EESchema Schematic File Version 2
LIBS:power
LIBS:device
LIBS:transistors
LIBS:conn
LIBS:linear
LIBS:regul
LIBS:74xx
LIBS:cmos4000
LIBS:adc-dac
LIBS:memory
LIBS:xilinx
LIBS:microcontrollers
LIBS:dsp
LIBS:microchip
LIBS:analog_switches
LIBS:motorola
LIBS:texas
LIBS:intel
LIBS:audio
LIBS:interface
LIBS:digital-audio
LIBS:philips
LIBS:display
LIBS:cypress
LIBS:siliconi
LIBS:opto
LIBS:atmel
LIBS:contrib
LIBS:valves
LIBS:switches
LIBS:74xgxx
LIBS:ac-dc
LIBS:actel
LIBS:allegro
LIBS:Altera
LIBS:analog_devices
LIBS:battery_management
LIBS:bbd
LIBS:brooktre
LIBS:cmos_ieee
LIBS:dc-dc
LIBS:diode
LIBS:elec-unifil
LIBS:ESD_Protection
LIBS:ftdi
LIBS:gennum
LIBS:graphic
LIBS:hc11
LIBS:ir
LIBS:Lattice
LIBS:logo
LIBS:maxim
LIBS:mechanical
LIBS:microchip_dspic33dsc
LIBS:microchip_pic10mcu
LIBS:microchip_pic12mcu
LIBS:microchip_pic16mcu
LIBS:microchip_pic18mcu
LIBS:microchip_pic32mcu
LIBS:motor_drivers
LIBS:motors
LIBS:msp430
LIBS:nordicsemi
LIBS:nxp_armmcu
LIBS:onsemi
LIBS:Oscillators
LIBS:powerint
LIBS:Power_Management
LIBS:pspice
LIBS:references
LIBS:relays
LIBS:rfcom
LIBS:sensors
LIBS:silabs
LIBS:stm8
LIBS:stm32
LIBS:supertex
LIBS:transf
LIBS:ttl_ieee
LIBS:video
LIBS:wiznet
LIBS:Worldsemi
LIBS:Xicor
LIBS:zetex
LIBS:Zilog
LIBS:4_VCF-cache
EELAYER 25 0
EELAYER END
$Descr User 8858 6299
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text Notes 4300 4900 0    60   ~ 0
4: VOLTAGE CONTROLLED FILTER
Text Notes 5800 2700 0    60   ~ 0
CUTOFF FREQ.\n
Wire Wire Line
	6250 3550 6400 3550
Wire Wire Line
	5900 3550 6050 3550
Text GLabel 6400 3550 2    60   Input ~ 0
AD
Text GLabel 5900 3550 0    60   Input ~ 0
LFO
Wire Wire Line
	5800 3150 5950 3150
Wire Wire Line
	5800 2750 6050 2750
Wire Wire Line
	5650 2450 5650 2600
Wire Wire Line
	5500 2750 5450 2750
Wire Wire Line
	5650 2150 5950 2150
Connection ~ 5450 1450
Connection ~ 5850 1600
Wire Wire Line
	6000 1600 5850 1600
Connection ~ 5000 1850
Wire Wire Line
	5000 1450 5000 1850
Wire Wire Line
	5850 1450 5850 1850
Wire Wire Line
	5800 1450 5850 1450
Wire Wire Line
	5450 1450 5450 1850
Wire Wire Line
	5000 1450 5500 1450
Connection ~ 5350 2200
Wire Wire Line
	4900 1850 5050 1850
Connection ~ 4550 2200
Wire Wire Line
	4600 1850 4550 1850
Connection ~ 4550 2500
Connection ~ 5350 2500
Wire Wire Line
	4950 2200 5050 2200
Connection ~ 5350 3000
Wire Wire Line
	5350 2500 5150 2500
Connection ~ 4550 2900
Wire Wire Line
	4550 2500 4850 2500
Wire Wire Line
	4550 1850 4550 2900
Wire Wire Line
	4550 3100 4600 3100
Wire Wire Line
	4550 3250 4550 3100
Wire Wire Line
	5350 1850 5350 3100
Wire Wire Line
	5200 3000 5350 3000
Wire Wire Line
	4450 2900 4600 2900
Wire Wire Line
	4450 2200 4450 2900
Wire Wire Line
	4050 2200 4150 2200
Wire Wire Line
	3650 2200 3750 2200
Wire Wire Line
	3500 1950 3500 2050
Wire Wire Line
	3400 1950 3500 1950
Wire Wire Line
	3500 2650 3500 2750
Wire Wire Line
	3400 2650 3500 2650
Wire Wire Line
	4050 2900 4150 2900
Wire Wire Line
	3650 2900 3750 2900
$Comp
L +9V #PWR?
