Welcome to the 555 Timer Circuits Website


Projects

All these projects can be built using LEDs,
and will all run off a small 9V battery.

Traffic Lights

Traffic Lights

Electronic Dice

Electronic Dice

Knight Rider Lights

Knight Rider Lights

This website has had
Circuit Board Counter
board
visitors so far.

This website allows you to obtain component values or time periods for circuits using the 555 timer IC.

There is also a selection of projects that can be built with a description of how they work.

The 555 timer IC comes in an 8 pin package, the voltage range for the IC is 4.5 V to 15 V.

The output will sink or source up to 200 mA.


Pinout Diagram
Pinout Diagram

Operation

Astable Operation

Oscillator
Oscillator

The output at pin 3 produces a square wave output, oscillating at a frequency determined by 2 resistors and a capacitor.

Monostable Operation

One Shot
One Shot

The output at pin 3 produces a pulse every time pin 2 is grounded, the duration of the pulse is determined by a resistor and a capacitor.

Delay On
Delay On

The output at pin 3 goes high after a set delay, the duration of the delay is determined by a resistor and a capacitor.


This site is best viewed on a PC or MAC with a screen resolution of at least 1366x768.


Please mail any queries to andrew.cl@rkson.uk and put "555" in the subject line.



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