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...
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555 Timer IC Pin configuration

jojo April 7, 2011 No Comments
The 555 Timer IC is available as an 8-pin metal can, an 8-pin mini DIP (dual-in-package) or a 14-pin DIP. This IC consists of 23 transistors, 2 diodes and 16 resistors. The explanation of terminals coming out of the...
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555 Timer – A Complete Basic Guide

jojo August 28, 2018 43 Comments
555 Timer IC-Block Diagram, Working, Pin Out Configuration, Data Sheet – A complete basic tutorial This article covers every basic aspect of 555 Timer IC. You may already know that SE/NE 555 is a Timer IC introduced by Signetics...
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Ding-Dong sound generator

john April 7, 2010 12 Comments
Description. This is the circuit diagram of a ding dong sound generator based on two NE555 timer ICs.The circuit is designed to toggle between two adjustable frequencies to produce the ding dong sound. The first NE555 (IC1) is wires...
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Infrared intrusion barrier

john February 28, 2010 22 Comments
Description. Here is the circuit diagram of an infrared intrusion detector. Whenever a trespasser cuts the invisible infrared beam an alarm sound will be raised. The arrangement consists of a receiver circuit and a transmitter circuit. The transmitter circuit...
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LED ramping circuit.

john February 28, 2010 6 Comments
Description. In this circuit the intensity of LED will vary in a ramping fashion. The circuit consists of three ICs: Two 555 timer ICs and one LM393 op-amp. IC1 and IC2 are wired as oscillators to produce 10 KHz...
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Battery operated mini night lamp

john February 28, 2010 13 Comments
Description. This is the circuit of a low power LED night lamp that will automatically switch OFF at day time. The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz.The output voltage from...
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4W Fluorescent lamp driver.

john February 28, 2010 17 Comments
Description. This is a simple 4 W fluorescent lamp driver circuit that can be operated from a 12 V supply.The first part of the circuit includes a NE555 timer IC wired as an astable multivibrator.The output pulses from the...
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Selective timer alarm.

john February 28, 2010 No Comments
Description. A timer circuit using IC 4060 is given here. The IC 4060 is a 14 stage binary counter with a built-in oscillator.R2, R7, C1 are the components that determine the frequency of the oscillator and the outputs will...
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Electronic toss circuit

jacky February 28, 2010 22 Comments
Description. The circuit given here can be used for tossing head or tail. There are many games in which a tossing is required to start and this circuit can be used in all such instances. The circuit uses two...
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