Schematic: Bugfixes, VU meter draft, first development PCB draft

README.md

@@ -34,6 +34,7 @@ All inputs (besides the microphones) and outputs should:
 - expect/ deliver a nominal level of +6dBu (german TV broadcast standard, 0 dBu = 0,775 Veff)
 - be transformer balanced and galvanically isolated
 
+This results in a signal flow like this: ![](docs/signal-flow.jpg)
 
 
 ## Status
@@ -77,7 +78,7 @@ From theoretical calculations, we might need another 30 to 40 dB here, which nee
 
 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 and mute buttons
+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).
 
@@ -104,7 +105,7 @@ 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.
+For the first draft, we're using one LM386 audio power amplifier --> way too much amplification!
 
 TODO: Check, if driving the two speakers in parallel leads to any issues (besides cutting the speaker impedance in half).
 

schematics/c3lingo-interpreter-unit-cache.lib

@@ -1,32 +1,6 @@
 EESchema-LIBRARY Version 2.4
 #encoding utf-8
 #
-# Amplifier_Audio_LM386
-#
-DEF Amplifier_Audio_LM386 U 0 5 Y Y 1 F N
-F0 "U" 50 300 50 H V L CNN
-F1 "Amplifier_Audio_LM386" 50 200 50 H V L CNN
-F2 "" 100 100 50 H I C CNN
-F3 "" 200 200 50 H I C CNN
-$FPLIST
- SOIC*3.9x4.9mm*P1.27mm*
- DIP*W7.62mm*
- MSSOP*P0.65mm*
- TSSOP*3x3mm*P0.5mm*
-$ENDFPLIST
-DRAW
-P 4 0 1 10 200 0 -200 200 -200 -200 200 0 f
-X GAIN 1 0 -300 200 U 50 20 1 1 I
-X - 2 -300 -100 100 R 50 50 1 1 I
-X + 3 -300 100 100 R 50 50 1 1 I
-X GND 4 -100 -300 150 U 50 50 1 1 W
-X ~ 5 300 0 100 L 50 50 1 1 O
-X V+ 6 -100 300 150 D 50 50 1 1 W
-X BYPASS 7 0 300 200 D 50 20 1 1 I
-X GAIN 8 100 -300 250 U 50 20 1 1 I
-ENDDRAW
-ENDDEF
-#
 # Amplifier_Operational_LM358
 #
 DEF Amplifier_Operational_LM358 U 0 5 Y Y 3 L N
@@ -34,7 +8,7 @@ F0 "U" 0 200 50 H V L CNN
 F1 "Amplifier_Operational_LM358" 0 -200 50 H V L CNN
 F2 "" 0 0 50 H I C CNN
 F3 "" 0 0 50 H I C CNN
-ALIAS LM358 AD8620 LMC6062 LMC6082 TL062 TL072 TL082 NE5532 SA5532 RC4558 RC4560 RC4580 LMV358 TS912 TSV912IDT TSV912IST TLC272 TLC277 MCP602 OPA1678 OPA2134 OPA2340 OPA2376xxD OPA2376xxDGK MC33078 MC33178 LM4562 OP249 OP275 ADA4075-2 MCP6002-xP MCP6002-xSN MCP6002-xMS LM7332 OPA2333xxD OPA2333xxDGK LMC6482 LT1492 LTC6081xMS8 LM6172 MCP6L92 NJM2043 NJM2114 NJM4556A NJM4558 NJM4559 NJM4560 NJM4580 NJM5532 ADA4807-2ARM OPA2691 LT6234 OPA2356xxD OPA2356xxDGK OPA1612AxD MC33172 OPA1602 TLV2372 LT6237 OPA2277 MCP6022