U 1 1 5B2C43F7
P 5800 3150
F 0 "#PWR?" H 5800 3000 50  0001 C CNN
F 1 "+9V" H 5800 3290 50  0000 C CNN
F 2 "" H 5800 3150 50  0000 C CNN
F 3 "" H 5800 3150 50  0000 C CNN
	1    5800 3150
	0    -1   -1   0   
$EndComp
Text Notes 5100 3100 0    60   ~ 0
5
Text Notes 4600 3200 0    60   ~ 0
1
$Comp
L LM2902N IC2
U 2 1 5B2B9D45
P 4900 3000
F 0 "IC2" H 4900 3200 50  0000 L CNN
F 1 "LM3900" H 4900 2800 50  0000 L CNN
F 2 "" H 4850 3100 50  0000 C CNN
F 3 "" H 4950 3200 50  0000 C CNN
	2    4900 3000
	1    0    0    1   
$EndComp
Text Notes 2750 2200 0    60   ~ 0
NOISE VOL.
Text Notes 2800 2950 0    60   ~ 0
OSC. VOL.
Text GLabel 5350 3100 3    60   Input ~ 0
ZZ?
Text GLabel 3400 2650 0    60   Input ~ 0
waveform-select-switch
Text GLabel 3400 1950 0    60   Input ~ 0
V
$Comp
L SW_SPST S4
U 1 1 5B2B3AD0
P 4750 2200
F 0 "S4" H 4750 2100 50  0000 C CNN
F 1 "SPST" H 4750 2300 50  0000 C CNN
F 2 "" H 4750 2200 50  0000 C CNN
F 3 "" H 4750 2200 50  0000 C CNN
	1    4750 2200
	-1   0    0    1   
$EndComp
$Comp
L 2SC1941 Q3
U 1 1 5B2B2F1B
P 5650 1950
F 0 "Q3" V 5750 2250 50  0000 L CNN
F 1 "2N3904" V 5650 2100 50  0000 L CNN
F 2 "" H 5500 2250 50  0000 L CIN
F 3 "" H 5650 1950 50  0000 L CNN
	1    5650 1950
	0    1    -1   0   
$EndComp
$Comp
L SW_SPDT S7
U 1 1 5B2B23D8
P 6150 3350
F 0 "S7" V 6100 3550 50  0000 C CNN
F 1 "SPDT" V 6200 3550 50  0000 C CNN
F 2 "" H 6150 3350 50  0000 C CNN
F 3 "" H 6150 3350 50  0000 C CNN
	1    6150 3350
	0    1    1    0   
$EndComp
$Comp
L SW_SPDT S6
U 1 1 5B2B22C9
P 6050 2950
F 0 "S6" V 5950 3150 50  0000 C CNN
F 1 "SPDT" V 6050 3150 50  0000 C CNN
F 2 "" H 6050 2950 50  0000 C CNN
F 3 "" H 6050 2950 50  0000 C CNN
	1    6050 2950
	0    1    1    0   
$EndComp
$Comp
L CP1 C12
U 1 1 5B2B21C9
P 5950 2300
F 0 "C12" H 5975 2400 50  0000 L CNN
F 1 ".1µ" H 5975 2200 50  0000 L CNN
F 2 "" H 5950 2300 50  0000 C CNN
F 3 "" H 5950 2300 50  0000 C CNN
	1    5950 2300
	1    0    0    -1  
$EndComp
$Comp
L CP1 C15
U 1 1 5B2B1FC2
P 5200 2200
F 0 "C15" V 5350 2150 50  0000 L CNN
F 1 "470p" V 5050 2100 50  0000 L CNN
F 2 "" H 5200 2200 50  0000 C CNN
F 3 "" H 5200 2200 50  0000 C CNN
