555 timer based AM radio receiver published on Tube Time is one of many entries for the currently running 555 contest. This project uses a 555 timer as AM demodulator plus amplifier to drive the speaker. The radio signal is tuned with an LC tank circuit. The 555 timer is configured as a PWM where a ramp signal is created with a capacitor and a potentiometer. The radio signal picked by the LC circuit is superimposed on the ramp signal which varies the duty cycle of the output PWM wave. The variation in the duty cycle corresponds to the audio signal in the radio waves.
555 Contest Entry: AM radio – [Link]
In this Countdown Timer project, a 555 IC, a counter IC and a transistor switch to activate a relay either ON/OFF(mode selected by a jumper) as soon as the counting period is over. The circuit consists of an oscillator, a ripple counter and two switching transistors.
Simple Count Down timer Project – [Link]
Makerdino shared his light controlled screamer with 555 chips. [via]
Here’s a fun project to make with the 555 chip. It can be built as a stand alone circuit or you can put it inside a doll, toy or whatever! I’m entering this one in the 555 Contest in the Art category.
Light controlled screamer with 555s – [Link]
A matrix keypad uses rows and column arrangement of keys to reduce the required number of I/O pins for interfacing with a microcontroller. This article shows how you can use a 555 Timer IC to interface a keypad with just 2 connections. The 555 timer is configured in astable multivibrator where the output frequency changes with each key press. Based on how many times the Timer module overflows, the information about the pressed key is determined.
2-Wire Keypad Interface with a 555 Timer – [Link]
The story of the triple nickel. Jeri writes – [via]
In this video I go over some of the history of the www.555contest.com and how it grew from a few random events. I also demonstrate an AM transmitter that broadcasts tones depending on the temperature of a thermistor.
The Story of the 555 contest and Temperature to Tone Transmitter – [Link]
Hi every one. Today i’ll show you how to make a PWM (pulse width modulation) out of a very famous chip 555 (lm,ne any one will do) with some other parts offcourse. This is really simple and it is very handy if you want to control your leds, light bulb, servo motor or dc motor (brushless also works). My pwm can only change the duty cyle from 10% to 90% it cant do nothing more!
Very simple PWM with 555 – [Link]
There is a 555 contest happening that was conceived by Jeri Ellsworth and Chris Gammell. Check it out. [via]
This contest came about in mid-January 2011 on Twitter. Jeri began talking about 555 timers and excitement built up enough to start doing something about it! The organizers of the contest have no monetary interest, only interest in seeing new designs and creativity blossom. Vendors/sponsors did not prompt this contest, though they are helping organize and providing prizes. Really we’re just looking to have fun and see new designs, so be sure to submit yours!
555 contest up and running – [Link]
I made this as a quick project I made to use a lot of the LEDs I recently got. It basically connects via a 555 8 pin IC and allows for adjusting the time between the flashings by changing the resistor or capacitor values. It provides for a cool looking effect in a dark room. Use your favorite color LEDs and enjoy!
41 LED Flasher Circuit using 555 IC – [Link]
Jimmy Proton writes:
In this instructable i will teach you every thing you would ever need to know about the 555 timer IC. If you already know about the chip you could check out my slide show titled “47 projects to do with a 555” it will teach you every basic project to use a 555 with, its great for beginners!
Learn about the 555 – [Link]