From: Nils <forssennils@gmail.com>
Date: Fri, 12 Jul 2024 20:10:05 +0000 (+0200)
Subject: changed values and added RIAA curve to plot
X-Git-Url: https://gitweb.forssennils.se/?a=commitdiff_plain;h=14ca4e70943300c3151d5fbafa3ae5e87e0161bb;p=phono_preamp.git

changed values and added RIAA curve to plot
---

diff --git a/matlab/calculations.m b/matlab/calculations.m
index b138286..a072e31 100644
--- a/matlab/calculations.m
+++ b/matlab/calculations.m
@@ -2,8 +2,8 @@ s = tf('s');
 Z_R4 = 180000;
 Z_R3 = 10000;
 Z_R5 = 4700;
-Z_R6 = 16000;
-Z_R7 = 330;
+Z_R6 = 100000;
+Z_R7 = 2200;
 Z_R13 = 750;
 Z_R14 = 100000;
 
@@ -22,11 +22,16 @@ H2 = ((1 / (Z_R7 + Z_C3)) + (1 / Z_R6)) * Z_R6;
 H3 = (1 / (Z_R13 * Z_C8)) / (s + (1 / (Z_R13 * Z_C8)));
 H4 = (s * Z_R14 * Z_C9 / (1 + s * Z_R14 * Z_C9));
 
-H_tot = H1 * H2 * H3 * H4;
+H_tot = (1 / 2) * H1 * H2 * H3 * H4;
+
+H_RIAA = 10 * ((s / (2 * pi * 500)) + 1) / (((s / (2 * pi * 50)) + 1)*((s / (2 * pi * 2122)) + 1));
+
+H_RIAA_amp = 100 * H_RIAA;
 
 p = bodeoptions('cstprefs');
 p.FreqUnits = 'Hz';
 p.PhaseVisible = 'off';
-p.XLim = {[10,30000]};
+p.XLim = {[20,20000]};
+
 
-bodeplot(H_tot,p)
\ No newline at end of file
+bodeplot(H_tot, H_RIAA_amp,p)
\ No newline at end of file