This circuit based project demonstrates the working of 555 timer in astable mode to generate pulses of time period 0. 5 second. This pulse can be further used for anything where we need a pulse such as to blink a LED or to create fashionable blinking lights. Image below shows internal circuitry of NE 555 timer which can be used in astable and monos
Click here to download the full size of the above Circuit.
table mode: This circuit of this project makes the use of timer IC NE555 which produces a constant square pulse of a desired frequency. This pulse could be either triggered or could be produced continuously depending upon the mode of 555 we are using. The two mostly used modes of 555 are Monostable and Astable. Here it is used in the astable mode with time period of half second, with high time period of 0. 333 seconds and low time period of 0. 166 seconds. For astable mode total time period is [ln2C*(R1+2*R2)] with high time period as [ln2(R1+R2)*C]and low time period as [ln2(R2*C)]. Here R1 is the resistor connected between VCC and pin7 (discharge pin), R2 is between pin7 and pin2 (trigger pin) and C1 is the capacitor connected from pin2 to ground. For 555 to function in astable mode pin2 and pin6 (threshold) pin must be shorted. Reset pin is connected to VCC. The output of 555 is taken at pin3 which is in the form of square wave and is then fed to lighting circuit which glows when output is high and stops when it becomes low; there by producing pattern of blinking lights. By varying the value of R1, R2 and C1 square waves of different time periods can be obtained.
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: