added buffer amplifier

1 files changed, 216 insertions, 177 deletions

diff --git a/potentiosynth/driver-pcb/kicad/active-feedback.sch-bak b/potentiosynth/driver-pcb/kicad/active-feedback.sch-bak
index 0dc6fca..fa0da96 100644
--- a/potentiosynth/driver-pcb/kicad/active-feedback.sch-bak
+++ b/potentiosynth/driver-pcb/kicad/active-feedback.sch-bak
@@ -3,7 +3,7 @@ EELAYER 30 0
 EELAYER END
 $Descr USLetter 11000 8500
 encoding utf-8
-Sheet 3 9
+Sheet 6 9
 Title "potentiosynth"
 Date "2021-05-07"
 Rev "A"
@@ -13,36 +13,14 @@ Comment2 "Department of Chemistry"
 Comment3 "Blaise Thompson"
 Comment4 "blaise.thompson@wisc.edu"
 $EndDescr
-Text HLabel 6850 3800 2    50   BiDi ~ 0
+Text HLabel 3600 4400 2    50   BiDi ~ 0
 COUNTER
-Text HLabel 6850 4400 2    50   BiDi ~ 0
+Text HLabel 3600 4700 2    50   BiDi ~ 0
 REFERENCE
 $Comp
 L power:GND #PWR?
-U 1 1 5E5D6B75
-P 5400 4100
-AR Path="/5E5D6B75" Ref="#PWR?"  Part="1" 
-AR Path="/5E39B760/5E5D6B75" Ref="#PWR0112"  Part="1" 
-AR Path="/5E3EAB60/5E5D6B75" Ref="#PWR0119"  Part="1" 
-AR Path="/5E4039E6/5E5D6B75" Ref="#PWR0125"  Part="1" 
-AR Path="/5E4039EC/5E5D6B75" Ref="#PWR0131"  Part="1" 
-AR Path="/5E4039F2/5E5D6B75" Ref="#PWR0137"  Part="1" 
-AR Path="/5E4039E0/5E5D6B75" Ref="#PWR0143"  Part="1" 
-AR Path="/5E3EC44B/5E5D6B75" Ref="#PWR0149"  Part="1" 
-AR Path="/5E3ED540/5E5D6B75" Ref="#PWR0155"  Part="1" 
-F 0 "#PWR0125" H 5400 3850 50  0001 C CNN
-F 1 "GND" H 5405 3927 50  0000 C CNN
-F 2 "" H 5400 4100 50  0001 C CNN
-F 3 "" H 5400 4100 50  0001 C CNN
-	1    5400 4100
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	4600 2800 4600 3500
-$Comp
-L power:GND #PWR?
 U 1 1 5E5D6BC0
-P 5900 3300
+P 8500 4600
 AR Path="/5E5D6BC0" Ref="#PWR?"  Part="1" 
 AR Path="/5E39B760/5E5D6BC0" Ref="#PWR0115"  Part="1" 
 AR Path="/5E3EAB60/5E5D6BC0" Ref="#PWR0122"  Part="1" 
@@ -52,17 +30,17 @@ AR Path="/5E4039F2/5E5D6BC0" Ref="#PWR0140"  Part="1"
 AR Path="/5E4039E0/5E5D6BC0" Ref="#PWR0146"  Part="1" 
 AR Path="/5E3EC44B/5E5D6BC0" Ref="#PWR0152"  Part="1" 
 AR Path="/5E3ED540/5E5D6BC0" Ref="#PWR0158"  Part="1" 
-F 0 "#PWR0128" H 5900 3050 50  0001 C CNN
-F 1 "GND" H 5905 3127 50  0000 C CNN
-F 2 "" H 5900 3300 50  0001 C CNN
-F 3 "" H 5900 3300 50  0001 C CNN
-	1    5900 3300
+F 0 "#PWR0115" H 8500 4350 50  0001 C CNN
+F 1 "GND" H 8505 4427 50  0000 C CNN
+F 2 "" H 8500 4600 50  0001 C CNN
+F 3 "" H 8500 4600 50  0001 C CNN
+	1    8500 4600
 	1    0    0    -1  
 $EndComp
 $Comp
 L Device:R_US R-?
