Simple Digital Switching System

This circuit can control any one out of 16 devices with the help of two push-to-on switches. An up/down counter acts as a master-controller for the system. A visual indication in the form of LEDs is also available.  IC1 (74LS193) is a presettable up/ down counter. IC2 and IC3 (74LS154) (1of 16 decoder/demultiplexer) perform different functions, i.e. IC2 is used to indicate the channel number while IC3 switches on the selected channel.

Digital Switching System Circuit Diagram :

Before using the circuit, press switch S1 to reset the circuit. Now the circuit is ready to receive the input clock. By pressing pressing switch S2 once, the counter advances by one count. Thus, each pressing of switch S2 enables the counter to advance by one count. Likewise, by pressing switch S3 the counter counts downwards.

The counter provides BCD output. This BCD output is used as address input for IC2 and IC3 to switch one (desired channel) out of sixteen channels by turning on the appropriate triac and the corresponding LED to indicate the selected channel.  The outputs of IC3 are passed through inverter gates (IC4 through IC6) because IC3 provides negative going pulses while for driving the triacs we need positive-going pulses. The high output of inverter gates turn on the npn transistors to drive the triacs. Diodes connected in series with triac gates serve to provide unidirectional current for the gate-drive.

Sorce : www.ecircuitslab.com/2012/08/digital-switching-system.html

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3M Wireless Intercom System

3M Wireless Intercom System circuit Diagram

The afterward schematic shows the 3M Wireless Intercom Arrangement Circuit and Components Diagram. The 3M Wireless Intercom Arrangement is advised for aerial reliability, compactness, and affluence of service. It is advised to accommodate two-way, radio-frequency audio advice in quick account drive-through restaurants and accessibility stores. The arrangement can be programmed to accomplish on any one of 16 altered channels to accommodate high-quality audio achievement and abate the achievability of arrest amid adjoining wireless systems.

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XM Satellite Radio Vs Sirius for your Auto Sound System Selection

If youre in the market for a new auto sound system you might want to seriously take a moment and consider whether or not you would be benefited by subscribing to either Sirius or XM Satellite Radio. Both of these subscription-based services have something wonderful to offer their subscribers and both of them require specialized equipment in order to operate. This means if you are going to wish to use either service, you will need to have decided which service before you have your auto sound system installed.

It really doesnt matter which of these you choose they each have different features that will appeal to a wide variety of audiences. You will find some wonderful competition among the two not only by way of music radio but also talk radio. If you really love talk radio you really need to subscribe to one of these in order to find a treasure chest of talk radio gems. You will find everything from the mundane to the controversial. From Oprah to Howard Stern exist in the realm of satellite radio, which seems to not only be catching on but also here to stay.

It has been commented on many times that XM Satellite Radio has a strong lead when it comes to subscriptions. This is very true but you should also keep in mind that the new subscribers seem to be leaning more towards Sirius for their satellite radio rather than going with the traditional favorite. Ive checked out the line up and cant see that one has much of a clearly defined lead over the other so I cant give a definitive reason for the massive new subscribers to Sirius or even the phenomenal lead that XM Satellite radio is currently enjoying. Regardless if this is something that might interest you, you really should check out each website and decide for yourself which, if either, is more appealing to you as well as whether that appeal is worth the investment and the monthly subscription fee.

I will say this however: XM Satellite Radio for the moment seems to have much better toys to offer consumers. That being said, Im actually quite surprised that the vast number of new subscribers are going with Sirius rather than XM. Of course, being the gadget geek that I am, I am basing that surprise solely on the fact that XM seems to have much better toys. At the moment XM is offering some really cool gadgets that double not only as XM Satellite Radio receivers but also offer GPS functionality and navigation assistance and controls. Some of these devices even go one step further and play DVDs, CDs, MP3s, among other things.

Believe me, Sirius has a lot to offer its customers as well, Im simply thrilled over select items that can be found at XM that I really havent seen adequate competition for elsewhere. On the level of music, both seem to carry similar genres, lineups, etc. The same holds true for the Talk radio line up. The only major difference I am finding between the two are the gadgets. Even the prices are rather competitive with one another. I see only one other major difference and that is the fact that Sirius offers a lifetime membership that cost about the same as the five-year plan from XM Satellite Radio. The thing to remember however is that the lifetime membership is for the lifetime of the device not the subscriber.

I should also point out that opting for satellite radio more than likely will not eliminate your need for a new auto sound system it may however pose certain requirements for the type of sound system you will be able to choose. One thing I have noticed with both companies is that there are plenty of devices from which to choose. You will have your hands full selecting the right equipment for your auto sound system upon which to enjoy the wonderful sounds that satellite radio will bring to your ears each and every day.

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Top 5 Reasons for a New Auto Sound System

If you are a fan of David Letterman, Im sure youve seen and heard his nutty and often hilarious top 10 lists. He has become famous for them and they have been often imitated but never quite aptly duplicated by many around the world. I have no intentions of trying to claim or ever hope to be as funny as Letterman but I would love to create a top 5 list of why you need a new auto sound system. The sad part is that some of this may ring true for many, if not, I bet it will at least make you smile.

5) You really hate your neighbors and secretly hope that enough loud, late night thumping from your car will convince them to move. Admittedly not the kindest reason for the need of a new auto sound system but if youve had some of my previous neighbors I am fairly certain that it isnt too bad of an idea. Just be careful not to shake too much or they may be leaving part of their automobiles behind.

4) Because you saw it on Ebay and like Weird Al Yankovich you just cant seem to refuse when it comes to last minute bargains in the worlds largest garage sale. The truth of the matter is that Ebay can be an excellent resource as far as auto sound systems go. It is important however, to remember that you really need to hear the system before you spend your hard earned money buying it and a lot of time and/or money on the installation of the sound system you select. For that reason Ebay may not be the best choice for your particular needs.

3) Because youre tired of crummy speakers that seem to play static more than music and make more popping and snapping sounds than your old fashioned popcorn popper. Speakers are often only a small part of how your sound system runs. Chances are if you are currently having speaker problems an entirely new auto sound system is going to be in order to insure that all the problems are fixed and solved to your complete satisfaction.

2) Because your Aunt Ethel who has cataracts has a better auto sound system than you. Believe me I know this one stings a little, especially when it hits home. We all hate to think that someone that is older has a more technologically hip and sound product than we do. We often like to kid ourselves into thinking that we live on the cutting edge of technology when that is probably far from the case. Aunt Ethel probably has the kicking sound system she does so that it can be heard without the assistance of miracle ear so keep that in mind before you pull all of your hair out.

And the number 1 reason you should get a new auto sound system is that the 8-trac went out of fashion long before your first child was born. Even though youve clung to the past, it has finally met its limitations of usefulness and it is time to move along and embrace the wonderful world of modern technology and what it can mean to you and the time you and your family spend riding in your vehicle. Hope you had a great smile for the day!

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