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Picture of Phone Horn Passive Amplifier
I've seen a few of these projects online lately and really wanted to have a go myself - got my opportunity this week when I picked up an old decorative bugle for £1 at the car boot.

It only took an hour or two to complete, and made for an excellent evening's tinkering.

Step 1: Horn Trimming

Picture of Horn Trimming
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I had a rough idea of the shape I wanted, so set about chopping down the horn, using my all-time favourite tool a copper pipe cutter, the kind you keep tightening and rotating, like in the opening credits for Cool Hand Luke but on a smaller scale.
 
Very well done and a great idea!!
BLUEBERRY352 years ago
GREAT IDEA,my wife is partialli deaf,im going to make one.
Thnx man