Contact mikes

This mike is one of the easiest to built. For every ones surprise it was a speaker part in the begenning when it was connected to the amplifier as an input source, It turned out to be a well usuable contact mike. I tried to record normal precussive sounds and It did record good but what intriged me was it was very good cheap source of under water miking. Just try recording the contact mike under the water, It will give you whole new dimension of sound.