 U 1 1 5E5D6BC6
-P 4050 3500
+P 6750 5000
 AR Path="/5E5D6BC6" Ref="R-?"  Part="1" 
 AR Path="/5E39B760/5E5D6BC6" Ref="R-1"  Part="1" 
 AR Path="/5E3EAB60/5E5D6BC6" Ref="R-2"  Part="1" 
@@ -72,19 +50,17 @@ AR Path="/5E4039F2/5E5D6BC6" Ref="R-8"  Part="1"
 AR Path="/5E4039E0/5E5D6BC6" Ref="R-5"  Part="1" 
 AR Path="/5E3EC44B/5E5D6BC6" Ref="R-3"  Part="1" 
 AR Path="/5E3ED540/5E5D6BC6" Ref="R-4"  Part="1" 
-F 0 "R-8" V 4150 3400 50  0000 C CNN
-F 1 "1k" V 4150 3600 50  0000 C CNN
-F 2 "Resistor_SMD:R_1206_3216Metric" V 4090 3490 50  0001 C CNN
-F 3 "~" H 4050 3500 50  0001 C CNN
-	1    4050 3500
+F 0 "R-1" V 6850 4900 50  0000 C CNN
+F 1 "1k" V 6850 5100 50  0000 C CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 6790 4990 50  0001 C CNN
+F 3 "~" H 6750 5000 50  0001 C CNN
+	1    6750 5000
 	0    1    -1   0   
 $EndComp
-Wire Wire Line
-	4600 3900 5000 3900
 $Comp
 L power:GND #PWR?
 U 1 1 5E66C0EF
-P 4300 3300
+P 7000 4600
 AR Path="/5E66C0EF" Ref="#PWR?"  Part="1" 
 AR Path="/5E39B760/5E66C0EF" Ref="#PWR0117"  Part="1" 
 AR Path="/5E3EAB60/5E66C0EF" Ref="#PWR0123"  Part="1" 
@@ -94,17 +70,17 @@ AR Path="/5E4039F2/5E66C0EF" Ref="#PWR0141"  Part="1"
 AR Path="/5E4039E0/5E66C0EF" Ref="#PWR0147"  Part="1" 
 AR Path="/5E3EC44B/5E66C0EF" Ref="#PWR0153"  Part="1" 
 AR Path="/5E3ED540/5E66C0EF" Ref="#PWR0159"  Part="1" 
-F 0 "#PWR0129" H 4300 3050 50  0001 C CNN
-F 1 "GND" H 4400 3200 50  0000 C CNN
-F 2 "" H 4300 3300 50  0001 C CNN
-F 3 "" H 4300 3300 50  0001 C CNN
-	1    4300 3300
+F 0 "#PWR0117" H 7000 4350 50  0001 C CNN
+F 1 "GND" H 7100 4500 50  0000 C CNN
+F 2 "" H 7000 4600 50  0001 C CNN
+F 3 "" H 7000 4600 50  0001 C CNN
+	1    7000 4600
 	1    0    0    -1  
 $EndComp
 $Comp
 L Device:R_US R+?
 U 1 1 5E5D6BCC
-P 4050 3000
+P 6750 4300
 AR Path="/5E5D6BCC" Ref="R+?"  Part="1" 
 AR Path="/5E39B760/5E5D6BCC" Ref="R+1"  Part="1" 
 AR Path="/5E3EAB60/5E5D6BCC" Ref="R+2"  Part="1" 
@@ -114,21 +90,19 @@ AR Path="/5E4039F2/5E5D6BCC" Ref="R+8"  Part="1"
 AR Path="/5E4039E0/5E5D6BCC" Ref="R+5"  Part="1" 
 AR Path="/5E3EC44B/5E5D6BCC" Ref="R+3"  Part="1" 
 AR Path="/5E3ED540/5E5D6BCC" Ref="R+4"  Part="1" 
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-F 2 "Resistor_SMD:R_1206_3216Metric" V 4090 2990 50  0001 C CNN
-F 3 "~" H 4050 3000 50  0001 C CNN
-	1    4050 3000
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+F 1 "1k" V 6650 4200 50  0000 C CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 6790 4290 50  0001 C CNN
+F 3 "~" H 6750 4300 50  0001 C CNN
+	1    6750 4300
 	0    -1   1    0   
 $EndComp
-Text Notes 6300 2800 0    50   ~ 0
-DIFFERENTIAL AMPLIFIER\nTRANSISTOR WILL CLOSE WHEN\nVOLTAGE DIFF.  >  20 mV 
-Wire Wire Line
-	5900 2900 6850 2900
+Text Notes 7950 5150 0    50   ~ 0
+TRANSISTOR WILL CLOSE WHEN\nVOLTAGE DIFF.  >  20 mV 
 $Comp
 L Device:R_US RF?
