retroazione amplificatori

Ciao

In questo schema vale

Vu / V1 =3D [ R4 / (R4 + R3) ] * [ 1 + R8 / R7 ]

Ma sapete dire perch=E8 c'=E8 anche il termine R4 / (R4 + R3) ? A cosa =E8 dovuto?

[FIDOCAD ] LI 90 50 80 50 LI 95 50 90 50 LI 100 50 95 50 LI 55 45 50 45 LI 50 45 45 45 LI 55 65 55 55 LI 60 70 55 70 MC 65 70 0 0 080 LI 65 70 60 70 LI 55 65 55 70 LI 90 70 90 50 LI 90 70 80 70 LI 80 70 75 70 LI 90 70 90 75 MC 90 75 1 0 080 MC 35 45 0 0 080 TY 40 35 5 4 0 0 0 * R1 MC 110 50 0 0 080 LI 125 50 120 50 MC 15 45 0 0 040 MC 55 45 0 0 580 TY 65 75 5 4 0 0 0 * R2 MC 35 45 1 0 470 TY 15 35 5 4 0 0 0 * V1 MC 40 85 1 0 470 MC 20 85 0 0 040 TY 35 90 5 4 0 0 0 * V2 LI 90 85 40 85 LI 90 85 110 85 LI 110 50 95 50 LI 125 60 125 75 LI 125 75 140 75 MC 140 75 0 0 080 LI 155 75 150 75 LI 155 75 155 55 LI 155 55 145 55 LI 155 55 165 55 SA 165 55 TY 150 75 5 4 0 0 0 * R5 MC 110 85 0 0 080 TY 110 90 5 4 0 0 0 * R7 TY 170 50 5 4 0 0 0 * Vu LI 125 75 125 80 LI 125 80 125 85 LI 125 85 120 85 LI 155 55 155 35 TY 105 55 5 4 0 0 0 * R3 LI 125 50 125 35 LI 125 35 135 35 MC 135 35 0 0 080 LI 155 35 150 35 LI 150 35 145 35 TY 140 25 5 4 0 0 0 * R4 TY 95 75 5 3 0 0 0 * R6 TY 65 35 5 3 0 0 0 * Ao1 MC 125 50 0 0 580 TY 140 45 5 3 0 0 0 * Ao2
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Gabry
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