+ALIAS LM358 AD8620 LMC6062 LMC6082 TL062 TL072 TL082 NE5532 SA5532 RC4558 RC4560 RC4580 LMV358 TS912 TSV912IDT TSV912IST TLC272 TLC277 MCP602 OPA1678 OPA2134 OPA2340 OPA2376xxD OPA2376xxDGK MC33078 MC33178 LM4562 OP249 OP275 ADA4075-2 MCP6002-xP MCP6002-xSN MCP6002-xMS LM7332 OPA2333xxD OPA2333xxDGK LMC6482 LT1492 LTC6081xMS8 LM6172 MCP6L92 NJM2043 NJM2114 NJM4556A NJM4558 NJM4559 NJM4560 NJM4580 NJM5532 ADA4807-2ARM OPA2691 LT6234 OPA2356xxD OPA2356xxDGK OPA1612AxD MC33172 OPA1602 TLV2372 LT6237 OPA2277 MCP6022 MCP6V67EMS
 $FPLIST
  SOIC*3.9x4.9mm*P1.27mm*
  DIP*W7.62mm*
@@ -88,6 +62,44 @@ X C/B 8 0 300 200 D 50 20 1 1 I
 ENDDRAW
 ENDDEF
 #
+# Comparator_LM339
+#
+DEF Comparator_LM339 U 0 5 Y Y 5 L N
+F0 "U" 0 200 50 H V L CNN
+F1 "Comparator_LM339" 0 -200 50 H V L CNN
+F2 "" -50 100 50 H I C CNN
+F3 "" 50 200 50 H I C CNN
+ALIAS LMV339
+$FPLIST
+ SOIC*3.9x8.7mm*P1.27mm*
+ TSSOP*4.4x5mm*P0.65mm*
+$ENDFPLIST
+DRAW
+P 4 1 1 10 -200 200 200 0 -200 -200 -200 200 f
+P 7 1 1 5 130 -20 110 -20 130 0 110 20 90 0 110 -20 90 -20 N
+P 4 2 1 10 -200 200 200 0 -200 -200 -200 200 f
+P 7 2 1 5 130 -20 110 -20 130 0 110 20 90 0 110 -20 90 -20 N
+P 4 3 1 10 -200 200 200 0 -200 -200 -200 200 f
+P 7 3 1 5 130 -20 110 -20 130 0 110 20 90 0 110 -20 90 -20 N
+P 4 4 1 10 -200 200 200 0 -200 -200 -200 200 f
+P 7 4 1 5 130 -20 110 -20 130 0 110 20 90 0 110 -20 90 -20 N
+X ~ 2 300 0 100 L 50 50 1 1 C
+X - 4 -300 -100 100 R 50 50 1 1 I
+X + 5 -300 100 100 R 50 50 1 1 I
+X ~ 1 300 0 100 L 50 50 2 1 C
+X - 6 -300 -100 100 R 50 50 2 1 I
+X + 7 -300 100 100 R 50 50 2 1 I
+X - 10 -300 -100 100 R 50 50 3 1 I
+X + 11 -300 100 100 R 50 50 3 1 I
+X ~ 13 300 0 100 L 50 50 3 1 C
+X ~ 14 300 0 100 L 50 50 4 1 C
+X - 8 -300 -100 100 R 50 50 4 1 I
+X + 9 -300 100 100 R 50 50 4 1 I
+X V- 12 -100 -300 150 U 50 50 5 1 W
+X V+ 3 -100 300 150 D 50 50 5 1 W
+ENDDRAW
+ENDDEF
+#
 # Connector_AudioJack3_Ground
 #
 DEF Connector_AudioJack3_Ground J 0 20 Y Y 1 F N
@@ -200,34 +212,6 @@ X ~ G -100 -300 100 U 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
-# Converter_ACDC_TMLM04253
-#
-DEF Converter_ACDC_TMLM04253 PS 0 20 Y Y 1 F N
-F0 "PS" 0 250 50 H V C CNN
-F1 "Converter_ACDC_TMLM04253" 0 -250 50 H V C CNN
-F2 "Converter_ACDC:Converter_ACDC_TRACO_TMLM-04_THT" 0 -350 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-ALIAS TMLM04253
-$FPLIST
- Converter*ACDC*TRACO*TMLM*04*
-$ENDFPLIST
-DRAW
-A -285 38 28 -1525 -275 0 1 0 N -310 25 -260 25
-A -235 11 29 292 1508 0 1 0 N -210 25 -260 25
-S -400 200 400 -200 0 1 10 f
-P 2 0 1 0 -310 -25 -210 -25 N
-P 2 0 1 0 0 -100 0 -150 N
-P 2 0 1 0 0 0 0 -50 N
-P 2 0 1 0 0 100 0 50 N
-P 2 0 1 0 0 200 0 150 N
-X Vout1 2 500 100 100 L 50 50 1 1 w
-X Common 3 500 0 100 L 50 50 1 1 w
-X Vout2 4 500 -100 100 L 50 50 1 1 w
-X AC(L) 5 -500 100 100 R 50 50 1 1 W
-X AC(N) 6 -500 -100 100 R 50 50 1 1 W
-ENDDRAW
-ENDDEF
-#
 # Device_C
 #
 DEF Device_C C 0 10 N Y 1 F N
