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Generate frequency on speakers

Discussion in 'Electronic Basics' started by Jeffrey, Dec 18, 2005.

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  1. Jeffrey

    Jeffrey Guest

    I have a cheap speaker and a battery. What can I use to create a
    steady tone, of let's say, 2500 Hz? Is there some kind of chip I can

  2. Pooh Bear

    Pooh Bear Guest

    Many many kinds.

    It requires more than 'just a chip' though.

    Seems to me like the art of electronics design is being lost to those who
    think there's a 'chip' that will do everything/anything and doesn't need
    to have some circuitry designed around it.

  3. newtype

    newtype Guest

    1 hex inverter, 1 transistor? 2 xstrs ?, some caps and resistors.
    The inverter & caps makes up an oscillator, the transistors amp
    up the hex inverter output to the speaker.

    try a 555 oscillator to the speaker.
    try an opamp to the speaker.
    look up multivibrator for 2.5 kHz.
  4. john jardine

    john jardine Guest

    A minimum part solution (ie none) is to connect one lead of the battery to a
    speaker terminal and the other battery lead to just touch the other speaker
    pigtail wire. Gives an awfully loud square wave at about 1kHz. Bit like
    tweeking a cats whisker.
  5. James Lehman

    James Lehman Guest

    In a similar way, you can use a battery, a speaker and a relay switch. When
    the relay is powered, it opens the circuit. This should make a pretty nasty

    James. :eek:)
  6. Jeffrey

    Jeffrey Guest

    A minimum part solution (ie none) is to connect one lead of the battery to a
    I am wondering is if there is a chip, of some sort, that will produce a
    specific sound through the speakers, not some random noise.
  7. James Lehman

    James Lehman Guest

    OK, buy one of those greeting cards with the little doohickey that plays
    Jingle Bells.
  8. Yes, there are lots of them.

    And what makes you think that making a buzz by having the speaker
    interrupt its own voice coil current would be "random"? ;-)

  9. Rob B

    Rob B Guest

    that seems to be a trend in any of the high-technology fields, about 10-15 %
    with low level knowledge and design understanding where the other 85-90 %
    are component users/tinkerers/builders.
  10. Sjouke Burry

    Sjouke Burry Guest

    We used a pnp and a npn in a astable flipflop (advantage,both
    tansistors open/closed at the same time.) running on a 4.5 flat
    battery,and a small speaker as collecror resistor in one side.
    the other side had the timer resitor and the plus battey connected
    to 2 test leads. Makes a very nice audio resitance/voltage tester.
    No on/off switch,battery stayed alive for about 4 years.
    With the testleads open, both transitors remained closed,so only
    leaking current.
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