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c3lingo-interpreter-unit
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Refine headphone mix requirements, fix signal flow

This commit is contained in:
Jannik Beyerstedt 2020-11-12 01:11:14 +01:00
parent 01f539128d
commit 1432d0e215
8 changed files with 3317 additions and 2666 deletions
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18
README.md
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@ -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.
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
TODO: Integrate the On-Air button with it's LEDs
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!
TODO: Check, if driving the two speakers in parallel leads to any issues (besides cutting the speaker impedance in half).
For the first draft, we're using one LM386 audio power amplifier even though it has a quite high minimal amplification of factor 20.
#### 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.

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59
schematics/mixer/c3lingo-interpreter-unit-cache.lib
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@ -134,6 +134,23 @@ X Pin_3 3 200 -100 150 L 50 50 1 1 P
ENDDRAW
ENDDEF
#
# Connector_TestPoint
#
DEF Connector_TestPoint TP 0 30 N N 1 F N
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
P 3 0 1 0 260 20 270 20 250 0 N
P 4 0 1 0 -250 -55 -270 -10 -230 -10 -250 -55 F
P 4 0 1 0 250 -55 230 -10 270 -10 250 -55 F
X 1 1 -400 -100 50 R 50 50 1 1 P
X 2 2 -250 100 100 D 50 50 1 1 P
X 3 3 -100 -100 50 L 50 50 1 1 P
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

5425
schematics/mixer/c3lingo-interpreter-unit.kicad_pcb
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481
schematics/mixer/c3lingo-interpreter-unit.sch
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@ -261,7 +261,7 @@ U 1 1 5F864500
P 3850 2000
F 0 "C6" V 4105 2000 50 0000 C CNN
F 1 "10uF" V 4014 2000 50 0000 C CNN
F 2 "Capacitor_THT:CP_Radial_D10.0mm_P5.00mm" H 3888 1850 50 0001 C CNN
F 2 "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm" H 3888 1850 50 0001 C CNN
F 3 "~" H 3850 2000 50 0001 C CNN
1 3850 2000
0 -1 -1 0
@ -600,7 +600,7 @@ P 7600 8400
F 0 "RV1" V 7485 8400 50 0000 C CNN
F 1 "100K" V 7394 8400 50 0000 C CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" H 7600 8400 50 0001 C CNN
F 3 "~" H 7600 8400 50 0001 C CNN
F 3 "TODO: Footprint no final!" H 7600 8400 50 0001 C CNN
1 7600 8400
0 -1 -1 0
$EndComp
@ -694,7 +694,7 @@ Wire Wire Line
8750 8500 8950 8500
Connection ~ 8950 8500
Wire Wire Line
8950 8500 9400 8500
8950 8500 9350 8500
$Comp
L Amplifier_Operational:LM358 U3
U 1 1 5FCC6AFD
@ -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
$Comp
L Device:R R12
@ -1026,7 +1026,7 @@ Wire Wire Line
Wire Wire Line
2300 5400 2300 5600
Wire Wire Line
1150 4800 1600 4800
1150 4800 1200 4800
Wire Wire Line
2000 5200 2300 5200
Connection ~ 2000 5200
@ -1036,7 +1036,7 @@ Connection ~ 2300 5200
Text GLabel 4350 5000 2 50 Output ~ 0
MicSum
Wire Wire Line
4350 5000 4000 5000
4350 5000 4300 5000
Wire Wire Line
4000 5300 3900 5300
$Comp
@ -1123,8 +1123,8 @@ F 3 "" H 11150 1150 50 0001 C CNN
3 11150 1150
0 1 1 0
$EndComp
Text GLabel 8350 1350 0 50 Input ~ 0
