AC-to-DC converter > LPF > driver
rectification > smoothing > DC to driver
Are in some way equivalent. So decide on the degree of smoothing
required and you are home. But I think we have come full circle back to
your LPF requirement
I can suggest two ways - build a channel and experiment increasing the
amount of "smoothing" until you get the look right - this is not going
to be a precision instrument. Or try modelling the circuit. I use the
open-source Qucs as it is free but you have to learn how to use it.
Grahame
On 16/02/2015 18:45, Mihai wrote:
Let me take a step back - the current schematic is not MCU based,
let's say it's analog. The building blocks are:
input amp -> bandpass filter -> lin-to-log converter -> AC-to-DC
converter -> driver
The LPF is between the AC-to-DC converter and the driver. At that
point, the audio signal has been already filtered, so in theory I
should have only the "DC" component of a specific channel/audio
frequency. Does it make more sense now?
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