added simplyfied new zero detection simulation + notes to schematic

01_volume/04_pcb/amp6c_volume/amp6c_volume.kicad_sch

@@ -1764,9 +1764,6 @@
   (junction (at 252.73 58.42) (diameter 0) (color 0 0 0 0)
     (uuid eb112459-67a8-4d38-9b76-3dad8afb3280)
   )
-  (junction (at 152.4 92.71) (diameter 0) (color 0 0 0 0)
-    (uuid eb468fd9-5d8c-4545-9de0-10a2d7f9ed47)
-  )
   (junction (at 73.66 64.77) (diameter 0) (color 0 0 0 0)
     (uuid ef01b7bd-8394-4e98-892f-f13c0636094a)
   )
@@ -1784,8 +1781,8 @@
   )
 
   (no_connect (at 257.81 106.68) (uuid df43c375-a007-4e35-a81b-dadb2008e365))
-  (no_connect (at 257.81 111.76) (uuid df43c375-a007-4e35-a81b-dadb2008e365))
+  (no_connect (at 257.81 111.76) (uuid df43c375-a007-4e35-a81b-dadb2008e366))
-  (no_connect (at 257.81 96.52) (uuid df43c375-a007-4e35-a81b-dadb2008e365))
+  (no_connect (at 257.81 96.52) (uuid df43c375-a007-4e35-a81b-dadb2008e367))
 
   (wire (pts (xy 133.35 53.34) (xy 133.35 85.09))
     (stroke (width 0) (type default) (color 0 0 0 0))
@@ -1969,10 +1966,6 @@
     (stroke (width 0) (type default) (color 0 0 0 0))
     (uuid 298ae890-ed2c-4287-9d68-42108332ab84)
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-  (wire (pts (xy 154.94 92.71) (xy 152.4 92.71))
-    (stroke (width 0) (type default) (color 0 0 0 0))
-    (uuid 29cad066-660a-47fa-83a4-dea5e3c5214a)
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   (wire (pts (xy 252.73 21.59) (xy 252.73 26.67))
     (stroke (width 0) (type default) (color 0 0 0 0))
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@@ -2973,6 +2966,11 @@
     (uuid ffba8973-2ba8-470b-a2ef-99111e2e9ebb)
   )
 
+  (text "change C14 to 6.8nF to limit Bandwidth to about 20kHz (Audio)"
+    (at 177.8 69.85 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 0abcd8f2-fe20-4b12-83aa-1f0b6ef649a3)
+  )
   (text "Input Filter & Protection\n" (at 38.1 71.12 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 1747650e-9809-4ca0-8ead-4879f53b9fc9)
@@ -2981,10 +2979,19 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 1ee8c3a7-22dd-47ca-a249-b50857547015)
   )
+  (text "fg = 1/(2*pi*1kR*6.8nF)=23.4kHz" (at 177.8 67.31 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 3a30c018-16d0-4b49-95f0-a7243fef0299)
+  )
   (text "Input Stage" (at 107.95 31.75 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 64b7a759-731e-4225-b491-0f3375a6efdf)
   )
+  (text "add zero ohm resistor or ground coupling cirquit here! -> defined starpoint guaranteed in schematic and layout\n"
+    (at 208.28 135.89 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 91d82e5d-dcf2-4a33-aa81-ff20287446c7)
+  )
   (text "Digital Potentiometer \n& Jumpers" (at 190.5 30.48 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid a138d606-bb64-444d-90fc-1cf1c7d215bc)

01_volume/06_simulation/DigitalVolumeControl.log

@@ -1,7 +1,6 @@
-Circuit: * C:\Users\kerem\Documents\git\amplifier_6c\01_volume\06_simulation\DigitalVolumeControl.asc
+Circuit: * C:\Users\Edwin\Documents\19_git\Amplifier_6C\01_volume\06_simulation\DigitalVolumeControl.asc
 
 C5: both pins shorted together -- ignoring.
-Number of points per decade reduced from 10000 to 7244.
 WARNING: Less than two connections to node 3.3V.  This node is used by V3.
 WARNING: Less than two connections to node ZEROCROSS.  This node is used by A1.
 Direct Newton iteration failed to find .op point.  (Use ".option noopiter" to skip.)
@@ -44,20 +43,21 @@ Gmin = 0
 Gmin stepping succeeded in finding the operating point.
 
