Refine headphone mix requirements, fix signal flow

README.md

@@ -24,9 +24,10 @@ General requirements:
     * On-Air switch (on/ off position, with state LED)
     * Temporary mute button (momentary switch)
 - 3x Headphone output (6.3 mm mono/ stereo (2x mono) jack)
-    * Should output mix of native audio and own microphone
+    * Should output mix of native audio, own microphone and other translator's microphone
     * Potentiometer for output volume
     * Potentiometer for volume of own microphone in the mix
+    * Potentiometer for volume of other two microphones in the mix
 - Outputs:
     * Sum of all translators (XLR/ 6.3 mm balanced jack combo connector)
 
@@ -73,12 +74,7 @@ For the microphone preamp, we are using the NE5534 low-noise opamp with a circui
 In a normal mixer, you would be able to lower the microphone's volume to zero.
 But in our case we just need on/ off and some gain range to adjust for different microphones and loudness of different people.
 
-TODO: Try, if the preamp's gain of about 50 dB is enough and how much gain is need in this stage.
+TODO: Integrate the On-Air button with it's LEDs
-From theoretical calculations, we might need another 30 to 40 dB here, which needs to be adjustable in a range of about 30 dB.
-
-TODO: Try out using the amp's feedback resistor for gain control or just use a potentiometer on the input of the next stage.
-
-TODO: Integrate the On-Air button
 
 For long-lasting endurance of the microphone level potentiometer, we're using one with conductive plastic as resistor element (Bourns model 91).
 
@@ -105,19 +101,15 @@ TODO: How to achieve galvanic isolation?
 #### Headphone Output Driver
 The headphone output needs a maximum output power of about 0.1 W and should put the mono signal on both stereo channels of the TRS jack.
 
-For the first draft, we're using one LM386 audio power amplifier --> way too much amplification!
+For the first draft, we're using one LM386 audio power amplifier even though it has a quite high minimal amplification of factor 20.
-
-TODO: Check, if driving the two speakers in parallel leads to any issues (besides cutting the speaker impedance in half).
 
 #### VU Meter
 Because the LM3916 LED bar graph driver is obsolete, we either have to re-create it's function with some comperators or have to use a microcontroller.
 
-TODO: Re-create the LM3916 with some LM339 or design/ program some small uC.
-
 
 
 ## Notes
-A dynamic microphone needs at least 60 dB gain in the pre-amp, because a typical signal is at about 1 - 100 uV (-118 to -78 dBu or -120 to -80 dBV).
+A dynamic microphone needs at least 50-60 dB gain in the pre-amp, because a typical signal is at about 1 - 100 uV (-118 to -78 dBu or -120 to -80 dBV).
 
 Line level in professional audio gear is at +4 dBu, which is 1.228 V (RMS).
 Because 0 dBu is defined as 1 mW at a load of 600 Ohm, which needs a voltage of 0.77 V.

schematics/mixer/c3lingo-interpreter-unit-cache.lib

@@ -134,6 +134,23 @@ X Pin_3 3 200 -100 150 L 50 50 1 1 P
 ENDDRAW
 ENDDEF
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+# Connector_TestPoint
+#
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+F0 "TP" 0 270 50 H V C CNN
+F1 "Connector_TestPoint" 0 200 50 H V C CNN
+F2 "" 200 0 50 H I C CNN
+F3 "" 200 0 50 H I C CNN
+$FPLIST
+ Pin*
+ Test*
+$ENDFPLIST
+DRAW
+C 0 130 30 0 1 0 N
+X 1 1 0 0 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # Connector_XLR3_AudioJack3_Combo_Ground
 #
 DEF Connector_XLR3_AudioJack3_Combo_Ground J 0 20 Y N 2 F N
@@ -275,6 +292,48 @@ X 3 3 0 -150 50 U 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# Device_R_POT_Dual
+#
+DEF Device_R_POT_Dual RV 0 40 Y N 1 F N
+F0 "RV" 0 150 50 H V C CNN
+F1 "Device_R_POT_Dual" 0 75 50 H V C CNN
+F2 "" 250 -75 50 H I C CNN
+F3 "" 250 -75 50 H I C CNN
+$FPLIST
+ Potentiometer*
+$ENDFPLIST
+DRAW
+S -350 -60 -150 -140 0 1 10 N
+S 150 -60 350 -140 0 1 10 N
+P 2 0 1 0 -250 0 -250 -40 N
+P 2 0 1 0 -250 0 -250 -40 N
+P 2 0 1 0 -250 0 -230 20 N
+P 2 0 1 0 -220 20 -200 20 N
+P 2 0 1 0 -180 20 -160 20 N
+P 2 0 1 0 -140 20 -120 20 N
+P 2 0 1 0 -100 20 -80 20 N
+P 2 0 1 0 -60 20 -40 20 N
+P 2 0 1 0 -20 20 0 20 N
+P 2 0 1 0 20 20 40 20 N
+P 2 0 1 0 60 20 80 20 N
+P 2 0 1 0 100 20 120 20 N
+P 2 0 1 0 140 20 160 20 N
+P 2 0 1 0 180 20 200 20 N
+P 2 0 1 0 220 20 240 20 N
+P 2 0 1 0 250 0 250 -40 N
+P 2 0 1 0 250 0 250 -40 N
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+X 4 4 100 -100 50 R 50 50 1 1 P
+X 5 5 250 100 100 D 50 50 1 1 P
+X 6 6 400 -100 50 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # JBeyerstedt-Library_DRV134PA
 #
 DEF JBeyerstedt-Library_DRV134PA U 0 10 Y Y 1 F N

