Useful afternoon project

[computer at sea]

Here's a schematic for building a resistor substitution box.  I made mine inside of an eyeglasses case.

http://farm1.static.flickr.com/44/256488526_c24973cef4_m.jpg

[iqoruvuc]

If you want to find a place that still sells them try here: <http://www2.westfalia.net/suche/index.php>