Digital control system applications

Digital Control System is a branch of the control system with continuous time processes in the region associated with the digital controller as the controller of the control elements that control systems and computing discrete time. Depending on requirements, a digital controller can be shaped microcontroller and ASIC to a standard desktop computer. Because the digital computer system is discrete, then the Laplace transform is used in the control system is replaced with the Z-transform. Therefore, you must understand about the concept of continuous time and discrete time concept.

Flow Chart - Digital Control system applications

Digital computer also has a limited precision (See quantization) extra care needed to ensure that errors in the coefficients, A / D conversion, D / A conversion, etc. do not produce unwanted effects or planned.

The application of digital control can easily be done when used in a feedback form. Since the creation of the first digital computer in the early 1940s the price of digital computers has dropped significantly. The reason this is one of the many reasons for the application of digital control systems for the control of the control system. Other reasons:

Flexibile: easy to configure and reconfigure through software

* Scalable: can be set up programs tailored to the limits of memory or storage space at no extra cost

* Adaptable: program parameters can be changed with the times

* Static operation: digital computers are much more susceptible to environmental conditions rather than of capacitors and inductors

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4W AUDIO AMPLIFIER

4W AUDIO AMPLIFIER

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FreePCB Software

Software with open source software, specializing in professional development and editing of printed circuit boards.

FreePCB program is fairly well known in Russia, but she won the main popularity in the U.S. and in India.This editor is very easy to learn and at the same time able to withstand the high demands for quality professionals PCB design.The program allows you to get results in a larger format Gerber (topology files) format and Excellon (files for drilling).These data is sufficient to order the production of boards in offices specialize in this.Besides software package supports up to 16 layers, you can work with both inch and metric units.PCB size can be up to 1524x1524 mm.Editor uses the library buildings from companies IPC, PCB Matrix and Design International.It is possible to import and export a netlist in PADS-PCB.In recent version adds verification of compliance with design rules and AutoSave results.For lovers of the printed circuit board at home, FreePCB represents the result separately for each layer in a graphical format PNG.This editor uses only hand-wiring boards, but can work in tandem with third-party avtotrassirovschikom FreeRouting.Among the few drawbacks are the lack of print option in the program.

FreePCB editor boards designed to work with the editor of schemes TinyCAD . In addition, the live broadcast will be available from the simulator netlist LTspice program FreePCB. There is an opportunity on the basis of a full and free programs to collect system through design containing simulator, editor of electrical circuits and printed circuit boards breeder.

FreePCB program written entirely in English and has no localization system. However, amateur radio enthusiast Valentin Volodin was made ​​very decent translation of manuals, which can be found on this page . There is also stored online description of the software package FreePCB buildings in Russian.

The entire software package FreePCB from the first to the last line was written by a single man named Alan Wright (Allan Wright). Talented programmer living in the United States. In addition to electronics, despite his advanced age, Alan loves to travel, skiing, and even self-piloting his own plane RV-4. To get the necessary information on the program enough to ask a question on our site.

FreePCB works on all operating systems Microsoft Windows, including the latest - Windows 7. It can be run on Linux and Macintosh using the Wine.

Distribution of the program: Freeware

Official site FreePCB: http://www.freepcb.com

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6W amplifier using TA7222AP

This is a good news for the car owners because this amp works with 12v.TDA7222AP is an excellent integrated audio amplifier which can deliver 5.8W to a 4 Ohms load





Notes.

* The schema can be assembled on a Vero board.
* Use 12V DC for powering the schema.
* The IC must be heatsinked.
* Speaker can be a 4 ohms one.
* For optimum performance input and output must be separately grounded.

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20W Stereo Amplifier Wiring diagram Schematic

The 20-W + 20-W Stereo Amplifier Circuit Diagram consists of two complete, separate 20-W RMS bridge-type amplifiers. The input signal source is brought into the amplifier through the voltage divider network, which is made up of Rl, R2, and PI. Resistor Rl provides a load impedance between the signal source and ground. Resistor R2 couples that signal to potentiometer PI.The signal is coupled by capacitor CI to the noninverting (+) input (pin 1) of internal amplifier (A) of IC1, where the signal is greatly amplified. Capacitor C2 couples the (+) input of the other (B) internal amplifier of IC1 to ground. 

That causes the input signal, which is referenced to ground, to be coupled to both amplifiers because both the inputs and outputs of IC1 (A) and IC1 (B) are connected in a bridge configuration. Notice that the output of IC1 (A) from pin 10 is connected to one side of the speaker and the output of IC1 (B) from pin 8 is connected to the other side of the speaker.

 20W Stereo Amplifier Circuit Diagram

That is why the speakers used cannot have one side connected to ground. Resistors R6 and R7 set the gain of the amplifier. Resistors R9 and R10 and capacitors C9 and C10 provide frequency stability and prevent oscillation. Capacitors C6 and C7 provide bootstrapping, which prevents distortion at low frequencies. LED LI lights up by way of a series resistor connected from the anode to +12 Vdc when power is applied.Power for both IC1 and IC2 is brought in through D1 (to protect amplifiers from reverse polarity). Capacitor Cll provides additional power supply line filtering. This booster is capable of producing 20 W RMS output out of each channel.

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Simple FM transmitter with 2N3904

In this section discuss about the series of mini fm transmitter, with broadcast coverage of about 300-400 meters. when using a 9 volt working voltage, the transmit power of about 300 meters and when using the working voltage 12 volts, the range of about 400-450 meters, depending on the antenna you use.

This scheme of simple fm transmitter

For L1 and L2 windings 5 times the wrap, you can use a pen to fill melilitnya so neat and after lepaslah content of these pens. C5 is used for placement of broadcasting frequencies, can be tuned between 88-108 mhz, to reach further use steering antenna or Yagi antenna.

Part List

C1 = 0.001uF

C2 = 5.6pF

C3 = 10uF
C4 = 10uF
C5 = 3 - 18pF Adjustable capacitor

R1 = 270R

R2 = 4.7K

R3 = 10K

R4 = 100K

R5 = 4.7K

R6 = 4.7K

Q1 = 2N2222A

Q2 = 2N3904

L1 = 5 turn

L2 = 5 turn

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Build a Car Voltage Regulator Circuit Using LM317

The car cigarette lighter socket does not only light cigarettes, but can be utilized as an electrical channel for powering tools to work on the car such as laptops and other electronic devices. The following schema diagram shows a way of powering a two-way mobile radio using the LM317T voltage regulator.

The LM317T is an adjustable 3-terminal positive voltage regulator that efficiently provides a load current of 1.5 Amps over an output range of 1.2 V and 37 V. With reference to the schema, it can accept 14 volts without any hassle and the voltage can be controlled easily with the use of a potentiometer, a 3-terminal resister with sliding contact. The whole schema will contain the following components:

 Printed Circuit Board (PCB)
Resistor 1 (R1): 270 ohms
Resistor 2 (R2): 2K carbon potentiometer
Capacitor 1 (C1): 100nF
Capacitor 2 (C2): 1uF tantalum
LM317T Voltage Regulator
Heat Sink
DC Power Jacks
Green LED: Power
Red LED: Over Voltage
Zener Diode: over voltage LED switch

The zener diode switches on the over voltage LED if the voltage passing through is larger than the breakdown or preset voltage. The use of zener diode permits a constant amount of voltage and can be very beneficial for devices that inputs the same amount of voltage.

LM317T is cheaply available in the market and is very simple to integrate into several energy system to supply a maximum current or voltage.

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