 
-Date: Tue May 03 19:21:05 2022
+Date: Sat May 28 22:01:05 2022
-Total elapsed time: 5.607 seconds.
+Total elapsed time: 10.603 seconds.
 
 tnom = 27
 temp = 27
-method = trap
+method = modified trap
-totiter = 1327
+totiter = 105832
-traniter = 0
+traniter = 104505
-tranpoints = 0
+tranpoints = 26750
-accept = 0
+accept = 18596
-rejected = 0
+rejected = 8154
 matrix size = 195
 fillins = 240
 solver = Normal
-Matrix Compiler1:    1288 opcodes
+Thread vector: 62.2/50.8[4] 25.2/19.6[2] 12.0/8.7[4] 1.4/2.7[1]  2592/500
-Matrix Compiler2: 23.78 KB object code size  3.2/4.2/[1.6]
+Matrix Compiler1: 23.03 KB object code size  14.9/7.8/[4.9]
+Matrix Compiler2: 23.78 KB object code size  8.1/10.9/[1.6]
 

01_volume/06_simulation/simplyfied/DigitalVolumeControl.asc

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+SYMATTR Value SINE(0 1.821 1k)
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+SYMATTR InstName V3
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+SYMATTR Value 15
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+SYMATTR Type diode
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+SYMATTR Value 1N4148
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+TEXT 1456 -832 Left 2 ;LM393
+TEXT -992 104 Left 2 !.tran 0 3m 0 0.001
+TEXT 856 -544 Left 2 ;LM4562
+TEXT 1824 -536 Left 2 ;LM4562

01_volume/06_simulation/simplyfied/DigitalVolumeControl.log

@@ -0,0 +1,65 @@
+Circuit: * C:\Users\Edwin\Documents\19_git\Amplifier_6C\01_volume\06_simulation\simplyfied\DigitalVolumeControl.asc
+
+C5: both pins shorted together -- ignoring.
+WARNING: Less than two connections to node 3.3V.  This node is used by V3.
+WARNING: Less than two connections to node ZEROCROSS.  This node is used by A1.
+Singular matrix:  Check node u3:n013
+   Iteration No. 4
+Direct Newton iteration failed to find .op point.  (Use ".option noopiter" to skip.)
+Starting Gmin stepping
+Gmin = 10
+Gmin = 1.07374
+Gmin = 0.115292
+Gmin = 0.0123794
+Gmin = 0.00132923
+Gmin = 0.000142725
+Gmin = 1.5325e-005
+Gmin = 1.6455e-006
+Gmin = 1.76685e-007
+Gmin = 1.89714e-008
+vernier = 0.5
+vernier = 0.25
+Gmin = 5.50669e-009
+vernier = 0.125
+vernier = 0.0625
+vernier = 0.0833333
+Gmin = 5.08966e-009
+vernier = 0.111111
+vernier = 0.148148
+Gmin = 3.91412e-009
+vernier = 0.197531
+Gmin = 2.56445e-009
+vernier = 0.263374
+vernier = 0.351165
+Gmin = 1.29498e-009
+vernier = 0.46822
+vernier = 0.624294
+Gmin = 4.47912e-010
+vernier = 0.832392
+Gmin = 8.42858e-011
+vernier = 1
+Gmin = 9.36402e-012
+Gmin = 1.00545e-012
+Gmin = 1.0796e-013
+Gmin = 0
+Gmin stepping succeeded in finding the operating point.
+
+
+Date: Sat May 28 23:03:54 2022
+Total elapsed time: 0.789 seconds.
+
+tnom = 27
+temp = 27
+method = modified trap
+totiter = 7017
+traniter = 5838
+tranpoints = 1633
+accept = 1169
+rejected = 464
+matrix size = 151
+fillins = 184
+solver = Normal
+Thread vector: 54.5/19.2[4] 16.8/7.9[4] 7.1/5.6[3] 0.8/1.8[1]  2592/500
+Matrix Compiler1: 18.16 KB object code size  6.0/3.2/[1.3]
+Matrix Compiler2: 18.08 KB object code size  4.0/5.0/[0.9]
+