Schematic Rise

Showing posts with label sound. Show all posts

Thursday, November 13, 2014

LED Sound level display circuit by using IC LM3915

This circuit is about audio sound level LED display, indicator, monitor or you can say it “Audio VU (Volume Unite) Meter”.
This is a simple audio sound level LED display circuit diagram. The circuit is completely based on a single ic LM3915 from National Semiconductor. The LM3915 is a monolithic integrated circuit. It displays the audio sound level in terms of 10 LEDs and providing a logarithmic 3 dB/step analog display.

Audio sound level display circuit diagram

Fig: Circuit diagram of sound level display using ic LM3915

The audio sound level LED display circuit can operate from a single supply 3V to 25V. But I suggest to use 9-12V. LED brightness can be controlled with a single pot( variable resistor) as shown 10K ohm in the circuit. Connect the audio input signal in Pin-5 of LM3915 from output of a audio device like output of audio amplifier or any other source.

The Pin-9 of LM3915 is to select dot or bar mode display. To make the circuit moving dot display instead of a bar graph display disconnect the Pin-9 from +V.

Thursday, October 16, 2014

Simple Sound Activated Lamp Relay Switch

This simple Sound-Activated Lamp circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car’s LED light show. The Q1 amplify the audio from mic. The R1 is used to adjust the peak of signal to greater than about 0.7 volts, act as sensitivity adjuster. A certain level, the signal coming from microphone, after amplification by Q1, will trigger the SCR and light lamp I1. If we change the lamp with a relay, then we can get a sound-activated relay/switch, which can be used to control more powerful / high wattage high voltage lamps. If we use a relay, place a 1N4007 diode in parallel with the relay coil to prevent the back-emf from relay coil destroying the SCR.

Sound-Activated Lamp Circuit Diagram

Wednesday, September 3, 2014

Is Bigger Better in Auto Sound Systems

When it comes to auto sound systems, one question seems to be repeated often-is bigger better? The honest answer to that is not by a long shot. There are many excellent quality sound systems that will not require the backseat and your first-born in order to enjoy wonderful quality of sound and music as you drive along on your daily commute. One thing that is important to remember is that dynamite does in fact come in small packages. The same can be true of a good quality sound system for your car, truck, or SUV.

You can elect to have the full range sound package. This package, if not custom installed by the dealer can take up a great deal of real estate within your car, truck, or SUV. If you own a compact car, these types of speakers and this particular type of sound system is definitely not recommended. The first reason it is unattractive is that it will most likely require either the vast majority of your trunk or take out your back seat. I for one like being able to cart around friends, relatives, and/or children-my back seat isnt up for grabs. I also prefer the continuity of a factory-installed system that takes up none of the premium living space within the interior of my SUV.

I am personally biased towards the wonderful sound quality of the Bose sound system and speakers. The quality of sound with this particular system is excellent and any true music lover will tell you that good quality of sound is better by far than a louder sound. This is not to say that the Bose sound system will be the perfect choice for everyone to use as his or her auto sound system only that it is my first choice as a music lover.

I prefer a softer sound that has good quality to a louder sound of the substandard or even average quality on any day. The problem with most big sound systems and speakers is that they often sound hollow or tinny rather than full and robust. A good auto sound system will provide the best possible sound within the confines of the least possible space. You will probably find that you dont need to sacrifice your backseat in order to hold the speakers and while the Bose sound system for automobiles does cost more than some sound systems, it wont require a second mortgage on your home in order to afford. There are actually times in life when you get what you pay for.

The important thing to remember is that you do not have to have the most expensive, the best known, or even the biggest sound system in order to have a wonderful quality sound system in your automobile. You will not even have to have a Bose sound system in order to have a sound system that is not only excellent quality but also excellent sound. You do not need to pay an arm and a leg or any other appendages in order to have a good sound on your daily commute to work.

Music is all around us, at work, at home, on television shows. Music sets moods, sets tones, and kills moods on occasion. It only makes sense that you have good quality equipment upon which to play the music that so greatly enhances and enriches your life. If you are in the market for an auto sound system it only makes sense to listen to several before deciding on the one that will work best with your musical tastes and your desire for your vehicle sound system. Dont be misled by commission minded sales associated that think you need the latest, greatest, and most expensive toy on the market. Find a system that sounds good to you and go with that system. You do not have to go for a better sound if you find a sound you like that should be enough.

Friday, August 29, 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.

Tuesday, August 26, 2014

Alarm Sound with Control Switch

The heart of this circuit is IC No. 555. When the alert sound was working, even though the switch will continue to be the same, the sound still does not stop immediately.But it will stops automatically, when a set time period,Depending on the resistance of R3, the circuit so I set a time period equal to 1M for 1 minute 6 seconds.

Alarm Sound with Control Switch

The output of IC 555 is triggered by a positive voltage on pin 2,when all switches are connected together.When the something switch is cut off pin 2, it will be negative voltage and the trigger IC 555 will stop. The C1, C4 to protects a noise signal from either switch, which may cause the alarm to be up. This circuit can be used with power supply from 5V to 15V depending on relay sure enough.

Sunday, August 24, 2014

Simple Sound Activated Switch

Simple Sound Activated Switch Circuit diagram : Control by sound may be very useful, not just on a robot but also for a bit of home automation, for example a sound activated light responding to a knock on the door or a hand clap. The light will be automatically switched off after a few seconds. An alternative use is burglar protection — if someone wants to open the door or break some-thing the light will come on, suggesting that someone’s at home. The schema can work from any 5– 12 VDC regulated power supply pro-vided a relay with the suitable coil voltage is used.

Simple Sound Activated Switch Circuit diagram :

Sound Activated Switch Circuit Diagram

When you first connect the supply voltage to the schema, the relay will be energised because of the effect of capacitor C2. Allow a few seconds for the relay to be switched off. You can increase or decrease the ‘on’ period by changing the value of C2. A higher value results in a longer ‘on’ period, and vice versa. Do not use a value greater than 47 µF. Biasing resistor R1 determines to a large extent the microphone sensitivity. An electret microphone usually has one internal FET inside which requires a bias voltage to operate. The optimum bias level for response to sound has to be found by trial and error.

All relevant electrical safety precautions should be observed when connecting mains powered loads to the relay contacts.