TSOP1738 – Receiver for IR Remote Control Systems

TSOP1738 TSOP17XX is a commonly used IR receiver for Infrared PCM remote control systems. It is used in TVs, DVD Players, Burglar Alarms etc. This component is built with PIN Diode, Preamplifier and internal filter for PCM (Pulse Code Modulation) frequency and its epoxy package is designed as an IR filter. These are available with different carrier frequencies out of which TSOP1738 is very common whose carrier frequency is 38KHz. The output of TSOP17XX receivers can be directly connected to...

May 31, 2013By Ligo GeorgeElectronics, ICTSOP17383 CommentsRead more...

FM Generation using 555 Timer

In communication systems, Frequency Modulation (FM) is the process in which information (message signal) is transmitted over a carrier wave by varying its instantaneous frequency. The difference between instantaneous frequency and central frequency of the carrier will be directly proportional to the instantaneous value of the amplitude of message signal. 555 Timer wired in Astable Mode can be used for generating Frequency Modulated (FM) waves. Please read the article Astable Multivibrator using 555 Timer for more...

May 20, 2013By Ligo George555 Circuits, Electronics555, FM27 CommentsRead more...

Dancing Light using 555 Timer

A dancing light can be easily constructed using a 555 timer wired in astable mode. Please read the article Astable Multivibrator using 555 Timer before continuing. This circuit blinks two LEDs alternatively with some delay and it can be easily modified to include more LEDs or for controlling incandescent lamps. Time period of oscillation is determined by RC time constant of the circuit.

Circuit Diagram

Dancing Light using 555 Timer - Circuit Diagram 1st and 8th pins of 555 timer are used to provide power, Vcc...

May 18, 2013By Ligo George555 Circuits, Electronics, Hobby Circuits, Projects5550 CommentsRead more...

Monostable Multivibrator using 555 Timer

Monostable Multivibrator is also known as One Short Multivibrator. As its name indicates it has one stable state and it switches to unstable state for a predetermined time period T when it is triggered. The time period T is determined by the RC time constant in the circuit. Monostable mode of 555 Timer is commonly used for generating Pulse Width Modulated (PWM) waves.

Circuit Diagram

Monostable Multivibrator using 555 Timer - Circuit Diagram This is the circuit diagram of 555 Timer wired in...

May 16, 2013By Ligo George555 Circuits, Electronics5551 CommentRead more...

Generating PWM Using 555 Timer IC

In applications like Motor Speed Control, LED Brightness Control we may want to vary voltage given to it. Most often we use a variable resistor for that. The main problem with this control is the power dissipation across the variable resistor. This problem can be avoided by using Pulse Width Modulation (PWM). In this method the average voltage delivered to the load is controlled by varying the duty cycle of the rectangular wave. Here I'm going to discuss one of the simple technique to generate...

May 15, 2013By Manoj Shenoy555 Circuits, Electronics5554 CommentsRead more...

Variable Power Supply using LM317 Voltage Regulator

Until now we had discussed about different voltage regulator IC's including 7805,723 etc but what's to be noted was that these were all fixed voltage regulators.So now we shall see how design a simple variable voltage regulator using an LM317 IC.

Block Diagram

This circuit, like all voltage regulators must follow the same general block diagram Block Diagram of Power Supply Here, we have got an input high voltage AC going into a transformer which usually steps down the high voltage AC from...

May 11, 2013By Karthik NarayananElectronics, Power SupplyLM31731 CommentsRead more...

Paper Battery – The Future Power Source

Do you feel that the batteries we use now are bulky?? Here comes the solution for the problem of bulkiness.

The Paper Battery

Paper Battery A paper battery is an energy source which is more flexible and thin. This device is a combination of carbon nanotubes with cellulose based paper. The paper battery can act in two ways. A battery as well as a super capacitor. These non-toxic, flexible batteries can be used as a power source to next generation electronic...

May 7, 2013By Biswas HPower SupplyBattery0 CommentsRead more...

Using Push Button Switch with 8051 and Keil C – AT89C51

This tutorial is for beginners in the field of microcontroller. In this case the microcontroller is AT89C51, a reprogrammable derivative of 8051. This purpose of this tutorial is to familiarize with the use of push button switch with the microcontroller. It will be useful whenever a decision is to be made according to the press of a switch. If you are not yet started with 8051 with Keil C please refer this tutorial Blinking Led...

May 6, 2013By Febin Mathew8051 Microcontroller, Electronics, Tutorials8051, 8051 Microcontroller, AT89C51, Keil, Keil C, Microcontroller33 CommentsRead more...