 U 1 1 5E5D6BB9
-P 5000 2800
+P 7800 4000
 AR Path="/5E5D6BB9" Ref="RF?"  Part="1" 
 AR Path="/5E39B760/5E5D6BB9" Ref="RF1"  Part="1" 
 AR Path="/5E3EAB60/5E5D6BB9" Ref="RF2"  Part="1" 
@@ -138,17 +112,17 @@ AR Path="/5E4039F2/5E5D6BB9" Ref="RF8"  Part="1"
 AR Path="/5E4039E0/5E5D6BB9" Ref="RF5"  Part="1" 
 AR Path="/5E3EC44B/5E5D6BB9" Ref="RF3"  Part="1" 
 AR Path="/5E3ED540/5E5D6BB9" Ref="RF4"  Part="1" 
-F 0 "RF8" V 4900 2900 50  0000 C CNN
-F 1 "100k" V 4900 2700 50  0000 C CNN
-F 2 "Resistor_SMD:R_1206_3216Metric" V 5040 2790 50  0001 C CNN
-F 3 "~" H 5000 2800 50  0001 C CNN
-	1    5000 2800
+F 0 "RF1" V 7700 4100 50  0000 C CNN
+F 1 "100k" V 7700 3900 50  0000 C CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 7840 3990 50  0001 C CNN
+F 3 "~" H 7800 4000 50  0001 C CNN
+	1    7800 4000
 	0    -1   1    0   
 $EndComp
 $Comp
 L Device:R_US RG?
 U 1 1 5E66B3AD
-P 4300 3150
+P 7000 4450
 AR Path="/5E66B3AD" Ref="RG?"  Part="1" 
 AR Path="/5E39B760/5E66B3AD" Ref="RG1"  Part="1" 
 AR Path="/5E3EAB60/5E66B3AD" Ref="RG2"  Part="1" 
@@ -158,41 +132,19 @@ AR Path="/5E4039F2/5E66B3AD" Ref="RG8"  Part="1"
 AR Path="/5E4039E0/5E66B3AD" Ref="RG5"  Part="1" 
 AR Path="/5E3EC44B/5E66B3AD" Ref="RG3"  Part="1" 
 AR Path="/5E3ED540/5E66B3AD" Ref="RG4"  Part="1" 
-F 0 "RG8" V 4400 3150 50  0000 C CNN
-F 1 "100k" V 4186 3150 50  0000 C CNN
-F 2 "Resistor_SMD:R_1206_3216Metric" V 4340 3140 50  0001 C CNN
-F 3 "~" H 4300 3150 50  0001 C CNN
-	1    4300 3150
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+F 2 "Resistor_SMD:R_1206_3216Metric" V 7040 4440 50  0001 C CNN
+F 3 "~" H 7000 4450 50  0001 C CNN
+	1    7000 4450
 	-1   0    0    -1  
 $EndComp
-Text HLabel 6850 2900 2    50   Output ~ 0
+Text HLabel 8750 4000 2    50   Output ~ 0
 ERROR
 $Comp
-L power:+15V #PWR?
