Friday, November 22, 2013

Home theater design may require professional help

Having to be able to bring home entertainment may be a luxury. This is because only very few households can afford home theater system. Of late, only the rich and the famous can afford such luxury. This notion is now a thing of the past. Home theater systems may now be available to greater number of households because of the knowledge of basic home theater design. The basic home theater design may only require three basic components and these three components may already be affordable for the working class.


Home theater design However, before you may need to think of the basic home theater design for your home theater system, you may need to know the size of the room for the home theater set up. The size of the room to where the home theater will be set up will depend on how basic the home theater design needs to be.

Home theater experts recommends that if the room is quite small, all you need for your home theater design is a television set, three speakers and a DVD player. The home theater design may be dependent of the shpre of the room; however, the position of the speakers remains to be the left, the right and the center of the room. Basic home theater design may require a television set bigger than 27 inches. Too small screen for your home theater design may not be sufficient for a movie theater-like experience. 

This is because even for the home theater design, you may need to consider the sight and sound of a movie theater. It is the main consideration why people go to a movie theater, the big screen and the surround sound. With respect to the surround sound of a movie theater, the basic three speakers is only applicable for smaller rooms, if the room is bigger, the home theater design needs to be more than three, you may go up to six speakers and a complimenting subwoofer may be necessary for the surround effect. Going back to a small room, if you will only put three speakers, you may want to consider buying a high quality brand speaker; this will give you enough surround sound for a smaller room. 

If you have a small budget, ensure that the store where you will buy your speakers will allow you to test the product in your room and if it will not give you a good surround sound, they should allow you to return or replace the unit. This is because some speakers sound good in the store but when you finally set them up in a small room, the effect is not very good. Find a neat deal where they can allow you to return or replace the speakers. However, if your budget is sufficient, you may consider hiring the services of a home theater designer. 

Your home theater designer will be able to design the home theater better and with complete accessories. He may require checking the power rating, and the need for amplifiers. He may also recommend using home theater projectors and he may recommend how the speakers need to be. You will get a good home theater design if you will be able to hire home theater designers. The need for home theater seating and television cabinet may also be necessary for the complete package of your home theater.

You may enjoy the entertainment without having to tide traffic jam and enjoy in your own home theater system. 

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2 way Active Crossover

Therefore this architecture represents the simplest access I could booty and still get the adapted outcome.The band akin audio arresting enters the absorber area it is astern out of phase.This is to atone for the filters which will alter the appearance afresh appropriately abiding the arresting to it’s able phase. The filters are more-or-less accepted low and aerial canyon filters appropriately however, added capacitors and resistors accept been added in adjustment to get the altruism bottomward to a minimum appliance alone E12 components.


This alive Cantankerous over is adequately beeline forward. It consists of a absorber and two 3rd order, 18 dB per octave filters. One low canyon and the added high. The cantankerous over abundance is set at 2Khz and is advised for AEK’s 400watt per access PA/Keyboard Amp systems. Obviously alone one access is apparent here.

This ambit may not be of awfully abundant use to anyone as it was accurately advised to clothing the applications. It is not capricious or switchable for two reasons. Firstly, it didn’t charge to be back the backdrop of the apostle arrangement were already known. And secondly, the added complication was put into the accurateness of the crossover rather than it’s flexibility. The filters are akin in account to anniversary added as able-bodied as can be accepted appliance alone E12 components. If switching were to be active to accord a ambit of abundance options, a accommodation would accept to be fabricated on clarify accuracy.

The alone added way to accomplish a accepted crossover architecture and advance accurateness would apparently be to use Switched capacitor clarify architecture blocks. In theory, two 18or 24dB per octave filters could be complete such that they tracked anniversary added by actuality bound to the aforementioned clock. This would be a nice agreement but I haven’t had the befalling to prove this technology for this affectionate of application. My primary affair was the breach through of switching babble appliance such a design.
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Power supply with driver TEA1507

Power supply with driver TEA1507 is mostly used by TV branded PHILIPS. Power Supply has an efficiency rate of up to 90% - thus requiring less cooling, as well as stand-by power required is less than 1 watt.


Power Supply with TEA driver is equipped with a variety of surge protector that has a high reliability - not easily damaged if any part of a damaged power supply circuit and power transistor or FET heat is not easily damaged. Power supply circuits are dapatapat working on ac input voltage between 85 up to 275v. The way it works with the driver circuit power supply TEA 1507 is quite simple, so easy tracking of damage to the circuit.

Power supply with driver TEA1507

The picture above is the basic power supply circuit with TEA1507
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LM139 Measure delay generator

Measure delay generator (in addition identified in the same way as sequence generator), is a device which long for provide output signals on prescribed time intervals from a time reference to and will unconsciously reset while the input hint returns to ground. under schematic illustrates the design of a measure Delay Generator Circuit Diagram using LM139. The LM139 skin tone from head to foot precision comparators; allows sensing come close to GND; eliminates need in lieu of dual food and power drain apt for battery setup.
 Delay Generator Circuit Diagram using LM139
 Delay Generator Circuit Diagram using LM139


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Rangkaian amplifier




Technical information

Datasheet IC 5G37
Vcc                = 6-12 V
Pout               = 0,4 W
RL                 = 8 Ohm
Ft                   = 40-17 Khz
Icco               = 15 mA
Package         = TABS1-14
Manufactered = China

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Thursday, November 21, 2013

Ultrasonic Wave Receiver Circuit

Ultrasonic Wave Receiver
Ultrasonic recipients will receive an ultrasonic signal emitted by an ultrasonic transmitter in accordance with the characteristic frequency. Received signal is going through the process of filtering using the frequency band pass filter circuit, with a frequency value that is passed has been determined.


Then the output signal will be amplified and passed to the comparator circuit (comparator) with a reference voltage determined based on the amplifier output voltage when the distance between the sensor mini vehicles with bulkhead / retaining walls to reach the minimum distance for the turn direction. Comparator output can be considered under these conditions is high (logic 1 ), while longer distances are low (logica0). Binary logics are then forwarded to the circuit controller (microcontroller).



The working principle of ultrasonic wave receiver circuit are as follows:

  • First - the first received signal will be strengthened first by the circuit transistor amplifier Q2.
  • Then the signal will be filtered using a high pass filter at a frequency of> 40kHz by a series of transistor Q1.
  • After the signal is amplified and filtered, then the signal will be rectified by diode D1 and D2 series.
  • Then the signal through a filter circuit low pass filter at a frequency <40kHz through the filter circuit C4 and R4.
  • After that the signal will go through the Op-Amp comparator U3.
  • So when there is an ultrasonic signal into the circuit, then the comparator will issue a logic low (0V), which will then be processed by the microcontroller to calculate the distance.
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Bridge Power Amplifier Using TDA7294

Using TDA7294 audio amplifier integrated circuit in bridge mode configuration , can be designed another Hi-Fi power amplifier .In this TDA7294 bridge power amplifier the value of the load must not be lower than 8 Ohm for dissipation and current capability reasons.

Bridge Power Amplifier Circuit Using TDA7294


The main advantages offered by TDA7294 bridge mode configuration are:High power performances with limited supply voltage level, Considerably high output power even with high load values ( 16 Ohm).The output power of this amplifier in bridge connection is 150 W with Rl= 8 Ohm , Vs = +/-25V the and 170 W output power for Rl=16 Ohm, Vs = +/-35V.
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