More 555 Projects to Enjoy

We love all of the projects that are coming out for the 555 design contest, so we thought we would share a couple more that have caught our collective eye.  Have a 555 project of your own? Be sure to share it with us, and keep an eye out for the contest submission dates. Read on for a few of our project picks.

A wonderful combination of a number of commonly used ICs, this amplifier with built in visualizations features the LM3915 as a circular VU meter, a TDA2003 audio amp chip, as well as a 555 to control an LED “breathing” light. Sure the role of the 555 is limited as of now, but there is plenty of time to beef up any designs before the contest is over.

A follow up to a previous project we covered, this revamped low cost fuel injection tester, this build by [Dino] has taken in to account some of the suggestions by Hackaday commentors to step up the submission. Be sure to check out the explanation video, as well as a video in action.

This odd looking perforated disk acts similarly to a record, however it uses optical sensors in place of a needle to sense notes of a “song”. Using 555 timers to generate the audio signals, this project definitely has a distinctive sound to it. Right now it is hand turned, and the resolution seems a bit low, but a quick servo or stepper add on and some more fine tuning could yield a very unique music box build.

Comments

  1. Whatnot says:

    He should double-drive the LEDs of that circular VU meter to make a clockwise and counterclockwise symmetric effect
    Just using 2 LEDs where there is one is quick and cheap and simple.

  2. falldeaf says:

    Heh, that’s a sweet idea, Whatnot. I was thinking about making another more refined version of this and I might have to include that.

  3. walt says:

    duuuuh. why not program a pic to do these jobs? duuuuh. jk, 555 is one of the best ICs ever made. reliable, flexible, practical, awesome. nice projects!

  4. Reggie says:

    I like the ‘music wheel’ reminds me of an old musical box, with the rotating drum :)

  5. DeadlyDad says:

    Here’s a 555 circuit that I’d like to see: it watches for a trigger, then sends a pulse and starts a 2 minute (or w/e) timer that keeps being reset as long as another trigger comes in before the 2 minutes is up. Once the 2 minutes have gone by, it sends another pulse, and resets the whole thing. (It would use a motion detector to start recording video (i.e. press the ‘record’ button on a video camera) when movement is detected, then press it again when there has been no movement for 2 minutes.)

  6. paul says:

    Hackhut is proud to be sponsoring the contest! We’re gonna have a related mini contest on our site. So anyone who hosts their entry with us will be eligible to win other prizes

  7. o says:

    You could’ve used a 556 for that. Duh.

    /trolling

  8. Whatnot says:

    lol o, it’s so weird to me how a 556 is only like 5 or 10 cents more than a 555 and when you need a 555 you do get tempted but then you need to think up a reason for the extra timer, it’s sheer torture :)

  9. Harry Moore says:

    Heres 555
    timhttp://www.taswegian.com/NBTV/forum/viewtopic.php?t=1318er project mechanical sstv replacing the old p7 crt with a glow drum

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