1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

Project: Night Buzzer

Discussion in 'Electronic Projects' started by zachtheterrible, Jan 14, 2005.

Thread Status:
Not open for further replies.
  1. Stellarcore

    Stellarcore New Member

    Joined:
    Jul 23, 2007
    Messages:
    88
    Likes:
    0
    Location:
    Winnipeg, MB, Canada
    Here's an idea for those doing this with a PIC or other micro. To add a bit of evilness, setup the PICs internal timer1 as a makeshift RTC and have it chirp at random intervals between 1 and 10 minutes. You could also choose a random frequency to drive a piezo speaker.

    If it chirps with a predictable period, it is probably more likely that your device will be discovered.
     
  2. ollillo

    ollillo New Member

    Joined:
    Mar 7, 2008
    Messages:
    1
    Likes:
    0
    whats the volage rating of the electrolytic capacitor?,
    And is there other alternative for the buzzer??
     
  3. Hero999

    Hero999 Banned

    Joined:
    Apr 6, 2006
    Messages:
    14,902
    Likes:
    79
    Location:
    England
    Come on, use your common sense, what is powering the circuit?

    Just select a capacitor with a higher voltage rating than the power supply
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. veez

    veez New Member

    Joined:
    Apr 15, 2008
    Messages:
    2
    Likes:
    0

    Hi, I am interested in this project.

    I need a bit of help with the parts.

    Which LDR and buzzer did you guys use. Please specify model #

    thanks
     
  6. veez

    veez New Member

    Joined:
    Apr 15, 2008
    Messages:
    2
    Likes:
    0
    Hi , so I got a 6V DC mini buzzer.

    I tested the buzzer just connected to a 1.5V battery. And it worked.

    But when i put a resistor of even say 220 ohm in the path of the buzzer and battery, it stopped working. (maybe its making very dim sound).

    But with the whole circuit It doesnt work at all.

    Any help?

    Thanks
     
  7. audioguru

    audioguru Well-Known Member Most Helpful Member

    Joined:
    Mar 16, 2004
    Messages:
    32,445
    Likes:
    937
    Location:
    Canada, of course!
    The circuit is designed for a piezo beeper which uses a very low current, not a mechanical buzzer that uses a high current.
     
  8. wingerr

    wingerr New Member

    Joined:
    Mar 27, 2008
    Messages:
    21
    Likes:
    0
    Better make sure the victim has enough sense of humor so your poor electronic cricket doesn't get stepped on if he finds it- :)

    That would be the advantage of the cheaper and less elaborate circuit, if it does get found, more disposable-:)

    I've encountered real life crickets that would be a good model for what this should do- chirps away happily until you get close trying to find it, and then it stops, only to resume when you get tired of standing around waiting for more clues as to where it is, and walk away. Maddening. :eek:
     
  9. nitin157

    nitin157 New Member

    Joined:
    Jul 15, 2008
    Messages:
    1
    Likes:
    0
    what is the procedure for making an night buzzer procedure
     
Thread Status:
Not open for further replies.

Share This Page