Mic stereo with little amp in a pencil box, i build this for my project http://www.archivosonoro.org is a non-profit project about the Soundscapes and Field recordings. This box use with a MD-510n Minidisc recorder with Analogical IN.
The goal of this project is reuse and use cheap parts, well in my country (Mexico) are a Shops with articles from China (China everywhere!!!), in this kind of Shop buy a metal boxes pencils (and other wondefull and usefull things for Build, Make and enjoy the DIY).
From my garbage electronic:
2 transistors NPN BC548 (experiment with others if you like for example: 2n2222, c1056, etc)
1 Jack plug Male Stereo
2 Electrec mic
1 Little piece of hose transparent from my old Acuarius Tank