Thursday, February 28, 2013

Download E-Book Digital Systems Principles and Application 8th Edition by By Ronald J. Tocci, Neal S. Widmer

Robometricschool. - I think you must complete your reference in digital theory and application now with e-book Digital Systems Principles and Application 8th Edition by By Ronald J. Tocci, Neal S. Widmer

This e-book will show you more information about digital systems, principles, and also some application. With this book you can learn about Number Systems and Codes, Logic Gates and Boolean Algebra, Combinational Logic Circuits,  Flip-Flops and Related Devices,  Digital Arithmetic: Operations and Circuits, Counters and Registers, Integrated-Circuit Logic Families, MSI Logic Circuits, Interfacing with the Analog World, Memory Devices, Applications of a Programmable Logic Device.

The book Digital Systems Principles and Application 8th Edition also completed with several appendix likes, Introduction to the Microprocessor and the Microcomputer, Manufacturers' IC Data Sheets. In this book also completed with glossary and also answer of the problem that gived. 

So, if you want to get free download e-book Digital Systems Principles and Application 8th Edition you can click link below:

And if you want to get the real book Digital Systems Principles and Application 11th Edition, you can buy from online store. Here is link when you want to buy this book from online store.

Wednesday, February 27, 2013

Download C Source Code for Radio Frequency Identification RFID Module Interface MCS51

Robometricschool. - In this time we want to share with you about RFID module that very useful to RF project this day. IN our sharing, we want give you what is RFID, show you schematic diagram RFID module interface microcontroller MSC51 AT89S52, and give you download sample C source code for RFID module interface MCS51.

What is RFID?

Maybe there are many people that not know yet about RFID now. RFID stand for Radio Frequency Identification. RFID is a technology that serves to detect and identify an object through the data transmitted via radio frequency. The system requires a minimum of a tag (which serves as a transponder), a reader (who serves as interrogator), and sebuan antenna (which serves as a coupling device).

One important element in RFID is a data transfer. Data transfer occurs when there is connection between the tag and reader, known as coupling through either an antenna mounted on the tag or reader as illustrated in the following figure 1 below:

Figure 1. The relationship between the tag, reader and antenna

Schematic Diagram RFID Module Interface MCS51 AT89S52

Figure 2. RFID Mode Interface AT89S52 Schematic Diagram

Example C Source Code RFID Module Interface MCS51 AT89S52

//Test SL025x
//MCS51 source code
#include <reg52.h>
#include <string.h>

#define  true     1
#define  false    0

#define  OSC_FREQ        22118400L
#define  TIME0_10ms      65536L - OSC_FREQ/1200L

#define  BOUND4800       256 - 24
#define  BOUND9600       256 - 12
#define  BOUND14400      256 - 8
#define  BOUND19200      256 - 6
#define  BOUND28800      256 - 4
#define  BOUND38400      256 - 3
#define  BOUND57600      256 - 2
#define  BOUND115200     256 - 1

//IO definition
sbit     CARDIN    =    P1^0;                                                    

void InitializeSystem();                                                          
void SendCom(unsigned char *g_cCommand);                                          
void StartTime(unsigned int _MS);                                                 
void StopTime();
char ReadWriteUltralight(void);
char ReadWriteMifareStd(void);

//Command List, preamble + length + command code + data frame
unsigned char code SelectCard[3] =     {0xBA,0x02,0x01 };      
unsigned char code LoginSector0[11] =  {0xBA,0x0A,0x02,0x00,0xAA,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; 
unsigned char code LoginSector1[11] =  {0xBA,0x0A,0x02,0x01,0xAA,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
unsigned char code ReadBlock1[4]   =   {0xBA,0x03,0x03,0x01};                                    
unsigned char code WriteBlock1[20] =   {0xBA,0x13,0x04,0x01,0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0xAA,0xBB,0xCC,0xDD,0xEE,0xFF};                               
unsigned char code ReadValue[4]  =     {0xBA,0x03,0x05,0x05}; 
unsigned char code InitializeValue[8] ={0xBA,0x07,0x06,0x04,0x00,0x00,0x00,0x01};                               
unsigned char code IncrementValue[8] = {0xBA,0x07,0x08,0x04,0x00,0x00,0x00,0x20};                               
unsigned char code DecrementValue[8] = {0xBA,0x07,0x09,0x04,0x03,0x00,0x00,0x00};                                         
unsigned char code CopyValue[5] =      {0xBA,0x04,0x0A,0x04,0x05};
unsigned char code ReadULPage5[4] =    {0xBA,0x03,0x10,0x05};                                         
unsigned char code WriteULPage5[8] =   {0xBA,0x07,0x11,0x05,0x11,0x22,0x33,0x44};
unsigned char code TurnOnRedLed[4] =   {0xBA,0x03,0x40,0x01};    
unsigned char code TurnOffRedLed[4] =  {0xBA,0x03,0x40,0x00};            
unsigned char g_ucReceBuf[21];                                     
unsigned char g_ucReceNum;                                         
unsigned char g_ucWatchTime;
unsigned char g_ucCardType;
char g_cStatus;                                      
char g_cErr;

bit   g_bReceOver;                                                
bit   g_bReceReady;
bit   g_bTimeOut;        
For more complete example C source for RFID Module Interface MCS51 AT89S52, please you take free download with click link below:

Tuesday, February 26, 2013

Lets Design Line Sensor for Line Follower Robot

Robometricschool. - In this time we want to share with you about how to design line sensor that be usually used in Line Follower Robot. We want to design line sensor using main component IR LED and Photo-Diode. Beside using LED IR and Photodiode, you also can design line sensor using Photo-reflector.
Figure 1. Line Sensor when not get infra red light

As we know that line sensor can be used as line sensor in line follower robot. Infra Red LED or called IR LED will transmitte infra red signal to photodiode. IR LED will transmitte infra led when any current that flow to this component. This work like DIODE, but specially to transmitte infra red light not visible light.

Figure 2. Line Sensor when get infra red light
Other component is photodiode as reciever of infra red signal that transmitted by IR LED. Photodiode is a type of light-sensitive sensor (photodetector). Photodiode current will flow which forms a linear function of the intensity of the light received. These currents are generally organized on power density (Dp). Comparison between the output current with a power called the current density responsitivity. Flows in question is the leakage current when the photodiode is exposed and in forward biases.

Here is the relationship between the photodiode output light intensity received when get forward biases is forming a linear function like in figure 2 below:

Figure 2. Photodiode output relationship with the intensity of light

Line Sensor Working Mechanism

You can see mechanism of line sensor principle when it sensor detect line in the floor like in figure 3 below:

Figure 3. Line Sensor Working Mechanism

Work Priciple of Line Sensor 

We will divide work principle of line sensor into two part there are when sensor get infra red light and when sensor not get infra red light.

  • When sensor not get infra red light
When photodiode not get infra red light, it will make the resistance value can be assumed to be large or infinite. So there is no leakage current that flows into the comparator like in figure 1. above.

  • When sensor get infra red light

When photodiode not get infra red light,the photodiode will be a source of voltage and resistance value will be small, so there will be leakage current flowing to the comparator like in figure 2. above. 

Monday, February 25, 2013

Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F

Robometricschool. - One of the sensor or detector that very useful in security electronic system is moving sensor detector. With this sensor we can sense something that usually move in our field as like human, animals and others. So we can detected this movement and we can do something if it will dangerous in our live.

In here we will give you simple electronic circuit schematic moving sensor / detector using IC NE555 and Phototransistor L14F as like in Figure 1 below:

Electronic Schematic Diagram

Figure 1. Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F

Component List

You can see more all components that used in Moving Sensor / Detector Schematic Diagram using IC NE555 and Phototransistor L14F. Main component in this circuit is IC NE555, Led IR, Phototransistor L14F and IC LM1458.
Schematic Performance

Moving sensor / detector schematic diagram divided into two parts, there are transmitter and receiver. Transmitter part is the part that will send infra red data using IC NE555 and LED infra red. And in receiver part using photo-transistor L14F that will receive IR signal from LED IR in transmitter. Signal from photo-transistor will allowed through to IC LM1458 as signal conditioner. 

