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Underwater Microphone (Hydrophone)

Step 6Vegitable oil

vegitable oil
Pour vegetable oil into the bottle until it is nearly at the top, leaving a little room for the mic capsule.
Push the lid over the bottle opening, the mic will dip into the vegetable oil and go into the bottle,

The lid should stretch and go over the bottle and create a near air-tight seal, some vegetable oil will probably come out be sure to wipe off the oil before putting it in water, you do not want any air in the bottle it should be full of oil.

I taped around the edge, where the lid was over the bottle and wrapped more plastic wrap around it to make sure it was sealed well.

It is also a good idea to seal the lid where the cord is at with hot glue or super glue.
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1 comment
Jun 7, 2008. 6:55 PMfib3roptix says:
I used a plastic shaker cup and cup a slit in the top and sealed with electrical tape + super glue. but it doesn't work as good as yours. YOURS IS AAAWWSOOME!!

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