-U 1 1 5E5D6B6F
-P 5400 3100
-AR Path="/5E5D6B6F" Ref="#PWR?"  Part="1" 
-AR Path="/5E39B760/5E5D6B6F" Ref="#PWR0111"  Part="1" 
-AR Path="/5E3EAB60/5E5D6B6F" Ref="#PWR0118"  Part="1" 
-AR Path="/5E4039E6/5E5D6B6F" Ref="#PWR0124"  Part="1" 
-AR Path="/5E4039EC/5E5D6B6F" Ref="#PWR0130"  Part="1" 
-AR Path="/5E4039F2/5E5D6B6F" Ref="#PWR0136"  Part="1" 
-AR Path="/5E4039E0/5E5D6B6F" Ref="#PWR0142"  Part="1" 
-AR Path="/5E3EC44B/5E5D6B6F" Ref="#PWR0148"  Part="1" 
-AR Path="/5E3ED540/5E5D6B6F" Ref="#PWR0154"  Part="1" 
-F 0 "#PWR0124" H 5400 2950 50  0001 C CNN
-F 1 "+15V" H 5415 3273 50  0000 C CNN
-F 2 "" H 5400 3100 50  0001 C CNN
-F 3 "" H 5400 3100 50  0001 C CNN
-	1    5400 3100
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	4600 4400 6850 4400
-$Comp
 L Device:R_POT_US RV1
 U 1 1 6096BA3A
-P 2850 3500
+P 2000 4300
 AR Path="/5E39B760/6096BA3A" Ref="RV1"  Part="1" 
 AR Path="/5E3EAB60/6096BA3A" Ref="RV2"  Part="1" 
 AR Path="/5E3EC44B/6096BA3A" Ref="RV3"  Part="1" 
@@ -201,17 +153,17 @@ AR Path="/5E4039E0/6096BA3A" Ref="RV5"  Part="1"
 AR Path="/5E4039E6/6096BA3A" Ref="RV6"  Part="1" 
 AR Path="/5E4039EC/6096BA3A" Ref="RV7"  Part="1" 
 AR Path="/5E4039F2/6096BA3A" Ref="RV8"  Part="1" 
-F 0 "RV8" H 2783 3546 50  0000 R CNN
-F 1 "R_POT_US" H 2783 3455 50  0000 R CNN
-F 2 "Potentiometer_THT:Potentiometer_Bourns_3296X_Horizontal" H 2850 3500 50  0001 C CNN
-F 3 "~" H 2850 3500 50  0001 C CNN
-	1    2850 3500
+F 0 "RV1" H 1933 4346 50  0000 R CNN
+F 1 "R_POT_US" H 1933 4255 50  0000 R CNN
+F 2 "Potentiometer_THT:Potentiometer_Bourns_3296X_Horizontal" H 2000 4300 50  0001 C CNN
+F 3 "~" H 2000 4300 50  0001 C CNN
+	1    2000 4300
 	1    0    0    -1  
 $EndComp
 $Comp
 L power:GND #PWR0132
 U 1 1 6096D142
-P 2850 3650
+P 2000 4450
 AR Path="/5E39B760/6096D142" Ref="#PWR0132"  Part="1" 
 AR Path="/5E3EAB60/6096D142" Ref="#PWR0126"  Part="1" 
 AR Path="/5E3EC44B/6096D142" Ref="#PWR0138"  Part="1" 
@@ -220,17 +172,17 @@ AR Path="/5E4039E0/6096D142" Ref="#PWR0144"  Part="1"
 AR Path="/5E4039E6/6096D142" Ref="#PWR0150"  Part="1" 
 AR Path="/5E4039EC/6096D142" Ref="#PWR0106"  Part="1" 
 AR Path="/5E4039F2/6096D142" Ref="#PWR0113"  Part="1" 
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-F 1 "GND" H 2855 3477 50  0000 C CNN
-F 2 "" H 2850 3650 50  0001 C CNN
-F 3 "" H 2850 3650 50  0001 C CNN
-	1    2850 3650
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+F 1 "GND" H 2005 4277 50  0000 C CNN
+F 2 "" H 2000 4450 50  0001 C CNN
+F 3 "" H 2000 4450 50  0001 C CNN
+	1    2000 4450
 	1    0    0    -1  
 $EndComp
 $Comp
 L power:+15V #PWR0133
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@@ -239,102 +191,189 @@ AR Path="/5E4039E0/6096D768" Ref="#PWR0145"  Part="1"
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 AR Path="/5E4039EC/6096D768" Ref="#PWR0109"  Part="1" 
 AR Path="/5E4039F2/6096D768" Ref="#PWR0114"  Part="1" 
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-F 2 "" H 2850 3350 50  0001 C CNN
-F 3 "" H 2850 3350 50  0001 C CNN
-	1    2850 3350