@@ -266,6 +250,51 @@ X ~ 2 0 -150 110 U 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# Device_D
+#
+DEF Device_D D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_D" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ TO-???*
+ *_Diode_*
+ *SingleDiode*
+ D_*
+$ENDFPLIST
+DRAW
+P 2 0 1 10 -50 50 -50 -50 N
+P 2 0 1 0 50 0 -50 0 N
+P 4 0 1 10 50 50 50 -50 -50 0 50 50 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_LED
+#
+DEF Device_LED D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_LED" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ LED*
+ LED_SMD:*
+ LED_THT:*
+$ENDFPLIST
+DRAW
+P 2 0 1 10 -50 -50 -50 50 N
+P 2 0 1 0 -50 0 50 0 N
+P 4 0 1 10 50 -50 50 50 -50 0 50 -50 N
+P 5 0 1 0 -120 -30 -180 -90 -150 -90 -180 -90 -180 -60 N
+P 5 0 1 0 -70 -30 -130 -90 -100 -90 -130 -90 -130 -60 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # Device_R
 #
 DEF Device_R R 0 0 N Y 1 F N
@@ -352,20 +381,44 @@ X NC 8 0 150 300 R 59 59 1 1 N
 ENDDRAW
 ENDDEF
 #
-# Switch_SW_Push_Open
+# Jumper_Jumper_3_Bridged12
 #
-DEF Switch_SW_Push_Open SW 0 40 N N 1 F N
-F0 "SW" 0 100 50 H V C CNN
-F1 "Switch_SW_Push_Open" 0 -75 50 H V C CNN
+DEF Jumper_Jumper_3_Bridged12 JP 0 0 Y N 1 F N
+F0 "JP" -100 -100 50 H V C CNN
+F1 "Jumper_Jumper_3_Bridged12" 0 110 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Jumper*
+ TestPoint*3Pads*
+ TestPoint*Bridge*
+$ENDFPLIST
+DRAW
+A -65 -50 89 1282 518 0 1 0 N -120 20 -10 20
+C -130 0 20 0 0 0 N
+C 0 0 20 0 0 0 N
+C 130 0 20 0 0 0 N
+P 2 0 1 0 0 -50 0 -20 N
+X A 1 -250 0 100 R 50 50 1 1 P
+X C 2 0 -150 100 U 50 50 1 1 I
+X B 3 250 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_Push
+#
+DEF Switch_SW_Push SW 0 40 N N 1 F N
+F0 "SW" 50 100 50 H V L CNN
+F1 "Switch_SW_Push" 0 -60 50 H V C CNN
 F2 "" 0 200 50 H I C CNN
 F3 "" 0 200 50 H I C CNN
 DRAW
 C -80 0 20 0 1 0 N
 C 80 0 20 0 1 0 N
-P 2 0 1 0 -100 -25 100 -25 N
-P 2 0 1 0 0 -25 0 50 N
-X A 1 -200 0 100 R 50 50 0 1 P
-X B 2 200 0 100 L 50 50 1 1 P
+P 2 0 1 0 0 50 0 120 N
+P 2 0 1 0 100 50 -100 50 N
+X 1 1 -200 0 100 R 50 50 0 1 P
+X 2 2 200 0 100 L 50 50 0 1 P
 ENDDRAW
 ENDDEF
 #
@@ -422,23 +475,6 @@ X -15V 1 0 0 0 U 50 50 0 0 W N
 ENDDRAW
 ENDDEF
 #
-# power_Earth_Protective
-#
-DEF power_Earth_Protective #PWR 0 0 Y Y 1 F P
-F0 "#PWR" 250 -250 50 H I C CNN
-F1 "power_Earth_Protective" 450 -150 50 H I C CNN
-F2 "" 0 -100 50 H I C CNN
-F3 "" 0 -100 50 H I C CNN
-DRAW
-C 0 -150 100 0 1 0 N
-P 2 0 1 0 -25 -175 25 -175 N
-P 2 0 1 0 -5 -200 5 -200 N
-P 2 0 1 0 0 -150 0 0 N
-P 2 0 1 0 50 -150 -50 -150 N
-X Earth_Protective 1 0 0 0 D 50 50 1 1 W N
-ENDDRAW
-ENDDEF
-#
 # power_GNDREF
 #
 DEF power_GNDREF #PWR 0 0 Y Y 1 F P