MicSum
Text GLabel 8350 1600 0 50 Input ~ 0
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
$Comp
L Device:R R9
U 1 1 5FFF6743
P 8950 2350
F 0 "R9" V 8743 2350 50 0000 C CNN
F 1 "22K" V 8834 2350 50 0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 8880 2350 50 0001 C CNN
F 3 "~" H 8950 2350 50 0001 C CNN
1 8950 2350
P 10050 1600
F 0 "R9" V 9843 1600 50 0000 C CNN
F 1 "22K" V 9934 1600 50 0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 9980 1600 50 0001 C CNN
F 3 "~" H 10050 1600 50 0001 C CNN
1 10050 1600
0 1 1 0
$EndComp
$Comp
L Device:R_POT R3
L Device:R_POT RV13
U 1 1 5FFF6755
P 10050 1600
F 0 "R3" V 9935 1600 50 0000 C CNN
F 1 "22K" V 9844 1600 50 0000 C CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" V 9980 1600 50 0001 C CNN
F 3 "~" H 10050 1600 50 0001 C CNN
1 10050 1600
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P 8950 1100
F 0 "RV13" H 8880 1054 50 0000 R CNN
F 1 "22K" H 8880 1145 50 0000 R CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" V 8880 1100 50 0001 C CNN
F 3 "TODO: Footprint no final!" H 8950 1100 50 0001 C CNN
1 8950 1100
1 0 0 1
$EndComp
$Comp
L Device:C C3
@ -1199,12 +1199,10 @@ F 3 "~" H 10950 2300 50 0001 C CNN
1 10950 2300
0 1 1 0
$EndComp
Text Notes 8700 3000 0 50 ~ 10
Text Notes 9350 3000 0 50 ~ 10
Summing Module\nGain: -inf to 0 dB
Wire Wire Line
9100 1600 9200 1600
Wire Wire Line
9200 2350 9100 2350
9100 1850 9200 1850
Wire Wire Line
9500 1600 9900 1600
$Comp
@ -1235,54 +1233,30 @@ Wire Wire Line
11200 2000 11200 2300
Wire Wire Line
11200 2300 11100 2300
Wire Wire Line
9200 1600 9200 2200
Wire Wire Line
4000 5000 4000 5300
Wire Wire Line
9200 2200 9200 2350
Connection ~ 9200 2200
Wire Wire Line
9200 2200 9500 2200
Wire Wire Line
10200 2300 10300 2300
Wire Wire Line
10050 1450 10050 1400
Wire Wire Line
10050 1400 10200 1400
Wire Wire Line
9500 1600 9500 2200
Wire Wire Line
9500 2200 9600 2200
Wire Wire Line
10300 1400 10300 2300
Connection ~ 10300 2300
Wire Wire Line
10300 2300 10400 2300
Wire Wire Line
9900 1250 10200 1250
Wire Wire Line
10200 1250 10200 1400
Connection ~ 10200 1400
Wire Wire Line
10200 1400 10300 1400
$Comp
L Device:R_POT R4
L Device:R_POT RV14
U 1 1 6016D9DA
P 8950 1600
F 0 "R4" H 8881 1554 50 0000 R CNN
F 1 "22K" H 8881 1645 50 0000 R CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" V 8880 1600 50 0001 C CNN
F 3 "~" H 8950 1600 50 0001 C CNN
1 8950 1600
P 8950 1850
F 0 "RV14" H 8881 1804 50 0000 R CNN
F 1 "22K" H 8881 1895 50 0000 R CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" V 8880 1850 50 0001 C CNN
F 3 "TODO: Footprint no final!" H 8950 1850 50 0001 C CNN
1 8950 1850
1 0 0 1
$EndComp
Wire Wire Line
8350 2350 8800 2350
8950 1600 8950 1700
Wire Wire Line
8950 1350 8950 1450
Wire Wire Line
8350 1350 8950 1350
8350 1600 8400 1600
Connection ~ 9500 2200
Wire Wire Line
1050 8150 1200 8150
@ -1361,15 +1335,12 @@ Wire Wire Line
Wire Wire Line
15600 9100 15600 9200
NoConn ~ 7750 8400
NoConn ~ 1600 5150
NoConn ~ 1600 5500
NoConn ~ 10200 1600
NoConn ~ 2750 2300
NoConn ~ 2850 2300
NoConn ~ 2750 1700
Wire Wire Line
15100 9100 15600 9100
Text Notes 8150 1200 0 50 ~ 0
Text Notes 8150 750 0 50 ~ 0
TODO: Try 10K or 100K poti\nwith matching feedback R\n(Keep LP filter in mind!)
