Knowing the three operational modes the 555 timer offers, it`s not hard to imagine its many applications in IC circuit designs: Oscillator: The 555 timer can be used as a simple clock pulse generator (up to 1 or 2 MHz) A monostable timer is a one-stable timer; that is, it returns to its original (stable) state (off) after a certain period of time. Monostable operation is characterized by the clothes iron,
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which switches itself off after being unattended for 10 minutes. Each time the iron is moved, a small sensor resets the timer to zero to begin another count. The iron remains on as long as it is moved within the 10-minute limit. The 555 timer chip uses two external components, a resistor (R1) and a capacitor (C1), which act together to form a circuit that times the monostable pulse. Changing the values of either or both of these components will change the electricity. Resistors are components that oppose the flow of current. By using a resistor in the circuit, the time it takes to charge or discharge a capacitor can be changed. By changing the time it takes for the capacitor to charge, you can change the timing duration of the output of the 555 timer chip. This can be done by replacing the capacitor with one of larger or smaller value or by replacing the resistor with one of larger or smaller value. An astable timer is one that is constantly pulsing, never staying in one state or the other. It is constantly switching between its two states. The flashing light or pulsing buzzer that warns that the seat belts are not fastened when you start a car is an example of astable operation. In this mode, the output pulse is fed back into the chip to trigger another pulse, and the result is a continuous pulsed signal. As shown in the schematic diagram, an astable timer can blink an LED. Other devices, such as a buzzer or a speaker, can...
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.....
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