Author - Ligo George

ULN2003

ULN2003 High Voltage and High Current Darlington Transistor Array

ULN2003 The ULN2003 is a monolithic IC consists of seven NPN darlington transistor pairs with high voltage and current capability. It is commonly used for applications such as relay drivers, motor, display drivers, led lamp drivers, logic buffers, line drivers, hammer drivers and other high voltage current applications. It consists of common cathode clamp diodes for each NPN darlington pair which makes this driver IC useful for switching inductive loads. Schematic Diagram of each Darlington Pair - ULN2003 The output of the driver...

February 24, 2013By Electronics, IC, 12 CommentsRead more...
dc motor

DC Motor Speed Control using PWM with PIC Microcontroller

I already posted about Interfacing DC Motor with PIC Microcontroller. In our robotics applications we may have to control the speed of the DC Motor. In this tutorial we will see how to control the speed of a DC Motor using Pulse Width Modulation (PWM). By using PWM we can easily control the average power delivered to a load and by thus we can easily control the speed of the DC Motor. You may think that a variable resistor in series...

January 26, 2013By MikroC, PIC Microcontroller, Tutorials, , , 143 CommentsRead more...
PIC16F877A

Generating PWM with PIC Microcontroller using CCP Module

PWM is a technique used to generate analog output signal using digital signals. It is commonly used to control average power delivered to a load, motor speed control, generating analog voltage levels and for generating analog waveforms. CCP Modules are available with a number of PIC Microcontrollers. CCP stands for Capture/Compare/PWM. Using PWM module is far more easier and cost effective than using extra chips for PWM generation.  MikroC Pro for PIC Microcontroller provide built-in library for PWM which makes our...

January 19, 2013By MikroC, PIC Microcontroller, Tutorials, , , , 114 CommentsRead more...

Expanding IO Ports of PIC Microcontroller using MCP23S17

Usually a microcontroller comes with a limited number of IO ports called General Purpose Input Output (GPIO) ports. But some applications require more IO ports than that available on a microcontroller. In these cases we can use IO Port Expanders to increase the IO capability of a microcontroller. MCP23017 and MCP23S17 are two such 16 bit IO expander with Serial Interface  manufactured by Microchip. MCP23017 uses high speed I2C interface while MCP23S17 used high speed SPI interface. MCP23S17 In this tutorial we...

January 13, 2013By MikroC, PIC Microcontroller, Tutorials, , , 4 CommentsRead more...
X Rated Capacitor

TransformerLess Low Cost DC Power Supply : Resistive & Capacitive

One on the major part of our electronics products is the DC Power Supply that converts mains AC voltage to a lower DC voltage. Usually we use a step down transformer to reduce mains AC voltage to desired low voltage AC and then convert it to DC or we use Switched Mode Power Supplies. But in both cases cost is very high and it takes considerable amount of space. Another Low Cost alternative for Transformer and Switcher based power supply...

December 24, 2012By Electronics, Hobby Circuits, Power Supply69 CommentsRead more...
Zener Diode

Zener Diode Voltage Regulator

Zener Diode is a general purpose diode, which behaves like a normal diode when forward biased. But when it is reverse biased above a certain voltage known as  zener breakdown voltage or zener voltage or avalanche point or zener knee voltage the voltage remains constant for a wide range of current. Clarence Zener is the scientist who discovered this electrical property and the device is named after him. Zener Diode Ordinary diodes will not have any significant current (only leakage current ) when reverse biased below...

December 14, 2012By Basic Electronics, Electronics, , 4 CommentsRead more...
X and Y rated Capacitors

X and Y Rated Capacitors

Capacitors are passive two terminal electronic components that has a wide variety of applications from oscillators to power supply applications. One of the important application of capacitors is power line filtering which is used in many electronic devices and appliances. Capacitors used for these applications are categorized as X and Y rated capacitors. These capacitors are also known as EMI/RFI suppression capacitors or AC Line filter safety capacitors. These capacitors can supply various protective measures and operational insulation to various electrical and electronics equipment. X...

December 12, 2012By Electronics1 CommentRead more...

CD4017 Decade Counter with 10 Decoded Outputs

The CD4017 is the one of the most popular Decade Counter (Divided by 10 Counter). It is a 5 Stage Divide by 10 Johnson Counter with 10 Decoded outputs. It has a wide supply voltage range from 3V to 15V and is compatible with TTL. It has a medium speed of operation, typically 5Mhz. Its applications includes industrial electronics, remote metering, automotive, medical electronics, instrumentation and alarm systems. CD4017 Pin Diagram CD4017 Pin Diagram The above diagram shows the pin out of CD4017B,...

December 8, 2012By Electronics, IC2 CommentsRead more...
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