IC1 (NE 555) is an astable multivibrator which connect with IR LEDs produce infrared rays 5Khz. infrared rays will be received by the photo transistor Q1, if under normal conditions the output pin (7) of IC2 will be low (low). and if you are moving objects between the transmitter and the receiver on pin 7 of the IC 2 will be conditioned (high). bazzer bell circuit or can be connected to the output of IC 2 is to demonstrate the existence of this disorder. As note that POT R5 can be used for sensitivity adjustment  

Sunday, February 24, 2013

6 Kinds of Software that Used in Human Machine Interface (HMI)

Robometricschool. - Several days ago, we discussed about SCADA system that very popular in industry this day, this time i will continue to give you information about kinds of software that used in HMI (Human Machine Interface). Do you know before about What is Human Machine Interface (HMI)

Figure 1. HMI Illustration

HMI (Human Machine Interface) is the mediation between machines and humans. HMI serves as a medium to control, operate and analyzing machines are operated using a PLC. Currently, many products for this application. Below I will explain the various types of HMI few frequently used in industrial applications.

In here we will show you 6 kinds of software that usually used in HMI application. The software that usually used in HMI as follows:
  1. Wonderware Intouch
  2. WinCC Flexible from Siemens.
  3. I-FIX from GE Fanuc
  4. CX Supervisor from Omron
  5. RSView from Allen Bradley
  6. Citect that can you check from this site
Beside 6 kinds of software that usually used in HMI application, there are still many other software that used in HMI application. As note there very difficulty to get free download all software. I think you must buy this software when you want to applied this software. Like there are many question how to get free download software wonderware intouch, but it very difficulty to get it. So if you have this software you can share to get free download software wonderware intouch. It maybe will useful for other people.

Friday, February 22, 2013

Let Study about Supervisory Control And Data Acquisition (SCADA) System

Robometricschool. In this time we want to discuss about SCADA system this this time very popular in industry. In this discussion we will show you about What is SCADA system?, Components in SCADA Systems, and Type of System Configuration.

Figure 1. SCADA System Illustration

What is SCADA system?

Before we continue more our discussion about SCADA system, firstly we will know you what is SCADA system. 
SCADA is stand for Supervisory Control and Data Acquisition. It is mean that SCADA is combination system between telemetry and data acquisition. The system consists of retrieval of information, transfer of captured data to the control center, control and decision analysis, and then the appearance of data in multiple monitors. SCADA systems are used to monitor and control the cutting edge equipment in the industry.

In here telemetry define as techniques that used to transmit and receive information or data through an intermediary. The information can be processed measurements such as voltage, speed and flow. These data are sent to other locations through the mediation of the cable, telephone or radio. The information can be sent from multiple locations with the integrated way through the system.

Beside telemetry, SCADA also consist of data acquisition, data acquisition define as methods that used to access and control information or data from the equipment to be controlled or monitored. Data are accessed and then passed to the telemetry system and ready to send to a different location. The data can include information in digital or analog form collected by sensors such as flow-meter, ammeter and others. He can also be data to control devices such as actuators, relays, valves, motors and others.

Beside SCADA we also find other terms, this terms is DCS. What is DCS and difference with SCADA system? in here DCS stand for Distributed Control Systems. DCS also used in industry and placed in good and closed place. DCS using the communication medium with high speed, such as local area network (LAN) and there are a number of closed-loop control of the system.

DCS will deference with SCADA because SCADA covers the system with a larger area, and have some tissues such as radio and telephone communications and closed loop control is not very important in this system.

