Attention please !!! 

1. Reference designators in my schematic are totally different, than in schematic described by IZ7ATH.
2. Pin usage of TL084 is also slightly different. 

So, looking at the board, look at the schematic provided by me. If you will use schematic provided by IZ7ATH, you will be confused (I know it from my experience also :) ). 

Although there is a power switch SW1 shown on the schematic, board is connected to the battery directly ("Battery +/-" contacts). If you need that switch, it should be connected in series with battery + lead.

Board layout is tested and has no errors. After correct assembly, device works perfectly (you just need to set max current for uA meter, using pot R4). 

Gintaras

gintaras_bar at yahoo dot com