schematics/mixer/c3lingo-interpreter-unit.sch

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-F 3 "~" H 7600 8400 50  0001 C CNN
+F 3 "TODO: Footprint no final!" H 7600 8400 50  0001 C CNN
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@@ -694,7 +694,7 @@ Wire Wire Line
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 Connection ~ 8950 8500
 Wire Wire Line
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@@ -885,7 +885,7 @@ Text GLabel 7200 2000 2    50   Output ~ 0
 Mic1
 Text GLabel 1150 4800 0    50   Input ~ 0
 Mic1
-Text GLabel 8350 2350 0    50   Input ~ 0
+Text GLabel 8350 850  0    50   Input ~ 0
 Stage
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@@ -1026,7 +1026,7 @@ Wire Wire Line
 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Connection ~ 2000 5200
@@ -1036,7 +1036,7 @@ Connection ~ 2300 5200
 Text GLabel 4350 5000 2    50   Output ~ 0
 MicSum
 Wire Wire Line
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 Wire Wire Line
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@@ -1123,8 +1123,8 @@ F 3 "" H 11150 1150 50  0001 C CNN
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 	0    1    1    0   
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+Text GLabel 8350 1600 0    50   Input ~ 0
-MicSum
+Mic1
 Text Notes 12250 3000 0    50   ~ 10
 Headphone driver\nGain: 26 dB (20)
 Text GLabel 11650 4500 0    50   Input ~ 0
@@ -1147,24 +1147,24 @@ $EndComp
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-F 3 "~" H 8950 2350 50  0001 C CNN
+F 3 "~" H 10050 1600 50  0001 C CNN
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-F 3 "~" H 10050 1600 50  0001 C CNN
+F 3 "TODO: Footprint no final!" H 8950 1100 50  0001 C CNN
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@@ -1199,12 +1199,10 @@ F 3 "~" H 10950 2300 50  0001 C CNN
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 Summing Module\nGain: -inf to 0 dB
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 Wire Wire Line
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-Wire Wire Line
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-Wire Wire Line
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@@ -1361,15 +1335,12 @@ Wire Wire Line
 Wire Wire Line
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 NoConn ~ 7750 8400
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-NoConn ~ 1600 5500
-NoConn ~ 10200 1600
 NoConn ~ 2750 2300
 NoConn ~ 2850 2300
 NoConn ~ 2750 1700
 Wire Wire Line
 	15100 9100 15600 9100
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+Text Notes 8150 750  0    50   ~ 0
 TODO: Try 10K or 100K poti\nwith matching feedback R\n(Keep LP filter in mind!)
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@@ -1492,7 +1463,7 @@ Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
@@ -1728,13 +1699,13 @@ Wire Wire Line
 Wire Wire Line
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@@ -1765,12 +1736,12 @@ TODO: On-Air button LEDs\n(actually one rd, one gn,\nwith common anode)
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-HP Filter?\nf_c = 2.8 Hz\nTODO: Try 100 nF\nfor 300 Hz\n\nf_c = 1/(2*PI*R*C)
+HP Filter?\nf_c = 2.8 Hz\nTODO: Try 47R\nfor 300 Hz\n\nf_c = 1/(2*PI*R*C)
 Text Notes 5650 2650 0    50   ~ 0
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 Wire Wire Line
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+Wire Wire Line
+	15100 8150 15600 8150
+Connection ~ 7150 2000
+Wire Wire Line
+	7150 2000 7000 2000
+$Comp
