Showing posts with label sound. Show all posts
Showing posts with label sound. Show all posts

Tuesday, November 4, 2014

Car Alarm Sound Booster

For car alarms, emphasis should be put on hearing the audible alert and identifying it as belonging to your ‘wheels’. Unfortunately, modern car alarm systems seem to have more or less the same alarm sound especially if they are from the same brand. Also, to comply with legal noise restrictions, the alarm sound is not always loud enough to be heard if the car is parked down the road.

The circuit shown here is designed to help boost the alarm sound by also activating the car’s horn(s) when the alarm goes off.Internally the car alarm system often provides a signal that activates the (optional) engine immobilizer and/or volume (ultrasound) sensors. This signal usually goes Low upon system triggering and high again when the alarm system is deactivated.

Car Alarm Sound Booster Circuit Diagram :

 booster-circuit diagram

The alarm activation signal is fed to the circuit through D1. When in idle state, T1’s gate is High and consequently the FET conducts, keeping power FET T2 firmly switched of f. When the system gets an active low signal, T1 switches of f allowing timing capacitor C2 to charge via R2. About 15 seconds later, when the voltage across C2 is high enough, T2 starts to conduct and relay RE1 is energized. This, in turn, provides the required path for the ‘lights flashing’ signal to energize RE2 and feed battery power to the car’s horn(s).

When the alarm system is turned off the activation signal returns to High. T1 starts to con-duct and rapidly discharges C2 via R3. T2 is then cut off and RE1 is de-energized. Diode D2 suppresses back EMF from RE1.The circuit draws less than 2 mA when idling. When activated the circuit’s current consumption is virtually that of the RE1 coil.RE1 is any simple SPST or SPDT relay, capable of switching about 0.5 A (at 12 V). The coil rating is for 12 VDC and a current requirement as low as you can find. Fuse F1 should be a slow blow type and rated about twice RE1’s coil current.

The BS170 in position T2 can sink a continuous current of about 0.5 A. However, a value of 1.2 A pulsed is specified by Fairchild for their devices. To keep the FET’s d-s current due to C2 discharging within safe limits, R2 may be increased, C2 decreased and R3 increased, all proportionally. A factor of 2 will keep the FET out of harm’s way with maybe a slight change in the 15-second delay and the sensitivity of the circuit.C1 is used as a smoothing capacitor and F2 should be rated in accordance with the horn(s) maximum current draw.

Caution.The installation and use of this circuit may be subject to legal restrictions in your country, state or area.

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Sunday, September 14, 2014

Modifying your Auto Sound System

If you are one of the many people around the world who happens to be into cars and the new pastime called modding Im sure you have considered the implications of modding your auto sound system. For many the idea of modifying an automobile is very exciting. Its a way to take the standard canvas purchased from the dealer and turn it into a work of art that you drive to work and play each and every day. The same theory holds for your sound system as well. You can take the basic pieces and parts and turn them into something so much more than they were to begin with.

If that isnt enough you can purchase all kinds of LED lights and other nifty gadgets that glow and go along with your car while dancing to the beat. If you want to make a splash driving down any boulevard, this is definitely one way to not only be seen but also leave a lasting impression. Your creative genius with your auto sound system will cause quite a stir and give plenty of people much to discuss the next morning and plenty of people a great deal of inspiration to try to mimic or at the very least incorporate into their units somehow.

There are all kinds of sound systems for automobiles. Many of these systems are sold as part of a package and readily available to multiple consumers. You have the option as a creative modding genius, to take the plane Jane package and turn it into something so much better than it is or to even go off on a tangent and invent a total package of your own by mixing and matching pieces and parts from several different packages or pieces of packages.

It doesnt matter where your creativity ends and begins there is never a challenge too great for a true modder at heart. From cars, trucks, boats, and computers to car stereos there is no task too demanding or too complicated for a true modding mind to tackle and transform. Perhaps its the blinking lights or all the wonderful possibilities that abound but auto sound system mods are among my favorite to see in action. Its amazing the things that can be thought up by a wicked imagination and accomplished with a little time and a lot of effort.

Seriously though, if you are going to go to all the trouble of dressing up your vehicle shouldnt you also take the time to dress up your auto sound system? There are all kinds of gadgets and gizmos you can buy that will work with the music your speakers are pumping in order to create a fabulous overall affect of music and light that is sure to get some great reactions from those you cruise on by. These are perfect accessories for summer time beach driving if you know what I mean. Growing up on the coast, I found a great section of people who were constantly modifying their cars and sound systems. I think it is incredibly amazing what can be done with metal, glass, color, light, and sound and really enjoy seeing all of the amazing creations that are made.

Even if you havent really given much thought to modifying your auto sound system before, I hope that you will consider it now if you are a serious modder. I honestly believe you might amaze yourself at some of the fabulous tricks of sound and light that you can come up with when properly challenged and inspired.

Take the time to check out the interesting things that have been done, and then formulate a hypothesis on what can be done. It is truly amazing the wonderful things that have been created as the result of a glove being thrown so to speak. Jump in and create a fabulously modified sound system that will be the absolute envy of everyone you pass along the way.

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Saturday, September 13, 2014

Sound Activated Lights

This diy sound activated lights schema 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.