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+F 1 "+15V" H 2015 4323 50  0000 C CNN
+F 2 "" H 2000 4150 50  0001 C CNN
+F 3 "" H 2000 4150 50  0001 C CNN
+	1    2000 4150
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	5600 3800 6850 3800
-Wire Wire Line
-	4600 3900 4600 4400
+	7000 4300 6900 4300
+$Comp
+L Device:Q_NMOS_GSD QE1
+U 1 1 609CA423
+P 8400 4400
+AR Path="/5E39B760/609CA423" Ref="QE1"  Part="1" 
+AR Path="/5E3EAB60/609CA423" Ref="QE2"  Part="1" 
+AR Path="/5E3EC44B/609CA423" Ref="QE3"  Part="1" 
+AR Path="/5E3ED540/609CA423" Ref="QE4"  Part="1" 
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+AR Path="/5E4039E6/609CA423" Ref="QE6"  Part="1" 
+AR Path="/5E4039EC/609CA423" Ref="QE7"  Part="1" 
+AR Path="/5E4039F2/609CA423" Ref="QE8"  Part="1" 
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+F 3 "~" H 8400 4400 50  0001 C CNN
+	1    8400 4400
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:Opamp_Quad_Generic U1
+U 2 1 60EAC4C5
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+F 0 "U1" H 7800 4050 50  0000 C CNN
+F 1 "TLV9154IPWR" H 7800 4150 50  0000 C CNN
+F 2 "" H 7800 4400 50  0001 C CNN
+F 3 "~" H 7800 4400 50  0001 C CNN
+	2    7800 4400
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:Opamp_Quad_Generic U1
+U 3 1 60EAD1D9
+P 5300 4400
+F 0 "U1" H 5300 4767 50  0000 C CNN
+F 1 "TLV9154IPWR" H 5300 4676 50  0000 C CNN
+F 2 "" H 5300 4400 50  0001 C CNN
+F 3 "~" H 5300 4400 50  0001 C CNN
+	3    5300 4400
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:Opamp_Quad_Generic U1
+U 4 1 60EAED48
+P 3300 4400
+F 0 "U1" H 3300 4767 50  0000 C CNN
+F 1 "TLV9154IPWR" H 3300 4676 50  0000 C CNN
+F 2 "" H 3300 4400 50  0001 C CNN
+F 3 "~" H 3300 4400 50  0001 C CNN
+	4    3300 4400
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:Opamp_Quad_Generic U1
+U 5 1 60EB0CAF
+P 2100 6250
+F 0 "U1" H 2058 6296 50  0000 L CNN
+F 1 "TLV9154IPWR" H 2058 6205 50  0000 L CNN
+F 2 "" H 2100 6250 50  0001 C CNN
+F 3 "~" H 2100 6250 50  0001 C CNN
+	5    2100 6250
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 60EBDE29
+P 2000 6550
+F 0 "#PWR?" H 2000 6300 50  0001 C CNN
+F 1 "GND" H 2005 6377 50  0000 C CNN
+F 2 "" H 2000 6550 50  0001 C CNN
+F 3 "" H 2000 6550 50  0001 C CNN
+	1    2000 6550
+	1    0    0    -1  
+$EndComp
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+	3000 4500 2900 4500
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+	2900 4500 2900 4700
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+	2750 3750 2750 5250
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-Wire Wire Line
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+Wire Notes Line
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+	3600 4700 2900 4700
+Connection ~ 2900 4700
 Wire Wire Line
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-Connection ~ 3750 3500
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 Wire Wire Line
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 Wire Wire Line
-	4200 3500 4600 3500
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
-	4300 3000 4500 3000
