricity. Diodes are rated in the maximum current they can pass through while on and the maximum voltage they can block when off. When the correct conditions are met, the diode will stop current from flowing. Shaded Panels Solar panels contain several solar cells wired together in series. If part of the panel is shaded, all of the cells become less efficient. Bypass Diodes A blocking diode in the panel "averages out" any shaded cells. The diode allows the loss of voltage from a shaded cell to be shared among the others, so that the panel functions more normally. Battery Drain At night, dusk and dawn, the batter...

How to Choose the Right Diode Diodes are electronic one-way valves, letting current flow in one direction but not the reverse. If you're designing a circuit that uses them, you'll need to know they have limits. They can handle a rated maximum current, and if you exceed this limit you'll destroy the part. They also have a reverse voltage limit, past which they will start conducting, possibly with damaging results. And diodes come in several different physical case styles, with leads or in a surface-mount (SMD) case. Things You'll Need Pencil and paper Calculator Circuit schematic Semiconductor catalog Instructions Evaluate the schematic at the point where the diode will be located. Determine the maximum current that will be flowing through that point and write the figure down. Determine the maximum voltage that the diode will have to sustain. Voltages are differences in potential between two points, so if one side of the diode is at 25 volts ...

How to Use a Diode to Stop Battery Drainage Diodes are used in electronic circuits to prevent electrical current from flowing in more than one direction. They are also used to push electrical current from one point in the circuit to another, such as is the case in a solar cell charging circuit. When a diode is used as a means to control the direction of current flow, it is referred to as a "blocking" diode. When solar panels are exposed to light, these panels generate electricity and can charge a battery. If a blocking diode is not present, the solar panels can also drain the battery when the solar panels are not exposed to light. Things You'll Need Protective eyewear Electrical pliers Soldering iron Secondary cell (rechargeable) battery Photovoltaic (solar) cell (equal voltage to the battery) 1N4001 diode Electrical wire Electronic (rosin core) solder Instructions Put on the protective eyewear. Cut three pieces of wire, and strip each wire of 1/2 inch ...