Components that used in SCADA System

When we tell about SCADA, this system has more than 4 components that used. The components are usually used in SCADA system likes filed instrumentation, remote stations, communication networks, central monitoring station.
Figure 2. Components of  SCADA System

  1. Filed Instrumentation is a component that usually a sensor or actuator that is connected directly to the equipment. He produces analog and digital signals are monitored at the remote stations. Signal also conditioned to assure the compatibility between the input and output on the Remote Terminal Units (RTUs) or Programmable Logic Controller (PLC) on the Remote Station.
  2. Remote Station is a component that installed on the remote plant or equipment monitored or controlled by the central host computer. It can be a Remote Terminal Units (RTUs) or Programmable Logic Controller (PLC).
  3. Communication Networks is component that used as intermediaries to transfer information from one location to another. Can be a telephone, radio or cable.
  4. Central Monitoring Station (CMS) is the location of the master or the host computer. He may consist of several control center using Man Machine Interface (MMI) program to monitor certain types of data needed for the operation.

Types of System Configuration

To complete you knowledge in SCADA system, in here we will give you about types of system configuration. There are two types of system configuration that usually used in SCADA system.

Figure 3. Point to Point Configuration
Figure 4. Point to Multipoint Configuration
  1. Point to Point Configuration. This configuration is the telemetry configuration system that very simple. The data here are exchanged through two stations. The station is used as master and the other as the slave. An example is the two RTU setup: one for the reservoir or tank and other water pumps at different locations. By the time the tank is nearly empty, the tank RTU will send EMPTY RTU command to another and when the tank is full, tank FULL at the RTU will send a command to the RTU pump to stop the motor. Please see figure 3 above. 
  2. Point to Multipoint Configuration. This configuration used if the equipment is used as a master unit for multiple slave units. Master is usually the primary host and placed the control room and the remote slave units in the field. Each slave has a unique address or ID number. See figure 4 above.

Wednesday, February 20, 2013

Downloader PIC Microcontroller (PIC Multi Programmer) Schematic

Robometricschool. - To complete your PIC microcontroller project, i here we will give you downloader PIC microcontroller (PIC multi programmer) that you can use to download or insert your PIC program to PIC microcontroller easily.

With device of downloader PIC microcontroller you can take experiment and programmed many types of PIC microcontroller and than with downloader PIC microcontroller schematic you ca make it by your self easily only with single layer PCB and also can get easily that used in this schematic.

Figure 1. Downloader PIC Microcontroller (PIC Multi Programmer) Schematic

I hope with Downloader PIC Microcontroller (PIC Multi Programmer) Schematic you can make more project using PIC microcontroller. 

Introducing PIC Microcontroller : History, Application, and Series of PIC Microcontroller

Robometricschool. - One again microcontroller that very popular in industry application is PIC microcontroller. Some of experience said that using PIC microcontroller will get good stable for controlled DC motor and others. So, many people like use PIC microcontroller because this reason.
Figure 1. Chip PIC16C57

In this time will discuss about introduction PIC microcotroller  that you can use as guidance when you want tolearn more PIC microcotroller. Here are global information that you can know about PIC microcontroller.
Figure 2. Figure of PIC16F84A

PIC microcontrollers ( Programmable Interface Controllers), are electronic circuits that can be programmed to carry out a vast range of tasks. They can be programmed to be timers or to control a production line and much more. They are found in most electronic devices such as alarm systems, computer control systems, phones, in fact almost any electronic device. Many types of PIC microcontrollers exist, although the best are probably found in the GENIE range of programmable microcontrollers. These are programmed and simulated by Circuit Wizard software.

Figure 3. Figure of PIC18F87J72 Microchip

According the history of PIC microcontroller that The PIC microcontroller was developed by General Instruments in 1975. PIC was developed when Microelectronics Division of General Instruments was testing its 16-bit CPU CP1600. Although the CP1600 was a good CPU but it had low I/O performance. The PIC controller was used to offload the I/O the tasks from CPU to improve the overall performance of the system.

And than In 1985, General Instruments converted their Microelectronics Division to Microchip Technology. PIC stands for Peripheral Interface Controller. The General Instruments used the acronyms Programmable Interface Controller and Programmable Intelligent Computer for the initial PICs (PIC1640 and PIC1650).

And the next that in the year 1993, Microchip Technology launched the 8-bit PIC16C84 with EEPROM which could be programmed using serial programming method. The improved version of PIC16C84 with flash memory (PIC18F84 and PIC18F84A) and then it hit the market in 1998. 

