There are three 5k ohm resistors in the IC which are connected in series between the VCC and GND pins and are used as the voltage dividers. It is called 555 because of its internal circuit. This is one of the most commonly asked questions.

I would appreciate your support in this way! I may make a commission if you buy the components through these links. Seriously, the 555 Timer is the most popular integrated circuit ever manufactured. Alone in 2003, it was estimated that 1 billion units were manufactured. Due to its high demand, the 555 timer ICs are now manufactured in many countries. The NE555 Timer IC is still used throughout the world due to its low price, easy use, and amazing stability. The 555 Timer IC was invented by Hans Camenzind and was first introduced in 1972 by Signetics. The 556 Timer IC has 2 timing circuits “Dual Timer”, while the 558 Timer IC has a total of 4 timing circuits “Quad Timer”. Two other packages of the Timer ICs are available which are 556 and 558. The 555 Timer IC is used to provide time delays, as an oscillator, and as a flip-flop element. The 555 Timer IC is an integrated chip used in a variety of timer, pulse generation, and oscillator applications. But, before I am going to explain different types of circuits that you can build with the 555 Timer IC, first, let’s start with the very basics of the 555 Timer IC. This article is fully dedicated to the 555 Timer IC, and I will try my level best to explain the maximum things and share with you some practical examples. You have no idea the things you can make with this small low-cost Timer IC. I have been using this timer IC for years in different electronics based projects, for generating pulses, delays, security systems, automation projects, etc. The 555 Timer IC is one of my favorite ICs.

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Automatic Street Light using 555 Timer and LDR:.

555 Timer Christmas lights Fireflies effect:.

555 Timer recommended values of Components:.

555 Timer with ON-OFF pulse “Variable duty cycle”:.

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IC 555 Pin Diagram / Description / configuration / Pinout:.

Download free 555 timer pinout