Connect with us

DC & Buzzer

Discussion in 'Electronics Homework Help' started by Muhasaresa, Jan 22, 2012.

Scroll to continue with content
  1. Muhasaresa

    Muhasaresa

    45
    2
    Jan 2, 2012
    Hi everyone :D

    Please can someone help me with these two questions?

    1. Why does a buzzer sound when a steady DC from a battery goes through (so just one battery, wires and a buzzer)? Why does the metal diaphragm vibrate when the voltage is steady?

    2. Would an electrolytic capacitor get damaged if AC was passing through it.

    Thanks for the help :)

    Muhasaresa
     
  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    1. Have you ever examined how a buzzer is constructed? If your buzzer is covered, have you torn it apart to see what is there? Everyone should do that at least once. Inside you should see an electromagnet coil and switch contacts. Draw a schematic of the whole thing and tell us how you think it works.

    2. When an electrolytic capacitor is used to pass AC it is usually the case that the AC is superimposed on a larger DC voltage so the capacitor sees the AC as just just higher and lower values of DC voltage. But this is where the capacitor equivalent series resistance ESR becomes important since the AC component of the DC voltage results in an AC current flowing through the ESR generating heat. Too much heat will destroy the capacitor.
     
  3. Muhasaresa

    Muhasaresa

    45
    2
    Jan 2, 2012
    Thanks :)

    So does it work the same way as a school bell?

    buzzer.png
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,642
    2,690
    Nov 17, 2011
  5. Muhasaresa

    Muhasaresa

    45
    2
    Jan 2, 2012
    Thanks! When I get another buzzer I will tear it apart :) Piezo buzzers look very clever.

    Best Wishes,

    Muhasaresa
     
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.
Similar Threads
There are no similar threads yet.
Loading...
Electronics Point Logo
Continue to site
Quote of the day

-