When we tell about application of PIC microcontroller we can find many tools that design with PIC microcotroller as like for laboratory tools. There many application PIC microcontroller for laboratory tools likes for measuring instrument enumerator number of turns the motor using PIC16F84, temperature measuring devices using PIC16F877A with thermocouple sensors, DC motor speed measuring devices using the PIC16F877, etc.

Figure 4. Pin of PIC16F8X and PIC16CR8X

There are also many series of PIC Microcontroller likes :

  • PIC12C508,PIC12C5
  • PIC12C508A,PIC12C509A
  • PIC12CE518,PIC12CE519
  • PIC12C671,PIC12C672,PIC12CE673,PIC12CE674
  • PIC12F508,PIC12F509
  • PIC12F629,PIC12F635(1)(2),PIC12F675,PIC12F683(2)
  • PIC16C5051
  • 16C62B(3),
  • PIC16F627,PIC16F628
  • PIC16F627A(2),PIC16F628A,PIC16F648A
  • PIC16F630,PIC16F636(2),PIC16F676,PIC16F684(2),PIC16F688(2)
  • PIC16C711(3), PIC16C716
  • PIC16C745(3),PIC16C765(3)
  • PIC16C771(7)
  • PIC16C773,PIC16C774
  • PIC16C781(7)
  • PIC16F870(8),PIC16F871(8),PIC16F872,PIC16F873,PIC16F874(4),PIC16F876(5),PIC16F877(5)
  • and still many others again.

Tuesday, February 19, 2013

Electronic Schematic Automatic Lead Acid Battery Charger using NE555 and Transistor PNP 2SA671

Robometricschool. - One again electronic circuit that you can use to charge your lead acid battery is automatic lead acid battery Charger using NE555 and Transistor PNP 2SA671. I think this circuit schematic will very useful toyou when you need charge your battery automatically. That mean when your battery fully charge it will finish to charge automatically. It will make your battery always durable and long lasting to use.

Automatic Lead Acid Battery Charger using NE555 and Transistor PNP 2SA671 schematic is electronic circuit schematic that serves to fill the battery automatically. This series will provide the charging current to the battery constantly, then after fully charge the full voltage detection circuit will cut off the charging current automatically.

Electronic Schematic Circuit

Figure 1. Automatic Lead Acid Battery Charger using NE555 and Transistor PNP 2SA671 Schematic

Component List:

For more component list information you can see directly from electronic circuit schematic of  Automatic Lead Acid Battery Charger using NE555 and Transistor PNP 2SA671  above. You can find easily all component in electronic market. 

But when we say about very urgent of the component above are IC NE555 and also transistor PNP 2SA671 that to be heart of this schematic. But it is also easy to find in electronic market this day.

Schematic Performances:

Automatic Lead Acid Battery Charger using NE555 and Transistor PNP 2SA671 schematic like in figure 1 above is used to fill or charge the lead acid battery automatically. Main component in this schematic is NE555 and also transistor PNP 2SA671.

Using internal comparator IC NE555, this schematic can automatically switch off the voltage, when lead acid battery fully charge. To cut the voltage, this schematic using relay RY1. This schematic can be used for charge lead acid battery with 6V or 12V according reference voltage setting that choosing. This schematic also completed with starter switch S1 to start charge or fill process.

Automatic Lead Acid Battery Charger using NE555 and Transistor PNP 2SA671 schematic using transistor 2SA671 as power charger and also using R 27ohm as current limiter. Voltage reference as indicator for fully charge adjusted using two variable resistor 22K and also switch selector to select voltage that chosen. 

You can change transistor 2SA671 with similar transistor that has high power to get good power and high lever voltage to charge. (her) 

Sunday, February 17, 2013

Download E-Book Getting Started with the CodeVisionAVR C Compile

Robometricschool. - In this time we want to share with you about e book that you can use as guidance to start with codevision AVR with C compiler for AVR microcontroller. This e-book is titled with Getting Started with the CodeVisionAVR C Compiler. And than you can get free download this e-book from this blog.