$Comp
L JBeyerstedt-Library:DRV134PA U5
@ -1492,7 +1463,7 @@ Wire Wire Line
14900 4800 15300 4800
Connection ~ 14450 4650
Wire Wire Line
11650 4500 12750 4500
11650 4500 11700 4500
Wire Wire Line
12550 4950 12650 4950
Wire Wire Line
@ -1728,13 +1699,13 @@ Wire Wire Line
Wire Wire Line
5450 1550 5350 1550
$Comp
L Device:R_POT R27
L Device:R_POT RV11
U 1 1 60B0D55A
P 6000 1550
F 0 "R27" V 5885 1550 50 0000 C CNN
F 0 "RV11" V 5885 1550 50 0000 C CNN
F 1 "25K" V 5794 1550 50 0000 C CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" V 5930 1550 50 0001 C CNN
F 3 "~" H 6000 1550 50 0001 C CNN
F 3 "TODO: Footprint no final!" H 6000 1550 50 0001 C CNN
1 6000 1550
0 -1 -1 0
$EndComp
@ -1765,12 +1736,12 @@ TODO: On-Air button LEDs\n(actually one rd, one gn,\nwith common anode)
$Comp
L power:GNDREF #PWR036
U 1 1 5FF79FFE
P 8950 1750
F 0 "#PWR036" H 8950 1500 50 0001 C CNN
F 1 "GNDREF" H 8955 1577 50 0000 C CNN
F 2 "" H 8950 1750 50 0001 C CNN
F 3 "" H 8950 1750 50 0001 C CNN
1 8950 1750
P 8950 2000
F 0 "#PWR036" H 8950 1750 50 0001 C CNN
F 1 "GNDREF" H 8955 1827 50 0000 C CNN
F 2 "" H 8950 2000 50 0001 C CNN
F 3 "" H 8950 2000 50 0001 C CNN
1 8950 2000
1 0 0 -1
$EndComp
Wire Wire Line
@ -1904,7 +1875,7 @@ Connection ~ 700 2250
Wire Wire Line
600 2250 600 1900
Text Notes 3850 3000 0 50 ~ 0
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
TODO: Check LP Filter Characteristic\n(see input module circuit)
Wire Wire Line
@ -1965,13 +1936,13 @@ F 3 "" H 13200 2500 50 0001 C CNN
1 0 0 -1
$EndComp
$Comp
L Device:R_POT RV2
L Device:R_POT RV19
U 1 1 5FBA2B4E
P 12500 2250
F 0 "RV2" H 12431 2204 50 0000 R CNN
F 0 "RV19" H 12431 2204 50 0000 R CNN
F 1 "25K" H 12431 2295 50 0000 R CNN
F 2 "Potentiometer_THT:Potentiometer_Vishay_148-149_Single_Horizontal" H 12500 2250 50 0001 C CNN
F 3 "~" H 12500 2250 50 0001 C CNN
F 3 "TODO: Footprint no final!" H 12500 2250 50 0001 C CNN
1 12500 2250
1 0 0 1
$EndComp
@ -2028,18 +1999,16 @@ F 3 "~" H 13450 1550 50 0001 C CNN
0 -1 -1 0
$EndComp
Wire Wire Line
7200 2000 7000 2000
7200 2000 7150 2000
Wire Wire Line
7000 2000 7000 2250
Wire Wire Line
7000 2250 6250 2250
Connection ~ 6250 2250
$Comp
L Device:R R24
U 1 1 5FE4A41D
P 12500 1850
F 0 "R24" H 12430 1896 50 0000 R CNN
F 1 "R" H 12430 1805 50 0000 R CNN
F 1 "82K" H 12430 1805 50 0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 12430 1850 50 0001 C CNN
F 3 "~" H 12500 1850 50 0001 C CNN
1 12500 1850
@ -2123,7 +2092,7 @@ P 13300 2000
F 0 "U7" H 13644 2046 50 0000 L CNN