	1    5200 2200
	0    -1   -1   0   
$EndComp
$Comp
L CP1 C13
U 1 1 5B2B1ED8
P 5200 1850
F 0 "C13" V 5450 1800 50  0000 L CNN
F 1 ".02µ" V 5350 1800 50  0000 L CNN
F 2 "" H 5200 1850 50  0000 C CNN
F 3 "" H 5200 1850 50  0000 C CNN
	1    5200 1850
	0    -1   -1   0   
$EndComp
$Comp
L CP1 C14
U 1 1 5B2B1D71
P 4750 1850
F 0 "C14" V 5000 1800 50  0000 L CNN
F 1 ".02µ" V 4900 1800 50  0000 L CNN
F 2 "" H 4750 1850 50  0000 C CNN
F 3 "" H 4750 1850 50  0000 C CNN
	1    4750 1850
	0    -1   -1   0   
$EndComp
$Comp
L CP1 C20
U 1 1 5B2B1C79
P 3900 2900
F 0 "C20" V 3750 2850 50  0000 L CNN
F 1 "1µ" V 3650 2850 50  0000 L CNN
F 2 "" H 3900 2900 50  0000 C CNN
F 3 "" H 3900 2900 50  0000 C CNN
	1    3900 2900
	0    -1   -1   0   
$EndComp
$Comp
L CP1 C19
U 1 1 5B2B1B74
P 3900 2200
F 0 "C19" V 3750 2150 50  0000 L CNN
F 1 ".02µ" V 3650 2150 50  0000 L CNN
F 2 "" H 3900 2200 50  0000 C CNN
F 3 "" H 3900 2200 50  0000 C CNN
	1    3900 2200
	0    -1   -1   0   
$EndComp
$Comp
L R R28
U 1 1 5B2B1988
P 5650 2300
F 0 "R28" H 5500 2350 50  0000 C CNN
F 1 "10K" H 5500 2250 50  0000 C CNN
F 2 "" V 5580 2300 50  0000 C CNN
F 3 "" H 5650 2300 50  0000 C CNN
	1    5650 2300
	1    0    0    -1  
$EndComp
$Comp
L R R25
U 1 1 5B2B189F
P 5650 1450
F 0 "R25" V 5730 1450 50  0000 C CNN
F 1 "100K" V 5650 1450 50  0000 C CNN
F 2 "" V 5580 1450 50  0000 C CNN
F 3 "" H 5650 1450 50  0000 C CNN
	1    5650 1450
	0    1    1    0   
$EndComp
$Comp
L R R29
U 1 1 5B2B17B1
P 5000 2500
F 0 "R29" V 5080 2500 50  0000 C CNN
F 1 "100K" V 5000 2500 50  0000 C CNN
F 2 "" V 4930 2500 50  0000 C CNN
F 3 "" H 5000 2500 50  0000 C CNN
	1    5000 2500
	0    1    1    0   
$EndComp
$Comp
L R R26
U 1 1 5B2B16B2
P 4300 2900
F 0 "R26" V 4380 2900 50  0000 C CNN
F 1 "100K" V 4300 2900 50  0000 C CNN
F 2 "" V 4230 2900 50  0000 C CNN
F 3 "" H 4300 2900 50  0000 C CNN
	1    4300 2900
	0    1    1    0   
$EndComp
$Comp
L R R27
U 1 1 5B2B15BE
P 4300 2200
F 0 "R27" V 4380 2200 50  0000 C CNN
F 1 "20K" V 4300 2200 50  0000 C CNN
F 2 "" V 4230 2200 50  0000 C CNN
F 3 "" H 4300 2200 50  0000 C CNN
	1    4300 2200
	0    1    1    0   
$EndComp
$Comp
L POT R38