schematics/c3lingo-interpreter-unit.pro

@@ -1,4 +1,4 @@
-update=Monday, 12 October 2020 at 12:14:27
+update=Sunday, 01 November 2020 at 20:01:52
 last_client=kicad
 [general]
 version=1
@@ -12,3 +12,240 @@ NetFmtName=Pcbnew
 SpiceAjustPassiveValues=0
 LabSize=50
 ERC_TestSimilarLabels=1
+[pcbnew]
+version=1
+PageLayoutDescrFile=
+LastNetListRead=c3lingo-interpreter-unit.net
+CopperLayerCount=2
+BoardThickness=1.6
+AllowMicroVias=0
+AllowBlindVias=0
+RequireCourtyardDefinitions=0
+ProhibitOverlappingCourtyards=1
+MinTrackWidth=0.2
+MinViaDiameter=0.4
+MinViaDrill=0.3
+MinMicroViaDiameter=0.2
+MinMicroViaDrill=0.09999999999999999
+MinHoleToHole=0.25
+TrackWidth1=0.25
+TrackWidth2=0.25
+TrackWidth3=1
+ViaDiameter1=0.6
+ViaDrill1=0.3
+dPairWidth1=0.2
+dPairGap1=0.25
+dPairViaGap1=0.25
+SilkLineWidth=0.12
+SilkTextSizeV=1
+SilkTextSizeH=1
+SilkTextSizeThickness=0.15
+SilkTextItalic=0
+SilkTextUpright=1
+CopperLineWidth=0.2
+CopperTextSizeV=1.5
+CopperTextSizeH=1.5
+CopperTextThickness=0.3
+CopperTextItalic=0
+CopperTextUpright=1
+EdgeCutLineWidth=0.05
+CourtyardLineWidth=0.05
+OthersLineWidth=0.12
+OthersTextSizeV=1
+OthersTextSizeH=1
+OthersTextSizeThickness=0.15
+OthersTextItalic=0
+OthersTextUpright=1
+SolderMaskClearance=0
+SolderMaskMinWidth=0
+SolderPasteClearance=0
+SolderPasteRatio=-0
+[pcbnew/Layer.F.Cu]
+Name=F.Cu
+Type=0
+Enabled=1
+[pcbnew/Layer.In1.Cu]
+Name=In1.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In2.Cu]
+Name=In2.Cu
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+Enabled=0
+[pcbnew/Layer.In3.Cu]
+Name=In3.Cu
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+Enabled=0
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+Type=0
+Enabled=0
+[pcbnew/Layer.In5.Cu]
+Name=In5.Cu
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+Name=In6.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In7.Cu]
+Name=In7.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In8.Cu]
+Name=In8.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In9.Cu]
+Name=In9.Cu
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+[pcbnew/Layer.In10.Cu]
+Name=In10.Cu
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+Enabled=0
+[pcbnew/Layer.In11.Cu]
+Name=In11.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In12.Cu]
+Name=In12.Cu
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+Enabled=0
+[pcbnew/Layer.In13.Cu]
+Name=In13.Cu
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+Enabled=0
+[pcbnew/Layer.In14.Cu]
+Name=In14.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In15.Cu]
+Name=In15.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In16.Cu]
+Name=In16.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In17.Cu]
+Name=In17.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In18.Cu]
+Name=In18.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In19.Cu]
+Name=In19.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In20.Cu]
+Name=In20.Cu
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+[pcbnew/Layer.In21.Cu]
+Name=In21.Cu
+Type=0
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+Name=In22.Cu
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+Name=In23.Cu
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+Name=In28.Cu
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+Name=In29.Cu
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+Name=In30.Cu
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+Enabled=0
+[pcbnew/Layer.B.Cu]
+Name=B.Cu
+Type=0
+Enabled=1
+[pcbnew/Layer.B.Adhes]
+Enabled=1
+[pcbnew/Layer.F.Adhes]
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+Enabled=1
+[pcbnew/Layer.F.Paste]
+Enabled=1
+[pcbnew/Layer.B.SilkS]
+Enabled=1
+[pcbnew/Layer.F.SilkS]
+Enabled=1
+[pcbnew/Layer.B.Mask]
+Enabled=1
+[pcbnew/Layer.F.Mask]
+Enabled=1
+[pcbnew/Layer.Dwgs.User]
+Enabled=1
+[pcbnew/Layer.Cmts.User]
+Enabled=1
+[pcbnew/Layer.Eco1.User]
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+[pcbnew/Layer.Eco2.User]
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+[pcbnew/Layer.Edge.Cuts]
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+[pcbnew/Layer.Margin]
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+dPairViaGap=0.25
+[pcbnew/Netclasses/1]
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