Showing posts with label auto. Show all posts
Showing posts with label auto. Show all posts

Thursday, October 23, 2014

Evolving Technology and Auto Sound Systems

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.

Thursday, October 16, 2014

Simple Auto Turn Off Battery Charger Circuit Diagram

This Auto Turn-Off Battery Charger Circuit Diagram for series-connected 4-cell AA batteries automatically disconnects from mains to stop charging when the batteries are fully charged. It can be used to charge partially discharged cells as well. The circuit is simple and can be divided into AC-to-DC converter, relay driver and charging sections. In the AC-to-DC converter section, transformer X1 steps down mains 230V AC to 9V AC at 750 mA, which is rectified by a full-wave rectifier comprising diodes D1 through D4 and filtered by capacitor C1. Regulator IC LM317 (IC1) provides the required 12V DC charging voltage.

 Auto Turn-Off Battery Charger Circuit Diagram

 auto turn-off battery charger circuit diagram




When you press switch S1 momentarily, the charger starts operating and the power-on LED1 glows to indicate that the charger is ‘on.’ The relay driver section uses pnp transistors T1, T2 and T3 (each BC558) to energise electromagnetic relay RL1. Relay RL1 is connected to the collector of transistor T1. Transistor T1 is driven by pnp transistor T2, which, in turn, is driven by pnp transistor T3. Resistor R4 (10-ohm, 0.5W) is connected between the emitter and base of transistor T3.

When a current of over 65 mA flows through the 12V line, it causes a voltage drop of about 650 mV across resistor R4 to drive transistor T3 and cut off transistor T2. This, in turn, turns transistor T1 ‘on’ to energise relay RL1.


Now even if the pushbutton is released, mains is still available to the primary of the transformer through its normally open (N/O) contacts.  In the charging section, regulator IC1 is biased to give about 7.35V. Preset VR1 is used for adjusting the bias voltage. Diode D6 connected between the output of IC1 and battery limits the output voltage to about 6.7V, which is used for charging the battery.  Pushing switch S1 latches relay RL1 and the battery cells start charging. As the voltage per cell increases beyond 1.3V, the voltage drop across resistor R4 starts decreasing. When it falls below 650 mV, transistor T3 cuts off to drive transistor T2 and, in turn, cuts off transistor T3.

As a result, relay RL1 de-energises to cut off the charger and red LED1 turns off.  You may determine the charging voltage depending on the NiCd cell specifications by the manufacturer. Here, we’ve set the charging voltage at 7.35V for four 1.5V cells. Nowadays, 700mAH cells are available in the market, which can be charged at 70 mA for 10 hours. The open-circuit voltage is about 1.3V. The shut-off voltage point is determined by charging the four cells fully (at 70 mA for 14 hours). After measuring the output voltage, add the diode drop (about 0.65V) and bias LM317 accordingly.


Author : Y.M. Anandavardhana

Sunday, September 14, 2014

AUTO fast battery charger for cars


This schema is a fast and auto car charger schema.By using this one you can charge your lead acid battery easily.After charging the battery this schema will cut off the power to your battery. so this is very useful schema for you.






Note

# use IC 7805 as power supply for this schema
# LM311 control test volt battery.
# Use PCB To build your schema.
# Be careful when you deal with 230v

Saturday, September 6, 2014

Ebay has Surprising Bargains on Auto Sound Systems

Articles - Anyone that is familiar with Ebay knows that it is a literal one stop shop when it comes to hundreds of thousands of unique and common new and used items. It should then, come as no shock that Ebay is also a great place to find excellent bargains when it comes to auto sound systems. Yes, you heard that correctly. While you cant exactly test out your tunes over an Internet connection you can generally check out the exact same brands youll find at Ebay in your local automotive stereo and entertainment dealerships. The difference is that you can generally get your hands on the merchandise from Ebay at a fraction of the cost you would pay retail.


Many people often find better deals when going through Ebay than they would even be able to find at many retailers online. I am constantly amazed at the wonderful bargains that can be found on Ebay not only when it comes to auto sound systems but full entertainment packages for your vehicle. Not only can you find great bargains on sound systems for your vehicle you also can find some thrifty deals on amplifiers, subwoofers, speakers, speaker systems, and tools, tips, and tricks when it comes to installation.

While there is the fact that you cant hear the system for yourself if you purchase it on Ebay that can be easily overlooked by going to local retail stores in search of the same system. That should give you a very real indication of what the system you are considering on Ebay will sound like. You should look at local stores and online before making the bid on Ebay in order to compare prices and bid with confidence that you are in fact getting a bargain. Also be sure you pay attention to shipping and handling fees that might be involved in your package delivery. Ive found that with a select few Ebay retailers, they kill you on the handling expenses.

Another drawback with Ebay is the lack of customer service after the sale. Be sure to pay close attention to the ad details concerning customer satisfaction and recourse should something go wrong with your package. You should also be sure that you always purchase the insurance on your package should you win the bid. Even at discounted priced, auto sound systems are a pretty hefty investment and you should take care that you protect that investment.

The only serious drawback I have found to buying from Ebay when it comes to auto sound systems is the fact that you have to have your system installed. Installation simply doesnt come with these car stereos and not all installers are willing to do the installation if you didnt purchase the product from them. Installing an auto sound system isnt the simplest of tasks and you need to have a plan in place to get the system in your car before you commit to the purchase.

Whether you have serious plans to purchase an auto sound system in the near future or you are simply entertaining the notion, it is definitely worth checking out the wonderful options that Ebay has for your automotive listening pleasure. We live in a world where every penny seems to count, see how many you can save by shopping Ebay.s

Friday, August 22, 2014

Simple 12V Auto Powered Wiring diagram Schematic

This Simple 12V Auto-Powered Circuit Diagram For Cassette Recorders. In this schema A regulator allows you to power a 7.5-V cassette recorder or other device from a 12-Vdc auto system. About 600 mA is available from the schema. Q3 should be heatsinked because it dissipates up to 4 W. F1 should be a slow-blow fuse so that the surge caused by CI does not cause unnecessary fuse failures.

Simple 12V Auto-Powered Circuit Diagram