When you learn about e-book Getting Started with the CodeVisionAVR C Compiler, you can get some information about several knowledge as likes:

  • Installing and Configuring CodeVisionAVR to Work with the Atmel STK®500 Starter Kit and AVR Studio® Debugger.
  • Creating a New Project Using the CodeWizardAVR Automatic Program Generator.
  • Editing and Compiling the C Code.
  • Loading the Executable Code into the Target Microcontroller on the STK500 Starter Kit.

According introducing of this e-book that the purpose of this application note is to guide the user through the preparation of an example C program using the CodeVisionAVR C Compiler. The example, which is the subject of this application note, is a simple program for the Atmel ATmega8515 microcontroller on the STK500 starter kit.

So with the e-book Getting Started with the CodeVisionAVR C Compiler you can learn step-by-step and implemented in your AVR project. Please download this e-book by click link bellow:

Hope this e-book will hep you to start and finish your programming using microcontroler AVR that very popular this day. (her) 

Saturday, February 16, 2013

Minirobot VelociRoACH that can Running Fastest plus Video

Robometricschool. - When we tell about robot technology, so robot technology has developed with very faster. One again robot technology that developed is minirobot VelociRoaACH that can running fastest in the world. 

Figure 1. Minirobot  VelociRoACH that can Running Fastest

Minirobot VelociRoaACH is mini robot that designed like cockroach that can run very fast from one place to other place. This robot designed like cockroach because insect is a perfect miniature for a legged robot. Its speed is capable to 2.7 meters per second, making this robot as one of the fastest for its size robot. Even compared to native cockroaches, robots also have the ability to run faster.

Although before has developed also robot like cockroach that named Roachbot, but this robot has ability to run very fast. Maybe we will say why Minirobot VelociRoaACH can run very fast? The key to the speed of the robot is located on a six-foot-shaped like the letter C which is capable of rotating rapidly. Even the robot leg is able to stomp his feet to the ground 15 times per second.

Beside can run very fast, VelociRoaACH robot also can keep stability. Foot robot programmed until there are three legs to the ground at the same track. Moreover, if the robot has a barrier in front of it, the robot will use his head to get rid of these barriers. Although this robot light more than 30 grams, but this robot can bring weight load more than 120 gram. So this robot very interesting for their technology. 

To know more action Minirobot VelociRoACH that can Running Fastest, you can watch the video of this robot. Please click link video below:

Friday, February 15, 2013

Free Download E-Book MCS-51 Instruction Set Microcontroller

Robometricschool. - To complete your collection MCS-51 microcontroller programming , in here we want give you e-book MCS-51 instruction set that you can use as guidance when you you do programming assembly in MCS-51 microcontroller like when you want to programming AT89S51/52 microcontroller in your project.

Figure 1. MCS-51 Instruction Set Microcontroller Illustration

For review, we can make program MCS-51 microcontroller using assembly language as machines language or use high level language like Baskom or C, C++. When you program microcontroller using assembly language you need guidance set instruction that you can use to transform your logical to microcontroller language. So it is very important when you program microcontroller using assembly language you know instruction set that used. It will guidance you to make true program in microcontroller.

You can write this assembly microcontroller language using software MIDE-51  or also you can write it in wordpad or notepad. In our experience we will enjoy to write assembly language for MCS-51 microcontroller using MIDE-51, it because beside we can write MCS-51 instruction set in here, we also can  check our program that is true or false and the next we also can compile our program to .HEX file. So it is very easy. If you interesting to use MIDE-51 you can get it free MIDE-51 free Download

And continue to instruction set for MCS-51 you clearly need if you want program your MCS-51 microcontroller using assembly language, So you can know more MCS-51 set instruction by take free download E-book MCS-51 Set Instruction microcontroller by click link below:

Thursday, February 14, 2013

12 VDC Transformerless Power Supply Circuit Schematic

Robometricschool. - There are many power supply schematic that designed without using transformer to transform voltage from input to output. Without transformer power supply schematic to be simple and also more slight. In this moment robometricschool blog will give you one of the power supply schematic that not using transformer.

