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INFRARED TRANSMITTER USING 555 Timer Here i am going to explain INFRARED TRANSMITTER USING 555 Timer. I think you already know the applications of INFRARED RAYS, we can't see them directly with our eyes. The timer NE555 is used here as an ASTABLE MULTIVIBRATOR , which will generate non sinusoidal (square) output waves. The 555 timer is the core part of this circuit. The output from pin3 is given directly to the IR LED with the help of current limiting Resistor. IR LED looks almost similar to an ordinary LED. And it is cheap. FREQUENCY DETERMINATION OF INFRARED TRANSMITTER CIRCUIT The frequency of this circuit is determined by the value of Resistors R1, R2 and the capacitor C. For normal purposes the IR frequency is about 38Khz. To generate an INFRARED ray with frequency 38khz you have to select the values of R1, R2, and C as follows. R1- 150K R2- 1.5K C- 0.01μF You can use our ASTABLE MULTIVIBRATOR Frequency Calculator tool to determine the value of R1, R2 and C CIRCUIT DIAGRAM OF...

This is the Simple 5V POWER SUPPLY USING 7805 IC FROM 230V AC MAINS circuit Diagram.Almost all digital circuits are works under 5V power supply. Here we are going to discuss on How to Generate  5V from 230V A.C supply. Digital IC’s, Microcontrollers, MicroProcessors and some basic circuits are generally powered by a 5V DC voltage. By using this project, you can eliminate the need of a battery in common circuitries. The circuit is simple to construct and maintain as it includes the following parts:- COMPONENTS USED Transformer  9V/2A  1 Regulator IC  7805  1 Diodes   1N4007  4 Capacitor   470uF,50V 1            0.01uF  2 Simple 5V POWER SUPPLY USING 7805 IC FROM 230V AC MAINS Working Principle of 5V Voltage Source The circuit consisting of a 9V stepdown transformer, voltage regulator IC(7805) and some capacitors, used for filtering purpose. The figure given below shows the basic block...