Louder 555 timer output

Discussion in 'The Projects Forum' started by 81zapper, Feb 3, 2016.

  1. 81zapper

    Thread Starter New Member

    Feb 3, 2016
    6
    0
    I'm am trying to create a machine gun sound from a 555 timer for an RC plane. I've got to the point where I like the sound it just is not loud enough. I tried a lm386 p but didn't help. Any ideas. Can a 555 timer output volume be increased ?
    Running on 5 Vdc
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    970
    Schematic?
     
  3. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    5 volts peak to peak can produce 0.39 watts in an 8 ohm speaker.
    The quality of the speaker is very important because they range from less than 80 db/ 1 watt to over 100 db for 1 watt.
    If you want this to, "pop" you have to optimize the driver and the speaker.
    Maybe even use higher voltage just for the sound.
     
  4. 81zapper

    Thread Starter New Member

    Feb 3, 2016
    6
    0
    here's a schematic of what I've done with an lm386 and some leds
     
  5. 81zapper

    Thread Starter New Member

    Feb 3, 2016
    6
    0
    That sucks I'm trying to be as light as possible so speaker must be fairly small it will be going into a small park flying type plane .
     
  6. 81zapper

    Thread Starter New Member

    Feb 3, 2016
    6
    0
    Or any suggestions on how to go about making a loud noise from a very small package?
     
  7. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    I feel discouraged about this. Small, efficient, and effective don't go together in the audio world. I think your only hope is to find some special transducer which is not a paper cone speaker, and I still think you won't be able to hear it from 200 feet away.
     
  8. hp1729

    Well-Known Member

    Nov 23, 2015
    1,951
    219
    Run the LM386 at 9 V or 12 V?
     
  9. 81zapper

    Thread Starter New Member

    Feb 3, 2016
    6
    0
    Thanks for your Help I thought I might of been going for something out of reach. well that's my new goal in life to invent something super small and extremely loud other than small children (LOL)
     
  10. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    Use a Tda2030 amp, or ready made amplifier on ebay. Remember bigger sound means bigger current drain.
     
  11. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,798
    1,103
    Instead of a normal speaker you could try using a really loud self-oscillating piezoelectric screecher, as used in smoke alarms etc, driven in very short bursts by the 555 circuit.
     
    #12 and 81zapper like this.
  12. 81zapper

    Thread Starter New Member

    Feb 3, 2016
    6
    0
    Thanks might give that a try
     
  13. BobTPH

    Active Member

    Jun 5, 2013
    782
    114
    A MOSFET bridge could give you 3W into an 8 Ohm speaker with a square wave.

    Bob
     
  14. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Just a note on the math...a square wave carries 2X the power of a sine wave (which has the same voltage amplitude).
    I buy speakers that can handle twice the power of my amplifier because the amp can't smoke the speaker, even if you crank it up all the way to square waves. (That doesn't work with a 2 way or 3 way speaker because the tweeters are designed to handle the normally low power in the upper frequencies, so you can still smoke the tweeties if you crank the amp to eleven.)
     
  15. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    About 55 years ago, I had a toy machine gun which made sound by slapping a metal strap against a diaphragm. Some kind of motor with a cam. Used D batteries. That design used up a lot of power, but the concept is good.
     
  16. Sonoran Desert Tortoise

    Member

    Oct 30, 2014
    53
    34
    Yup, use the motor and cam to slap a piece of spring steel to the bottom of your wing. It will sound like a drum... err, I mean, machine gun.
     
    81zapper, absf and #12 like this.
Loading...