 Sound Activated Lights Circuit Diagram



Assemble the sound activated lights schema on a general purpose PCB (schema board) and enclose in a plastic cabinet. Power to the sound activated switch schema 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 schema. 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 schema 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 schema. We will not be responsible for any kind of resulting loss or damage.
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Wednesday, September 10, 2014

SOUND 2W MONO AMPLIFIER TDA7299

Features:

  • CAN DELIVER 2W THD 10% 12V/8Ω
  • INTERNAL FIXED GAIN 20dB
  • NO BOUCHEROT CELL
  • THERMAL PROTECTION
  • AC SHORT CIRCUIT PROTECTION
  • SVR CAPACITOR FOR BETTER RIPPLEREJECTION
  • LOW TURN-ON/OFF POP
  • STAND-BY MODE
Circuit Diagram:
Circuit diagram for SOUND 2W MONO AMPLIFIER

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Saturday, August 30, 2014

Simple Sound VU Meter Wiring diagram Schematic

This schema is a sound level meter, very simple, but very effective for your sound system or test bench. This type of schema is also called a VU meter. Abbreviation means "unit volume" is used to express that the average value of a music signal over a short period of time.

Sound VU Meter Circuit Diagram

Sound


The VU meter described here is what is called a type "passive". This means that does not require a separate power source, since the power is supplied by an input signal. This makes it easier to use:. Just connect it to the speaker terminals (polarity does not matter) and is ready to use.
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Friday, August 22, 2014

Auto Sound Systems are Becoming Entertainment Systems

If youve been shopping lately for an auto sound system then I am fairly certain that youve come across several full entertainment systems among those in the running for your audio and entertainment dollars. Vehicles today offer everything from DVD players, individual speakers, headphones (also individually adjustable), and even dual players that will allow one different audio to be played in one section of the vehicle than another. In addition to all of these wonderful and nifty devices are many more devices that are meant to tempt, sway, and convince you to spend even more money on the auto sound system of your dreams. Some of these even offer MP3 players that connect directly to the audio system of your car, truck, or SUV.

The jury is still out for many people about the safety and sense of having a DVD player in your automobile. While this is the case, people will continue purchasing DVD players are part and parcel of their sound and entertainment systems and manufacturers will continue putting together attractive packages that offer these devices to consumers while offering incredible bargains on installation. I know that many feel that this is an unnecessary distraction to drivers. Im one of the rare people that feels that in a day of laptops, cell phones, talk radio, fast food, Starbucks coffee, and multitasking, a DVD in the back might be one of the best features that can be added to the car in an effort to minimize distractions coming from the direction of disgruntled passengers in the rear.

I will confess that many people wonder what this has to do with an auto sound system and I can understand that question so please bare with me. One of the features that sound system manufacturers are offering is a feature that allows individual headphones for passengers in the back along with LCD monitors that rest in the back of the head rests so that passengers in the back can both see and hear the DVDs being played without causing a distraction for the driver (either by noise or by means of flashing lights).

The truth of the matter is that having the noise from a DVD player in the back is no worse of a distraction than having disgruntled children competing for your attention from the backseat or listening to audio books as you drive along. I must admit that audio books are one of my current and readily admitted addictions. The problem with those is that on occasion some of the books simply arent meant for young ears. I try to keep my books limited to popular stories that are suitable for children whenever my children are riding along and save the sometimes steamy and often hilarious tales of Stephanie Plum for when Im riding alone. Another great reason to make sure you have an auto sound system that at the very least reads and understands MP3s.

The technology exists for this and I expect to see even more innovations technologically speaking in the way of auto sound systems and entertainment systems in the near and not so near future. We live in a world where technology is constantly evolving and we should see many new and wonderful features that will make our lives much more enjoyable for our daily commute.

Whether you are new to the technology of today, fighting it mightily, or happily embracing it-it isnt showing any signs of stopping or slowing down. This means that you will eventually have to face the fact that the old ways of buying an auto sound system will soon be obsolete. I often joke that we are rapidly becoming a society that is catching up with the "Jetsons" vision for the future. I also loudly lament my lack of a Rosie. At any rate, I am glad to see that the new technologies in auto sound systems are offering less of a one size fits all image and offering much more individual systems, even for passengers within a vehicle.

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Wednesday, August 20, 2014

Simple Sound Scanner Wiring diagram Schematic

This novel sound scanner sweeps all sound vibrations in its vicinity and converts them into audible beeps. It can sense sound vibrations up to a distance of 6 metres and can be used to monitor sitouts, car porchs, and other places of your house. The sound scanner operates a beeper whenever the microphone detects a sound.

Simple Sound Scanner Circuit Diagram


Simple


Sound vibrations are sensed by the input section comprising the condenser microphone and op-amp IC 741C (IC1). Resistor R1 determines the sensitivity of the microphone. Condenser microphone picks up sound vibrations and converts them into electrical signals, which are fed to the input (pin 2) of IC1 via coupling capacitor C1. Amplified signals from IC1 are taken to the non-inverting input pin 3 of IC2 (IC 741C) through C2. IC2 is configured as a comparator.

A reference voltage controlled by VR2 is applied to the inverting input pin 2 of IC2. The output of IC2 is used to trigger Darlington pair transistors T1 and T2. A piezobuzzer connected to the emitter of T2 produces audible beeps as the microphone senses sound.

The schema can be easily assembled on a common PCB or Veroboard. Adjust VR1 to get the maximum gain of IC1. Adjust VR2 to get the maximum sensitivity of IC2.

If a continuous beep is heard through the piezobuzzer, adjust the wiper of VR2 towards the ground line. Keep the piezobuzzer inside the room and the sensor in the place that is to be monitored. Connect the condenser microphone using a two-core shielded wire and enclose it in a small case to increase its sensitivity. Battery operation is recommended as the schema may pick up noise from AC mains.

This schema costs around Rs 60.



Sourced By: EFY:Author :  D. Mohan Kumar
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