circuit harness wiring

The well-known LM386 is an excellent choice for many designs requiring a small audio power amplifier (1-watt) in a single chip. However, the LM386 requires quite a few external parts including some electrolytic capacitors, which unfortunately add volume and cost to the circuit. National Semiconductor recently introduced its Boomer® audio integrated circuits which were designed specifically to provide high quality audio while requiring a minimum amount of external components (in surface mount packaging only). The LM4906 is capable of delivering 1 watt of continuous average power to an 8-ohm load with less than 1% distortion (THD+N) from a +5 V power supply. The chip happily works with an external PSRR (Power Supply Rejection Ratio) bypass capacitor of just 1 µF minimum.


In addition, no output coupling capacitors or bootstrap capacitors are required which makes the LM4906 ideally suited for cellphone and other low voltage portable applications. The LM4906 features a low-power consumption shutdown mode (the part is enabled by pulling the SD pin high). Additionally, an internal thermal shutdown protection mechanism is provided. The LM4906 also has an internal selectable gain of either 6 dB or 12 dB. A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output power is possible as compared to a single-ended amplifier under the same conditions (particularly when considering the low supply voltage of 5 to 6 volts).

Circuit diagram:

When pushed for output power, the small SMD case has to be assisted in keeping a cool head. By adding copper foil, the thermal resistance of the application can be reduced from the free air value, resulting in higher PDMAX values without thermal shutdown protection circuitry being activated. Additional copper foil can be added to any of the leads connected to the LM4906. It is especially effective when connected to VDD, GND, and the output pins. A bridge configuration, such as the one used in LM4906, also creates a second advantage over single-ended amplifiers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage exists across the load.

This eliminates the need for an output coupling capacitor which is required in a single supply, single-ended amplifier configuration. Large input capacitors are both expensive and space hungry for portable designs. Clearly, a certain sized capacitor is needed to couple in low frequencies without severe attenuation. But in many cases the speakers used in portable systems, whether internal or external, have little ability to reproduce signals below 100 Hz to 150 Hz. Thus, using a large input capacitor may not increase actual system performance. Also, by minimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized.

We will now show you the wiring diagram of the 1958 Studebaker and Packard Golden Hawk and Packard Hawk. This is a very clear and very much readable wiring diagram, so it should be easier for you to study them before performing any wiring work with your car.

Some of the parts you will see here are such as low beam, high beam, parking light, starter solenoid, starter, generator, breaker, condenser, overdrive kickdown switch, temperature gauge engine unit, current regulator, horn relay, supercharger solenoid, solenoid switch, etc. See also some colors codes here, they refer to the wire color names connecting each parts.

You can save this image in your computer for future wiring work, its easy and free. Right click on image, click save image as, choose saving location, and save image.

Finding auto sound systems that can keep up with the constantly evolving technology of today is a real challenge for many car and sound enthusiasts not only around the nation but also around the world. There was a time in the not so distant past when car stereos that had CD players or CD disc changers where the cutting edge of technology. New technology however has nearly rendered the CD players in cars as obsolete as long forgotten 8-track players. The sad news is that many carmakers are clinging to the old days and only offer something as modern as cassette players as standard equipment for auto sound systems.

I think those days will soon be forgotten, as cassettes are no longer even in mainstream production. You should also find that as CDs are rapidly becoming replaced by MP3s that take up very little space in our cars and homes, one day very soon we may see that music companies have decided it is no longer cost effective to produce CDs and render all music to digital formats. So, what does this mean for auto sound systems? Its actually good news for savvy manufacturers are well as savvy consumers who have their eyes on the future and the growing role technology is playing in our lives and as well as our commute to work.

Weve seen a recent introduction of satellite radio to our selection of auto sound systems. These stations offer the allure of no commercial interruptions to your music play in exchange for the price of a monthly subscription. At the moment there are two major companies that offer this service to consumers and each have rather proprietary equipment for their use and installation into your car. They are actually offering some rather tempting offers in order to encourage subscribers. Among those wonderful offers are auto sound systems for your vehicle at less than $100 with a prepaid year of subscription services.

For the satellite radio companies this indicates a constantly growing pool of prospective subscribers and the cost of the equipment is a drop in the bucket when compared to customer loyalty and being on the cutting edge of sound technology. The drawback is that you must decide which service you wish to go with before making the purchase. Also while they offer a very nice auto sound system (bare bones kind of kit that only allows for the radio reception in most cases) at a very sweet price, if you want upgrades such as MP3 compatibility, CD players, CD changers, DVD players, GPS, or any number of other new and advanced technology you will still have to purchase those for your sound system at an upgraded price. There are a few packages that come with these things, but the price is a little on the hefty side. Oh the sacrifices we will make for a more enjoyable daily commute.

Know what your expectations are before you decide to purchase the auto sound system of your dream or you could find that it is more the stuff that nightmares are made of than sweet dreams. Do not live in constant fear that if you buy today you will find something you like better 6 months from now, that is a reality. Technology is growing and evolving at a frightening pace. Find the auto sound system that you like best today and make that your purchase. This is a much better option than waiting around indefinitely and purchasing one just as your warranty expires on your car and its time for a trade in and another auto sound system.

The iPod story seems to be that of a charmed life. If you havent taken a look around there are all kinds of devices and accessories that are created in order to use right along with the wildly popular and successful iPod product offered by Apple. In fact, I cant think of a better coup for Apple to have pulled off against the giant PC industry, even Microsofts new product the Zune is having a great deal of difficulty even catching up to the sales that iPod seems to have no trouble garnering. The success is something that may define explanation but could have a great deal to do with the equally popular accessories and adornments that are made for each and every iPod product.

You might be wondering exactly what this has to do with auto sound systems but those are just another of the many great iPod accessories that can be found in the market place of today. Seriously! Even some car manufacturers are having upgrades that include iPod adapters that allow drivers to play music from their iPods through the tuning device on their auto sound systems. It almost seems too good to be true when you consider that you will not have to risk life and limb by fiddling with your iPod device when looking for that one obscure song somewhere on your list. There are other car stereo makers that have devices and adapters that read and play music from the iPod but you must use the actual iPod to make your selections and any changes. At any rate, when carmakers and stereo manufacturers such as Pioneer and Alpine are creating stereos that have the iPod in mind you can rest assured that it is a cultural phenomenon and not some fluke to be taken lightly.

In addition to auto sound systems you will find iDogs, iPets, iPod covers, iPod players (speakers and docking stations that you plug your iPod into in order to play without the headphones), iPod alarm clocks, and my personal favorite iBaby (this is a stroller made by Kolcraft that has an iPod, speakers, and adapter built in so that baby can hear his or her favorite tunes while being strolled about the town), or the iCrib (another nifty iPod device designed to keep baby pacified-hopefully this nifty gadgets are drool proof). Needless to say there are times in life when its all about the accessories and I have yet seen another maker of MP3 type devices hold a torch to iPod when it comes to offering options for buyers to personalize their music makers.

If you are in the market for an auto sound system, chances are that you either already have an iPod or are seriously not opposed to the idea of owning one. If you either or both are in your near future I highly recommend you consider purchasing an auto sound system that will be completely compatible with your iPod system or any other MP3 type player you choose to use. I do believe however, that you will find better options designed with the iPod in mind as none of the other brands (thus far) have nearly the buyer base and purchasing power of iPod owners. No matter how you feel about it, all indications are that iPods are here to stay and you may as well jump on board when it comes to your auto sound system as well.