well , there's noting specials inside :
a V475 card , controll room circuit, the headphone amp, a Vumeter amp and nothig more.
the control Room circuit , is just a balanced to unmalanced recivier, with a volume control in the middle then a passive, sum to get mono version in both chalnnels, the signals come from the V475 splitted in 2 direction, one the main output and other to the control room section, then to the head phone, and VU amp.
Infront of the control room circuit there's 2 imput one for the V475, and one for monitorig the input both drived by a relay for choes what to Ear by the monitors. Wen i pusch on the illuminatd monitor switch i can lissent to the couple of the input beafor they go in the passive sum by 4 decks 11 pos switch, because the channels are splitted in 2 , one side go to the passive sum, the other side go to the switch with the end patched to one of the 2nd input of the control room.
didnt do any blok diagram so is a little difficul to make you understend but is a very easy circuit, and sound absolutely clean.
but I spent the last 8 months to study the "how to do it the simpler way" with the less number of component involved. I'm beguinner so a professional EE is faster than me.
the harder thing is to understend the concept behind the V475 card it doesn't care how many channel you patch, so my sistem is completely open, you could attach, a 8+8 channel modul, or a 4 aux x 16ch with no
intervention in the box.
thank you all guy, feel free to ask.
M.