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
EELAYER 25 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L LM358 U?
U 1 1 58FB120B
P 4200 2600
F 0 "U?" H 4200 2800 50  0000 L CNN
F 1 "LM358" H 4200 2400 50  0000 L CNN
F 2 "" H 4200 2600 50  0000 C CNN
F 3 "" H 4200 2600 50  0000 C CNN
	1    4200 2600
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 58FB12BF
P 3100 1750
F 0 "R?" V 3180 1750 50  0000 C CNN
F 1 "10K" V 3100 1750 50  0000 C CNN
F 2 "" V 3030 1750 50  0000 C CNN
F 3 "" H 3100 1750 50  0000 C CNN
	1    3100 1750
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 58FB12DE
P 3100 3100
F 0 "R?" V 3180 3100 50  0000 C CNN
F 1 "10K" V 3100 3100 50  0000 C CNN
F 2 "" V 3030 3100 50  0000 C CNN
F 3 "" H 3100 3100 50  0000 C CNN
	1    3100 3100
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 1900 3100 2500
Wire Wire Line
	3100 2500 3100 2950
Connection ~ 3100 2500
$Comp
L VCC #PWR?
U 1 1 58FB1397
P 3100 1300
F 0 "#PWR?" H 3100 1150 50  0001 C CNN
F 1 "VCC" H 3100 1450 50  0000 C CNN
F 2 "" H 3100 1300 50  0000 C CNN
F 3 "" H 3100 1300 50  0000 C CNN
	1    3100 1300
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 1300 3100 1600
$Comp
L GND #PWR?
U 1 1 58FB13B9
P 3100 3500
F 0 "#PWR?" H 3100 3250 50  0001 C CNN
F 1 "GND" H 3100 3350 50  0000 C CNN
F 2 "" H 3100 3500 50  0000 C CNN
F 3 "" H 3100 3500 50  0000 C CNN
	1    3100 3500
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 3250 3100 3500
$Comp
L R R?
U 1 1 58FB142C
P 3450 2700
F 0 "R?" V 3530 2700 50  0000 C CNN
F 1 "1K" V 3450 2700 50  0000 C CNN
F 2 "" V 3380 2700 50  0000 C CNN
F 3 "" H 3450 2700 50  0000 C CNN
	1    3450 2700
	0    1    1    0   
$EndComp
$Comp
L R R?
U 1 1 58FB146E
P 4200 3250
F 0 "R?" V 4280 3250 50  0000 C CNN
F 1 "100K" V 4200 3250 50  0000 C CNN
F 2 "" V 4130 3250 50  0000 C CNN
F 3 "" H 4200 3250 50  0000 C CNN
	1    4200 3250
	0    1    1    0   
$EndComp
Wire Wire Line
	4050 3250 3700 3250
Wire Wire Line
	3700 3250 3700 2700
Connection ~ 3700 2700
Wire Wire Line
	4350 3250 4700 3250
Wire Wire Line
	4700 3250 4700 2600
Wire Wire Line
	4500 2600 4700 2600
Wire Wire Line
	4700 2600 5850 2600
$Comp
L JACK_2P J?
U 1 1 58FB1533
P 1550 2600
F 0 "J?" H 1200 2400 50  0000 C CNN
F 1 "JACK_2P" H 1400 2850 50  0000 C CNN
F 2 "" H 1550 2600 50  0000 C CNN
F 3 "" H 1550 2600 50  0000 C CNN
	1    1550 2600
	1    0    0    -1  
$EndComp
$Comp
L CP C?
U 1 1 58FB1628
P 2450 2700
F 0 "C?" H 2475 2800 50  0000 L CNN
F 1 "10uF" H 2475 2600 50  0000 L CNN
F 2 "" H 2488 2550 50  0000 C CNN
F 3 "" H 2450 2700 50  0000 C CNN
	1    2450 2700
	0    -1   -1   0   
$EndComp
$Comp
L GND #PWR?
U 1 1 58FB16D6
P 1700 1950
F 0 "#PWR?" H 1700 1700 50  0001 C CNN
F 1 "GND" H 1700 1800 50  0000 C CNN
F 2 "" H 1700 1950 50  0000 C CNN
F 3 "" H 1700 1950 50  0000 C CNN
	1    1700 1950
	1    0    0    -1  
$EndComp
$Comp
L VCC #PWR?
U 1 1 58FB16F6
P 2250 1900
F 0 "#PWR?" H 2250 1750 50  0001 C CNN
F 1 "VCC" H 2250 2050 50  0000 C CNN
F 2 "" H 2250 1900 50  0000 C CNN
F 3 "" H 2250 1900 50  0000 C CNN
	1    2250 1900
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 58FB1716
P 2250 2150
F 0 "R?" V 2330 2150 50  0000 C CNN
F 1 "2.2K" V 2250 2150 50  0000 C CNN
F 2 "" V 2180 2150 50  0000 C CNN
F 3 "" H 2250 2150 50  0000 C CNN
	1    2250 2150
	1    0    0    -1  
$EndComp
Wire Wire Line
	2000 2450 2000 1850
Wire Wire Line
	2000 1850 1700 1850
Wire Wire Line
	1700 1850 1700 1950
Wire Wire Line
	2250 1900 2250 2000
Wire Wire Line
	2250 2300 2250 2600
Wire Wire Line
	2250 2600 2000 2600
Wire Wire Line
	2300 2700 2000 2700
Wire Wire Line
	3900 2500 3100 2500
Wire Wire Line
	3600 2700 3700 2700
Wire Wire Line
	3700 2700 3900 2700
Wire Wire Line
	3300 2700 2600 2700
$Comp
L GND #PWR?
