#### 555 Timer Circuits and Projects – List of 25+ Simple and Advanced Circuits

john June 14, 2017 5 Comments
We are listing a curated collection of 555 Timer Circuits and Projects published in our site before. We have a large collection of simple and advanced projects using 555 Timer IC. In this article, we have handpicked some really...

#### 555 Timer-Ramp Generator

jojo February 28, 2010 3 Comments
Ramp Generator Circuit-using 555 Timer IC We know that if a capacitor is charged from a voltage source through a resistor, an exponential waveform is produced while charging of a capaci­tor from a constant current source produces a ramp....

#### 555 Timer Oscillator

jojo February 28, 2010 2 Comments
A voltage-controlled oscillator (VCO) using the timer 555 is shown in figure. The circuit is sometimes called a voltage-to-frequency converter because the output frequency can be changed by changing the input voltage. As discussed in previous blog posts, pin...

#### 555 Timer as Monostable Multivibrator

jojo January 23, 2018 38 Comments
Are you familiar with the basics and applications of the 555 timer IC? Are you looking for a book that provides all these basics? If so, CircuitsToday has started an online store from where you can buy books on...

#### Astable Multivibrator using 555 Timer IC

jojo June 20, 2017 27 Comments
In this article, we are explaining an astable multivibrator, often called a free-running multivibrator. An astable multivibrator can be designed using different types of components, say using transistors (and associated components) alone or by using op amps (and associated components)....

#### 555 Timer IC Working Principle

jojo February 25, 2014 11 Comments
Block Diagram of 555 timer IC:       Comparator 1 has a threshold input (pin 6) and a control input (pin 5). In most applications, the control input is not used, so that the control voltage equals...

#### 555 Timer IC Block Diagram

jojo April 7, 2011 No Comments
Block diagram for the 555 timer is given in figure. As shown in the block diagram, a 555 timer consists of two comparators (simply op-amps), an R-S flip-flop, two transistors and a resistive network Resistive network consists of...

#### 555 Timer IC Basics

jojo April 7, 2011 No Comments
The 555 timer combines a relaxation oscillator, two comparators, an R-S flip-flop, and a discharge capacitor.   R-S Flip-Flop. A pair of cross-coupled transistors is shown in figure. Each collector drives the opposite base through resistance RB. In such...