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| E L E C T R O N I C S |
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| CAR AUDIO AMPLIFIERS |
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| The engine for a sound system is the amplifier. The amplifier takes the music signal, and makes it powerful enough to operate a speaker. In most car sound systems, the only amplifier is found in the head unit (the radio, cassette or CD player in the dashboard). The problem with relying on these amplifiers is that they are too small. They simply cannot put out enough power. |
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| What To Look For? |
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| 1. Power- Match Your Car Speakers & Car Amplifier Car amplifiers boost the signal your stereo sends to your car speakers, driving your speakers with an independent power source. You'll see two power ratings when shopping for a car amplifier: RMS (Root Mean Square) power and Peak power. Power is often equated with loudness, the more powerful your amplifier, the better the dynamics and the sound quality. So more is better. A pretty good barometer: if it's over 100 watts per channel, it cranks. However, someone just looking for better sound may only need 50 watts per channel. |
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| 2. Channels- Match Your Car Speakers & Car Amplifier There are three types of car amplifiers: mono, two-channel, and four-channel. A two-channel amp is designed to power two speakers. A four-channel amp, four speakers and so on. If you are looking for one amplifier to power your entire system, you need an amp with at least four channels. If you are looking to install a multi-amp system, then you can consider amps with less channels of amplification. |
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| 3. Speaker Wiring In most cases, speakers designed to use in your car are rated at 4 ohms. An ohm is a measure of how hard it is to force electricity though a conductor. The lower the number, the easier it is for electricity to move. |
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| CAR AUDIO SUBWOOFERS |
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| Most car speakers are relatively small and aren't capable or reproducing the bass found in virtually any type of music. With a subwoofer, you get music you feel, not just hear. In order to get that true "cinema" sound in you car, you need a subwoofer to make your listening more enjoyable. |
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| What To Look For? |
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| 1. Sound Quality: |
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| 2. Power Handling: |
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| 3. Size: |
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| 4. Type of Box: |
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| FLASHLIGHTS |
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| CURRENT REGULATION |
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| In most power supplies, current is not regulated directly. Fuses and other circuit protection devices are used to set an upper limit on the amount of current that can flow in a power supply. Once this limit is exceeded, the fuse simply opens and the power supply is deenergized. Beyond this, current is usually left unregulated because the load will draw from the power supply only the amount of current that it needs. Decreases and increases in the power supply voltage caused by the variations in load current are usually controlled by the voltage regulator. |
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| LEDs (Light Emitting Diodes) |
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| Developments in light and electronics technology over the last few years have led to the widespread availability and use of LEDs (light emitting diodes) as the light source for flashlights and other lighting equipment. Unlike ordinary flashlight bulbs, LEDs don't generate a significant amount of heat, and because there is no filament to burn out, they typically last for thousand of hours. LEDs are basically tiny light bulbs that fit into an electrical circuit and are illuminated solely by the movement of electrons in a semiconductor material. |
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