F 1 "LM386N-4" H 13644 1955 50 0000 L CNN
F 2 "Package_DIP:DIP-8_W7.62mm_Socket_LongPads" H 13400 2100 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm386.pdf" H 13500 2200 50 0001 C CNN
F 3 "https://www.ti.com/lit/ds/symlink/lm386.pdf" H 13500 2200 50 0001 C CNN
1 13300 2000
1 0 0 -1
$EndComp
@ -2175,4 +2144,352 @@ Wire Wire Line
Connection ~ 15100 9200
NoConn ~ 13300 2300
NoConn ~ 13400 2300
Wire Wire Line
10200 2300 10300 2300
Wire Wire Line
9900 1250 10300 1250
Wire Wire Line
10300 1250 10300 1600
Connection ~ 10300 2300
Wire Wire Line
10300 2300 10400 2300
Wire Wire Line
10200 1600 10300 1600
Connection ~ 10300 1600
Wire Wire Line
10300 1600 10300 2300
$Comp
L power:GNDREF #PWR0117
U 1 1 5FCA62EC
P 8950 1250
F 0 "#PWR0117" H 8950 1000 50 0001 C CNN
F 1 "GNDREF" H 8955 1077 50 0000 C CNN
F 2 "" H 8950 1250 50 0001 C CNN
F 3 "" H 8950 1250 50 0001 C CNN
1 8950 1250
1 0 0 -1
$EndComp
Wire Wire Line
8950 850 8950 950
Wire Wire Line
8350 850 8400 850
Wire Wire Line
9100 1100 9200 1100
$Comp
L power:GNDREF #PWR0118
U 1 1 5FD303BF
P 9300 3300
F 0 "#PWR0118" H 9300 3050 50 0001 C CNN
F 1 "GNDREF" H 9305 3127 50 0000 C CNN
F 2 "" H 9300 3300 50 0001 C CNN
F 3 "" H 9300 3300 50 0001 C CNN
1 9300 3300
1 0 0 -1
$EndComp
$Comp
L Device:R_POT_Dual RV15
U 1 1 5FD69197
P 9050 2850
F 0 "RV15" V 9096 2662 50 0000 R CNN
F 1 "22K" V 9005 2662 50 0000 R CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical" H 9300 2775 50 0001 C CNN
F 3 "TODO: Footprint no final!" H 9300 2775 50 0001 C CNN
1 9050 2850
0 1 -1 0
$EndComp
Wire Wire Line
8950 2850 8950 2950
Wire Wire Line
8950 2350 8950 2450
Wire Wire Line
9200 2600 9150 2600
Wire Wire Line
9200 2200 9200 2600
Wire Wire Line
9200 3100 9150 3100
Connection ~ 9200 1850
Connection ~ 9200 2600
Wire Wire Line
9200 1850 9200 2200
Wire Wire Line
9200 2600 9200 3100
Wire Wire Line
9200 1100 9200 1850
Wire Wire Line
8950 2750 9300 2750
Wire Wire Line
9300 2750 9300 3250
Wire Wire Line
9300 3250 9300 3300
Connection ~ 9300 3250
Wire Wire Line
8950 3250 9300 3250
Text Notes 8150 2350 0 50 ~ 0
Mic2
Text Notes 8150 2850 0 50 ~ 0
Mic3
$Comp
L Connector:TestPoint TP1
U 1 1 5FAE2168
P 7150 2000
F 0 "TP1" H 7150 2325 50 0000 C CNN
F 1 "Mic1" H 7150 2234 50 0000 C CNN
F 2 "TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm" H 7350 2000 50 0001 C CNN
F 3 "~" H 7350 2000 50 0001 C CNN
1 7150 2000
1 0 0 -1
$EndComp
Wire Wire Line
6250 2250 7000 2250
$Comp
L Connector:Conn_01x03_Male J6
U 1 1 5FB363A9
P 14900 7250