+L Connector:TestPoint TP3
+U 1 1 5FC89275
+P 8400 1600
+F 0 "TP3" H 8400 1925 50  0000 C CNN
+F 1 "Mic1" H 8400 1834 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 8600 1600 50  0001 C CNN
+F 3 "~" H 8600 1600 50  0001 C CNN
+	1    8400 1600
+	1    0    0    -1  
+$EndComp
+Connection ~ 8400 1600
+Wire Wire Line
+	8400 1600 8950 1600
+$Comp
+L Connector:TestPoint TP4
+U 1 1 5FC89B55
+P 8350 2350
+F 0 "TP4" H 8350 2675 50  0000 C CNN
+F 1 "Mic2" H 8350 2584 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 8550 2350 50  0001 C CNN
+F 3 "~" H 8550 2350 50  0001 C CNN
+	1    8350 2350
+	1    0    0    -1  
+$EndComp
+$Comp
+L Connector:TestPoint TP5
+U 1 1 5FC8A1ED
+P 8350 2850
+F 0 "TP5" H 8350 3175 50  0000 C CNN
+F 1 "Mic3" H 8350 3084 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 8550 2850 50  0001 C CNN
+F 3 "~" H 8550 2850 50  0001 C CNN
+	1    8350 2850
+	1    0    0    -1  
+$EndComp
+$Comp
+L Connector:TestPoint TP2
+U 1 1 5FC8AC2C
+P 8400 850
+F 0 "TP2" H 8400 1083 50  0000 C CNN
+F 1 "Stage" H 8400 1174 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 8600 850 50  0001 C CNN
+F 3 "~" H 8600 850 50  0001 C CNN
+	1    8400 850 
+	-1   0    0    1   
+$EndComp
+Connection ~ 8400 850 
+Wire Wire Line
+	8400 850  8950 850 
+$Comp
+L Connector:TestPoint TP8
+U 1 1 5FC8BE08
+P 9350 8500
+F 0 "TP8" H 9350 8825 50  0000 C CNN
+F 1 "Stage" H 9350 8734 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 9550 8500 50  0001 C CNN
+F 3 "~" H 9550 8500 50  0001 C CNN
+	1    9350 8500
+	1    0    0    -1  
+$EndComp
+Connection ~ 9350 8500
+Wire Wire Line
+	9350 8500 9400 8500
+$Comp
+L Connector:TestPoint TP7
+U 1 1 5FC8E79D
+P 4300 5000
+F 0 "TP7" H 4300 5325 50  0000 C CNN
+F 1 "MicSum" H 4300 5234 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 4500 5000 50  0001 C CNN
+F 3 "~" H 4500 5000 50  0001 C CNN
+	1    4300 5000
+	1    0    0    -1  
+$EndComp
+Connection ~ 4300 5000
+Wire Wire Line
+	4300 5000 4000 5000
+$Comp
+L Connector:TestPoint TP6
+U 1 1 5FC8F283
+P 11700 4500
+F 0 "TP6" H 11700 4825 50  0000 C CNN
+F 1 "MicSum" H 11700 4734 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 11900 4500 50  0001 C CNN
+F 3 "~" H 11900 4500 50  0001 C CNN
+	1    11700 4500
+	1    0    0    -1  
+$EndComp
+Connection ~ 11700 4500
+Wire Wire Line
+	11700 4500 12750 4500
+$Comp
+L Connector:TestPoint TP9
+U 1 1 5FC9AA71
+P 1200 4800
+F 0 "TP9" H 1200 5125 50  0000 C CNN
+F 1 "Mic1" H 1200 5034 50  0000 C CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 1400 4800 50  0001 C CNN
+F 3 "~" H 1400 4800 50  0001 C CNN
+	1    1200 4800
+	1    0    0    -1  
+$EndComp
+Connection ~ 1200 4800
+Wire Wire Line
+	1200 4800 1600 4800
+$Comp
+L Connector:TestPoint TP10
+U 1 1 5FC9B2AB
+P 1200 5150
+F 0 "TP10" H 1258 5268 50  0000 L CNN
+F 1 "Mic2" H 1258 5177 50  0000 L CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 1400 5150 50  0001 C CNN
+F 3 "~" H 1400 5150 50  0001 C CNN
+	1    1200 5150
+	1    0    0    -1  
+$EndComp
+$Comp
+L Connector:TestPoint TP11
+U 1 1 5FC9BB36
+P 1200 5500
+F 0 "TP11" H 1258 5618 50  0000 L CNN
+F 1 "Mic3" H 1258 5527 50  0000 L CNN
+F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 1400 5500 50  0001 C CNN
+F 3 "~" H 1400 5500 50  0001 C CNN
+	1    1200 5500
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1200 5150 1600 5150
+Wire Wire Line
+	1200 5500 1600 5500
+Wire Wire Line
+	8350 2850 8950 2850
+Wire Wire Line
+	8350 2350 8950 2350
 $EndSCHEMATC