Connect with us

Dual 555 timer musical horn

Discussion in 'General Electronics Discussion' started by ElectricLizzie93, Mar 24, 2013.

Scroll to continue with content
  1. ElectricLizzie93


    Mar 24, 2013

    I've just built this circuit and simulated it in LTSpice (attached) for my lab project. I think I works ok, makes a sort of buzzing sound, but for my report I need to understand how it works. I understand that the left hand chip provides a pulse (the frequency of which depends on the resistor and capacitor values) which affects the timing of the right hand chip, which in turn produces the raspy horn sound. But it's my first electronics course and I can't figure out any more detail than that.

    Any clues? Thanks! :)

    Attached Files:

    • Horn.png
      File size:
      27.6 KB
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Both chips are astable multivibrators (amv). Google can give you thousands of hits when you search for this, so I won't repeat the description here.
    The left amv has a low frequency. The right amv has a frequency in the audio range. The output of the left amv controls the frequency of the right amv.
    You may want to read this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day