LM324 1Hz Sine Wave

Discussion in 'The Projects Forum' started by Sramir27, Jan 29, 2015.

  1. Sramir27

    Thread Starter New Member

    Jan 29, 2015
    6
    1
    Im having difficulty finding a suitable circuit for my project. I want to (cheaply) create a 1Hz sine wave. I want to power it via 9v battery. I need this for a water activated stimulus. Two electrodes, placed in salt water, completes the circuit and is at a 1Hz freq. I have a few lm324's laying around and thought i could use them. Im just having trouble finding a perfect circuit for this, and I'm interested in any suggestions. Thank you.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,122
    3,046
    Why do you need a sine wave? A square or sawtooth wave would be easier.
     
    Sramir27 likes this.
  3. Sramir27

    Thread Starter New Member

    Jan 29, 2015
    6
    1
    It would be much easier, i agree. The species I'm stimulating though has a peak sensing ability at 1 Hz. And the waveform should be sinusoidal because it resembles the prey species I'm attempting to mimic. :(
     
  4. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Pick one.
     
    Sramir27 likes this.
  5. Sramir27

    Thread Starter New Member

    Jan 29, 2015
    6
    1
    Thank you for your reply!
     
  6. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Sramir27 and #12 like this.
  7. crutschow

    Expert

    Mar 14, 2008
    13,009
    3,233
    I like the Bubba oscillator because of it's low distortion and relative insensitivity to individual component tolerances (the frequency is close to the average value of the 4 RC values).
     
    Sramir27 and #12 like this.
  8. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,648
    763
    Will you run it permanently?

    Pay atention to the time each one could take to start and stabilize.
     
    Sramir27 likes this.
  9. Sramir27

    Thread Starter New Member

    Jan 29, 2015
    6
    1
    It will be run for about 10-15sec/30sec
     
  10. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,044
    3,807
    What prey give a 1Hz sine wave? Where is a 1Hz sine wave emitted?
     
    Sramir27 likes this.
  11. Sramir27

    Thread Starter New Member

    Jan 29, 2015
    6
    1
    It's a ventilatory activity signal that sharks seek out. 0.5-2Hz
    The literature suggests a sine wave produces the best result for stimulus.
     
    GopherT likes this.
  12. GopherT

    AAC Fanatic!

    Nov 23, 2012
    6,044
    3,807
    So, does just an electromagnetic emission/broadcast attract them or do you need some kind of physical compression of the water in a sinus mode.
     
  13. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Sharks have electrical sensors. Ampullae of Lorenzini...if I spelled it correctly.
    Gel filled pores connected directly to a nerve, each.

    Water movement is suspected to be irrelevant to those sensors.
     
  14. Sramir27

    Thread Starter New Member

    Jan 29, 2015
    6
    1
    That is true. Most fish movements are muscular and therefore use action potentials to stimulate said muscle to produce motion. These action potentials are picked up by animals that have an electroreception sense. :)
    Thank you for the assistance with the circuit guys.
     
Loading...