We call this schematic with 12 VDC Transformerless Power Supply Circuit Schematic. You can realize this schematic in to real form power supply with low cost and also can help you to supply your electronic device at home.

12 VDC Transformerless Power Supply Schematic

Figure 1. 12 VDC Transformerless Power Supply Schematic

Component List:

When we note the 12 VDC transformerless power supply schematic like in figure 1 above, transformer component changed with resistor, capasitor, and also zener diode. You must note all value of these components. 
For more components needed, you can see in figure 1 above.

Schematic Performance 

We will describe the performance of 12 VDC transformerless power supply schematic above as follow:
  • To get 12 VDC in output this schematic is used zener diode ZD3 12V. With this component dc voltage from R2 100 ohm will be regulated to be 12 VDC.  
  • C2 47 uF is used to stable the output DC voltage from bridge diode BR1
  • As substitute of transformer, are used components as like resistor FR, R1 with high power, capacitor C1 with high voltage more than 400 volt, and also zener diode ZD1 and ZD2 to get 16 volt AC. All components connected series one to other like in schematic. 
  • Capacitor C1 although connected series it can flow AC voltage to zener diode. It like the characteristic of this capacitor component that will allow AC current and blocked DC current.

Wednesday, February 13, 2013

Symmetric Power Supply +15V, 0, -15V Electronic Schematic Circuit

Robometricschool. - Still with section power supply, before we have been sharing with you more about schematic of asymmetric power supply that you can use to supply your asymmetric electronic devices.

Before we discuss about symmetric power supply, firstly we want to give you know about differences without asymmetric and symmetric power supply to make you more understand and not again confuse with this terms. And the next you can implement this terms in electronic fields as well.

Asymmetric power supply is power supply that designed with single polarity output like positive polarity for examples: +12V, +15V, +18V, etc or also like negative polarity for examples: -12V, -15V, -18V, etc. Usually asymmetric power supply has two pins output these are positive or negative outputs and ground.

And Symmetric power supply is power supply that designed with double polarities output negative and positive that has same values. For example there are power supply with output +5V, 0, -5V. From the example we know that symmetric power supply has output voltages these are +5V, -5V, and also ground (0). In design symmetric power supply has center tab (CT) as ground level.

In this moment we will give you one of the design symmetric power supply +15V, 0, -15V electronic circuit that you can use to supply your symmetric electronic devices like OCL power amplifier. You can see the schematic electronic of this power supply in figure 1 below.

Schematic of Symmetric Power Supply +15, 0, -15V

Figure 1. Schematic of Symmetric Power Supply +15, 0, -15V

Components list

To know more component list of Symmetric Power Supply +15, 0, -15V, you can see from the figure 1 above.
From the schematic, you must need IC1 7815 and IC2 7915 to get symmetric voltage +15V and -15V. In here you also can change IC1 and IC2 with other value to get different output voltage from this electronic schematic circuit.  

Circuit Performance   

From the figure 1, that show us about Schematic of Symmetric Power Supply +15, 0, -15V, we can divide three parts that we can describe all the performances. The three parts are transformer, rectifier, and regulator. Here are functions of all parts:

  1. Step-Down section, this section serves to lower the voltage of AC 220 volt to 18 volt AC voltage. The components used are step-down transformers 1 A with output voltages of 18 volts with CT.
  2. Rectifier section, this section serves to rectify the AC voltage 18 volt DC voltage becoming + 18 volts and -18 volts. The components that are used as a rectifier is a series of 4 pieces of 1N4001 diode bridge strung and 2 electrolytic capacitor (elco) 2200uF/35V. 
  3. Regulator section, this section serves to determine the power supply output voltage is symmetrical to have + 15 volts DC and -15 volts DC stable. The components that are used as a voltage regulator is + 15 volt DC voltage regulator IC LM7815 and - 15 volts DC using LM7915 regulator IC type.

As added from Schematic of Symmetric Power Supply +15, 0, -15V above you can use it to supply symmetric parametric Equalizer and others.