F 0 "J6" H 15008 7531 50 0000 C CNN
F 1 "PowerSupply" H 15008 7440 50 0000 C CNN
F 2 "TerminalBlock_MetzConnect:TerminalBlock_MetzConnect_Type073_RT02603HBLU_1x03_P5.08mm_Horizontal" H 14900 7250 50 0001 C CNN
F 3 "" H 14900 7250 50 0001 C CNN
1 14900 7250
1 0 0 -1
$EndComp
$Comp
L power:GNDREF #PWR0119
U 1 1 5FB363AF
P 15600 7350
F 0 "#PWR0119" H 15600 7100 50 0001 C CNN
F 1 "GNDREF" H 15605 7177 50 0000 C CNN
F 2 "" H 15600 7350 50 0001 C CNN
F 3 "" H 15600 7350 50 0001 C CNN
1 15600 7350
1 0 0 -1
$EndComp
$Comp
L power:+15V #PWR0120
U 1 1 5FB363B5
P 15300 7050
F 0 "#PWR0120" H 15300 6900 50 0001 C CNN
F 1 "+15V" H 15315 7223 50 0000 C CNN
F 2 "" H 15300 7050 50 0001 C CNN
F 3 "" H 15300 7050 50 0001 C CNN
1 15300 7050
1 0 0 -1
$EndComp
$Comp
L power:-15V #PWR0121
U 1 1 5FB363BB
P 15300 7450
F 0 "#PWR0121" H 15300 7550 50 0001 C CNN
F 1 "-15V" H 15315 7623 50 0000 C CNN
F 2 "" H 15300 7450 50 0001 C CNN
F 3 "" H 15300 7450 50 0001 C CNN
1 15300 7450
-1 0 0 1
$EndComp
Wire Wire Line
15100 7350 15300 7350
Wire Wire Line
15300 7350 15300 7450
Wire Wire Line
15100 7150 15300 7150
Wire Wire Line
15300 7150 15300 7050
Wire Wire Line
15600 7250 15600 7350
Wire Wire Line
15100 7250 15600 7250
$Comp
L Connector:Conn_01x03_Male J7
U 1 1 5FBD1CA9
P 14900 8150
F 0 "J7" H 15008 8431 50 0000 C CNN
F 1 "PowerSupply" H 15008 8340 50 0000 C CNN
F 2 "TerminalBlock_MetzConnect:TerminalBlock_MetzConnect_Type073_RT02603HBLU_1x03_P5.08mm_Horizontal" H 14900 8150 50 0001 C CNN
F 3 "" H 14900 8150 50 0001 C CNN
1 14900 8150
1 0 0 -1
$EndComp
$Comp
L power:GNDREF #PWR0122
U 1 1 5FBD1CAF
P 15600 8250
F 0 "#PWR0122" H 15600 8000 50 0001 C CNN
F 1 "GNDREF" H 15605 8077 50 0000 C CNN
F 2 "" H 15600 8250 50 0001 C CNN
F 3 "" H 15600 8250 50 0001 C CNN
1 15600 8250
1 0 0 -1
$EndComp
$Comp
L power:+15V #PWR0123
U 1 1 5FBD1CB5
P 15300 7950
F 0 "#PWR0123" H 15300 7800 50 0001 C CNN
F 1 "+15V" H 15315 8123 50 0000 C CNN
F 2 "" H 15300 7950 50 0001 C CNN
F 3 "" H 15300 7950 50 0001 C CNN
1 15300 7950
1 0 0 -1
$EndComp
$Comp
L power:-15V #PWR0124
U 1 1 5FBD1CBB
P 15300 8350
F 0 "#PWR0124" H 15300 8450 50 0001 C CNN
F 1 "-15V" H 15315 8523 50 0000 C CNN
F 2 "" H 15300 8350 50 0001 C CNN
F 3 "" H 15300 8350 50 0001 C CNN
1 15300 8350
-1 0 0 1
$EndComp
Wire Wire Line
15100 8250 15300 8250
Wire Wire Line
15300 8250 15300 8350
Wire Wire Line
15100 8050 15300 8050
Wire Wire Line
15300 8050 15300 7950
Wire Wire Line
15600 8150 15600 8250
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