You can also check out the step by step project at Instructables.
The is a harp mic based on the iMic. It is a super easy build, cheap build and works great. My harmonic skills are pretty weak but it not like this will only record harp. I have used it for vocal into an amp and micing that amp. Is that weird? It is a dynamic mic and will work like one.
A lot of people have built these. Harp player have been somewhat forsaken by mainstream equipment makers so they are good at doing it themselves. Mine was built out of a lotion container of my wife's saved from the trash. It was perfect for this because under the screw on lid is a plastic top the was easy to cut a whole to mount the cartridge in. Yhe whole think was built during the a Newer Sopranos's(you can't miss anything because nothing ever happens anymore."
Here is some links to pictures of other builds:
Harmonica Typepad
Marmonica Masterclass (towards bottom)
Here is the make magazine link to constructing it:
Make
The schematic is in French so I drew my own(forgive my art skills.)
I used the kobetone 25lmo32 available at mouser. They have the 2 other parts also:
There are a lot of elements of to use of course ebay etc. and a near infinite amount of case options. I keep my eye open for a cool cases at the junks shops.