Showing posts with label sound. Show all posts
Showing posts with label sound. Show all posts
Saturday, October 5, 2013
Logic Probe With Sound Circuit
This logic probe can be selected to operate on TTL or CMOS logic levels, depending on switch S1. A string of resistors associated with switch S1 sets the threshold levels for a window comparator comprising IC1a and IC1b. Depending on whether the level applied to the probe is high or low, the window comparator turns on LED1 (high) or LED2 (low). The 1.2M and 680k resistors set the probe signal to a midrange value when the probe is open-circuit, thereby preventing either LED from being lit.
Circuit diagram:
Logic Probe With Sound Circuit digram
If a pulse signal is present, the output of IC1a will toggle the clock input of flipflop IC2a. This drives LED3 which either lights for each pulse or continuously, depending on the setting of switch S2. Finally, the outputs of IC1a & IC1b are connected by diodes D5 & D6 to the base of transistor Q1 which is connected to the Reset input of flipflop IC2b. This has a piezo sounder (not buzzer) connected between its Q and Q-bar outputs so that it produces a sound which echoes the input pulse signal.
Author: Tom Hughes Copyright: Silicon Chip Electronics
Tuesday, April 9, 2013
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.
Monday, April 8, 2013
Sound Activated Lights
This diy sound activated lights circuit turns a lamp ON for a short duration when the dog barks (or a relatively strong sound) giving an impression that the occupants have been alerted. The condenser microphone fitted in a place to monitor sound and generates AC signals, which pass through DC blocking capacitor C1 to the base of transistor BC549 (T1). Transistor T1 along with transistor T2 amplifies the sound signals and provides current pulses from the collector of T2. When sound is produced in front of the condenser mic, triac1 (BT136) fires, activates lights and the bulb (B1) glows for about two minutes.
Assemble the sound activated lights circuit on a general purpose PCB (circuit board) and enclose in a plastic cabinet. Power to the sound activated switch circuit can be derived from a 12V, 500mA step-down transformer with rectifier and smoothing capacitor. Solder the triac ensuring sufficient spacing between the pins to avoid short circuit. Fix the unit in the dog’s cage or close to the sound monitoring spot, with the lamp inside or outside as desired. Connect the microphone to the sount activated lights circuit using a short length of shielded wire. Enclose the microphone in a tube to increase its sensitivity.
Caution. Since the sound activated lights uses 230V AC, many of its points are at AC mains voltage. It could give you lethal shock if you are not careful. So if you don’t know much about working with line voltages, do not attempt to construct this circuit. We will not be responsible for any kind of resulting loss or damage.
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
Thursday, April 4, 2013
iPod and the 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.
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Wednesday, April 3, 2013
Auto Sound Systems that Offer More
Technology is advancing at an alarming pace. Many of us in the market for auto sound systems have been more than surprised at many of the choices on the market today. Sound systems have gone far beyond the simple tuners of days past and are incorporating other features into the sound system as well. Today you can find all kinds of bells and whistles with price tags to match. It would be very easy to spend two or three thousand dollars in the purchase and installation of a very nice auto sound system in your car, truck, or SUV. Most of us, however, would do just as well with a simple three hundred dollar sound system and would be unlikely to use many of the features that the higher price sound systems offer.
That being said, if you plan to be in the market for an auto sound system, a DVD players/entertainment system, an MP3 player, a CD player, and/or a navigation system for your vehicle, then you might want to select one of the more feature rich auto systems that are available on the market today. You just might find that you get more bang for your buck with these sorts of systems.These systems offer a great many features and can be found in all kinds of price ranges. Once you find the system you like I highly recommend comparing prices all around and going with the best deal you can find. Remember to include things such as shipping and/or installation in the prices as most of the more inclusive, feature rich systems are in dash systems and will more than likely require professional installation. If you can find a local retail center that is willing to install free, I highly recommend consider that as a huge perk, especially if they are close or willing to match your lowest price elsewhere.
Some of the more popular feature rich auto sound systems you can find on the market today are listed below with a very wide array of prices that I have found for them.
1) Pioneer AVIC-N2 DVD/GPS Navigation System. The price range on this system is between $750 and $1,200 without installation. This unit has DVD, CD, MP3, and navigation capabilities.
2) Alpine IVA-W200 DVD/CD/MP3 Player. These can also be found between the prices of $760 and just over $1,000. This system consists of a DVD player, CD player, and an MP3 player but doesnt have the navigational assistance and GPS.
3) Jensen VM9311TS AM/FM/CD/DVD with a 7" LCD screen. This device is priced significantly lower and has all kinds of amazing capabilities. CD/DVD/MP3/WMA/iPod and XM capable though it too doesnt have GPS or navigational assistance. The price on this system however is between $330 and $500, which makes it a pretty good bargain.
I hope you find something here that strikes your fancy and remember its never too early to begin lobbying for next Christmas. You can tell everyone what you want and hope that friends and family will pitch in and add gift certificates to your savings for the auto sound system youve been dreaming of (you might also want to plan to have a vehicle you intend to keep a while should you decide to make this sort of investment).
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