stomp board

Discussion in 'The Projects Forum' started by cbg1, Mar 13, 2013.

  1. cbg1

    Thread Starter New Member

    Mar 12, 2013
    2
    0
    have been building different versions of these with mixed results.

    the concept is unit that you can tap with your foot and produce a bass drum sound. it is plugged into an amplifier or pa system.

    i first tried a piezo element which produced more of a knocking sound than a thump.

    i next tried a guitar pickup mounted under a metal licence plate ( a ferrous one) and got better results.

    i came across this product but it seems to me to be rather pricey for what appears to be a 2 inch speaker, an audio transformer and a 1/4" jack.

    http://www.peterman.com.au/music/diy/stomp-box-bass-transducer-pickup-student

    can any one help with information regarding the transformer specs required for this application as well as a north american/canadian source.

    i would be plugging it in to a guitar/bass amplifier. guitar pickups range from 6k to 13k in resistance.


    thanks
    ets
     
  2. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Looks like a speaker as an inductive microphone, which makes a very small voltage AC signal when you "stomp" it.

    [​IMG]

    Then an audio coupling transformer used to step up the low signal to a higher voltage signal ie 0.5v to 1v p/p needed for an instrument amplifier.

    I'm only guessing but it's most likely the transformer is a low to high impedance type, and might even be a tiny speaker transformer, something like 8 ohms to 1000 ohms.

    Also you will probably find the speaker cone has a flat weight glued to it so vertical forces on the speaker make the cone move via the inertial tendency of the cone weight to remain still.
     
    Last edited: Mar 15, 2013
  3. cbg1

    Thread Starter New Member

    Mar 12, 2013
    2
    0
    thank you very much for your advice.
    the weight on the speaker cone makes sense.

    i'll start to search for a transformer source using those parameters.

    cheers.
     
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