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 Wire Wire Line
-	4500 3000 4500 3300
+	4900 4700 5700 4700
 Wire Wire Line
-	4500 3300 5000 3300
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-Connection ~ 4600 3500
+	5700 4400 5600 4400
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-	4600 3500 5000 3500
+	8200 4400 8150 4400
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+Text Notes 4800 3850 0    50   ~ 0
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+	5700 4400 5700 4700
+Connection ~ 7000 4300
 Wire Wire Line
-	4850 2800 4600 2800
+	5700 5000 5700 4700
+Connection ~ 5700 4700
 Wire Notes Line
-	7500 2500 7500 4700
+	4750 5250 6000 5250
 Wire Notes Line
-	7500 4700 3500 4700
+	6000 5250 6000 3750
 Wire Notes Line
-	3500 2500 3500 4700
-$Comp
-L TLV9152IDR:TLV9152IDR U1
-U 1 1 6096020C
-P 5000 3600
-AR Path="/5E39B760/6096020C" Ref="U1"  Part="1" 
-AR Path="/5E3EAB60/6096020C" Ref="U2"  Part="1" 
-AR Path="/5E3EC44B/6096020C" Ref="U3"  Part="1" 
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-AR Path="/5E4039E6/6096020C" Ref="U6"  Part="1" 
-AR Path="/5E4039EC/6096020C" Ref="U7"  Part="1" 
-AR Path="/5E4039F2/6096020C" Ref="U8"  Part="1" 
-F 0 "U8" H 5250 4150 60  0000 C CNN
-F 1 "TLV9152IDR" H 5050 4050 60  0000 C CNN
-F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 5150 3150 60  0001 C CNN
-F 3 "" H 5000 3600 60  0000 C CNN
-	1    5000 3600
-	1    0    0    -1  
-$EndComp
+	6000 3750 4750 3750
 Wire Wire Line
-	5600 2800 5600 3100
-Connection ~ 5600 3100
+	2150 4300 2500 4300
 Wire Wire Line
-	5600 3100 5600 3400
-$Comp
-L Device:Q_NMOS_GSD QE1
-U 1 1 609CA423
-P 5800 3100
-AR Path="/5E39B760/609CA423" Ref="QE1"  Part="1" 
-AR Path="/5E3EAB60/609CA423" Ref="QE2"  Part="1" 
-AR Path="/5E3EC44B/609CA423" Ref="QE3"  Part="1" 
-AR Path="/5E3ED540/609CA423" Ref="QE4"  Part="1" 
-AR Path="/5E4039E0/609CA423" Ref="QE5"  Part="1" 
-AR Path="/5E4039E6/609CA423" Ref="QE6"  Part="1" 
-AR Path="/5E4039EC/609CA423" Ref="QE7"  Part="1" 
-AR Path="/5E4039F2/609CA423" Ref="QE8"  Part="1" 
-F 0 "QE8" H 6004 3146 50  0000 L CNN
-F 1 "Q_NMOS_GSD" H 6004 3055 50  0000 L CNN
-F 2 "Package_TO_SOT_SMD:SOT-23_Handsoldering" H 6000 3200 50  0001 C CNN
-F 3 "~" H 5800 3100 50  0001 C CNN
-	1    5800 3100
-	1    0    0    -1  
-$EndComp
+	5700 5000 6600 5000
+Wire Wire Line
+	6600 4300 6150 4300
+Wire Wire Line
+	6150 4300 6150 3500
+Wire Wire Line
+	6150 3500 2500 3500
+Wire Wire Line
+	2500 3500 2500 4300
+Connection ~ 2500 4300
+Wire Wire Line
+	2500 4300 3000 4300
+Wire Wire Line
+	7500 4500 7400 4500
+Wire Wire Line
+	7400 4500 7400 5000
+Wire Wire Line
+	7400 5000 6900 5000
+Wire Wire Line
+	7000 4300 7400 4300
+Wire Wire Line
+	7650 4000 7400 4000
+Wire Wire Line
+	7400 4000 7400 4300
+Connection ~ 7400 4300
+Wire Wire Line
+	7400 4300 7500 4300
+Wire Wire Line
+	7950 4000 8150 4000
+Wire Wire Line
+	8150 4000 8150 4400
+Connection ~ 8150 4400
+Wire Wire Line
+	8150 4400 8100 4400
+Wire Wire Line
+	8750 4000 8500 4000
+Wire Wire Line
+	8500 4000 8500 4200
 $EndSCHEMATC