I have a question am trying to figure the easiest way build a IN-13 spectrum analyzer. I just want to know if I use band pass filters for each stage on the low input audio then us and Inverting op on that filter single to change the level form AC to 0-5 v dc signal. Then use a MJE 340 through a 270K resistor to ground will that not work to drive this display. I have been looking around on the internet and seen some much more complicated solutions so am just asking will this work.