[sdiy] Analog VU Meter/Simple Attenuator Module

[Scott Juskiw]

>What precision do you want ? The TLN-904 is built on a pair of
>LM3914. It is faster than a galvanometer but only precise to
>+/-0.5 V
>
>   http://tellun.com/motm/diy/tln904/TLN-904.html

Actually, if you set it to PEAK mode you can use the front panel pot 
to get less than 0.5V per LED (e.g. 0.05V per LED). This is not a 
precision measurement, but I have found it handy enough to gauge the 
levels coming from -10db or +4db equipment.