U 1 1 58FB198D
P 4100 2950
F 0 "#PWR?" H 4100 2700 50  0001 C CNN
F 1 "GND" H 4100 2800 50  0000 C CNN
F 2 "" H 4100 2950 50  0000 C CNN
F 3 "" H 4100 2950 50  0000 C CNN
	1    4100 2950
	1    0    0    -1  
$EndComp
$Comp
L VCC #PWR?
U 1 1 58FB19B0
P 4100 2200
F 0 "#PWR?" H 4100 2050 50  0001 C CNN
F 1 "VCC" H 4100 2350 50  0000 C CNN
F 2 "" H 4100 2200 50  0000 C CNN
F 3 "" H 4100 2200 50  0000 C CNN
	1    4100 2200
	1    0    0    -1  
$EndComp
Wire Wire Line
	4100 2200 4100 2300
Wire Wire Line
	4100 2900 4100 2950
$Comp
L Q_NPN_ECB Q?
U 1 1 58FB1A1F
P 6050 2600
F 0 "Q?" H 6250 2650 50  0000 L CNN
F 1 "Q_NPN_ECB" H 6250 2550 50  0000 L CNN
F 2 "" H 6250 2700 50  0000 C CNN
F 3 "" H 6050 2600 50  0000 C CNN
	1    6050 2600
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 58FB1D50
P 6150 3200
F 0 "R?" V 6230 3200 50  0000 C CNN
F 1 "1K" V 6150 3200 50  0000 C CNN
F 2 "" V 6080 3200 50  0000 C CNN
F 3 "" H 6150 3200 50  0000 C CNN
	1    6150 3200
	-1   0    0    1   
$EndComp
$Comp
L GND #PWR?
U 1 1 58FB1DC0
P 6150 3550
F 0 "#PWR?" H 6150 3300 50  0001 C CNN
F 1 "GND" H 6150 3400 50  0000 C CNN
F 2 "" H 6150 3550 50  0000 C CNN
F 3 "" H 6150 3550 50  0000 C CNN
	1    6150 3550
	1    0    0    -1  
$EndComp
$Comp
L VCC #PWR?
U 1 1 58FB1DE9
P 6150 2050
F 0 "#PWR?" H 6150 1900 50  0001 C CNN
F 1 "VCC" H 6150 2200 50  0000 C CNN
F 2 "" H 6150 2050 50  0000 C CNN
F 3 "" H 6150 2050 50  0000 C CNN
	1    6150 2050
	1    0    0    -1  
$EndComp
Connection ~ 4700 2600
Wire Wire Line
	6150 2400 6150 2050
Wire Wire Line
	6150 2800 6150 3000
Wire Wire Line
	6150 3000 6150 3050
Wire Wire Line
	6150 3350 6150 3550
Wire Notes Line
	900  4100 900  4200
Wire Notes Line
	900  4200 2650 4200
Wire Notes Line
	2650 4200 2650 4100
Wire Notes Line
	2700 4100 2700 4200
Wire Notes Line
	2700 4200 5200 4200
Wire Notes Line
	5200 4200 5200 4100
Wire Notes Line
	5350 4100 5350 4200
$Comp
L Speaker LS?
U 1 1 58FB1F70
P 8100 3000
F 0 "LS?" H 8150 3225 50  0000 R CNN
F 1 "Speaker" H 8150 3150 50  0000 R CNN
F 2 "" H 8100 2800 50  0000 C CNN
F 3 "" H 8090 2950 50  0000 C CNN
	1    8100 3000
	1    0    0    -1  
$EndComp
$Comp
L CP C?
U 1 1 58FB203A
P 7200 3000
F 0 "C?" H 7225 3100 50  0000 L CNN
F 1 "10uF" H 7225 2900 50  0000 L CNN
F 2 "" H 7238 2850 50  0000 C CNN
F 3 "" H 7200 3000 50  0000 C CNN
	1    7200 3000
	0    -1   -1   0   
$EndComp
Wire Wire Line
	7900 3000 7350 3000
Wire Wire Line
	7050 3000 6150 3000
Connection ~ 6150 3000
$Comp
L GND #PWR?
U 1 1 58FB213E
P 7800 3300
F 0 "#PWR?" H 7800 3050 50  0001 C CNN
F 1 "GND" H 7800 3150 50  0000 C CNN
F 2 "" H 7800 3300 50  0000 C CNN
F 3 "" H 7800 3300 50  0000 C CNN
	1    7800 3300
	1    0    0    -1  
$EndComp
Wire Wire Line
	7900 3100 7800 3100
Wire Wire Line
	7800 3100 7800 3300
Wire Notes Line
	5350 4200 7000 4200
Wire Notes Line
	7000 4200 7000 4100
Text Notes 8400 1500 0    60   ~ 0
Design inspired from pg 424 of "Op Amps for Everyone"\n\nThe hearing range is 20-20KHz
$EndSCHEMATC