U 1 1 5B2B14D5
P 5650 2750
F 0 "R38" V 5550 2750 50  0000 C CNN
F 1 "250K" V 5650 2750 50  0000 C CNN
F 2 "" H 5650 2750 50  0000 C CNN
F 3 "" H 5650 2750 50  0000 C CNN
	1    5650 2750
	0    -1   -1   0   
$EndComp
$Comp
L POT R46
U 1 1 5B2B1385
P 3500 2900
F 0 "R46" H 3350 2950 50  0000 C CNN
F 1 "250K" H 3350 2850 50  0000 C CNN
F 2 "" H 3500 2900 50  0000 C CNN
F 3 "" H 3500 2900 50  0000 C CNN
	1    3500 2900
	1    0    0    -1  
$EndComp
$Comp
L POT R47
U 1 1 5B2B12A6
P 3500 2200
F 0 "R47" H 3350 2250 50  0000 C CNN
F 1 "250K" H 3350 2150 50  0000 C CNN
F 2 "" H 3500 2200 50  0000 C CNN
F 3 "" H 3500 2200 50  0000 C CNN
	1    3500 2200
	1    0    0    -1  
$EndComp
$Comp
L Earth #PWR?
U 1 1 5B2B1091
P 6000 1600
F 0 "#PWR?" H 6000 1350 50  0001 C CNN
F 1 "Earth" H 6000 1450 50  0001 C CNN
F 2 "" H 6000 1600 50  0000 C CNN
F 3 "" H 6000 1600 50  0000 C CNN
	1    6000 1600
	0    -1   -1   0   
$EndComp
$Comp
L Earth #PWR?
U 1 1 5B2B0F99
P 5950 2450
F 0 "#PWR?" H 5950 2200 50  0001 C CNN
F 1 "Earth" H 5950 2300 50  0001 C CNN
F 2 "" H 5950 2450 50  0000 C CNN
F 3 "" H 5950 2450 50  0000 C CNN
	1    5950 2450
	1    0    0    -1  
$EndComp
$Comp
L Earth #PWR?
U 1 1 5B2B0EA1
P 5450 2750
F 0 "#PWR?" H 5450 2500 50  0001 C CNN
F 1 "Earth" H 5450 2600 50  0001 C CNN
F 2 "" H 5450 2750 50  0000 C CNN
F 3 "" H 5450 2750 50  0000 C CNN
	1    5450 2750
	1    0    0    -1  
$EndComp
$Comp
L Earth #PWR?
U 1 1 5B2B0DE2
P 4550 3250
F 0 "#PWR?" H 4550 3000 50  0001 C CNN
F 1 "Earth" H 4550 3100 50  0001 C CNN
F 2 "" H 4550 3250 50  0000 C CNN
F 3 "" H 4550 3250 50  0000 C CNN
	1    4550 3250
	1    0    0    -1  
$EndComp
$Comp
L Earth #PWR?
U 1 1 5B2B0D23
P 3500 3050
F 0 "#PWR?" H 3500 2800 50  0001 C CNN
F 1 "Earth" H 3500 2900 50  0001 C CNN
F 2 "" H 3500 3050 50  0000 C CNN
F 3 "" H 3500 3050 50  0000 C CNN
	1    3500 3050
	1    0    0    -1  
$EndComp
$Comp
L Earth #PWR?
U 1 1 5B2B0C64
P 3500 2350
F 0 "#PWR?" H 3500 2100 50  0001 C CNN
F 1 "Earth" H 3500 2200 50  0001 C CNN
F 2 "" H 3500 2350 50  0000 C CNN
F 3 "" H 3500 2350 50  0000 C CNN
	1    3500 2350
	1    0    0    -1  
$EndComp
$EndSCHEMATC