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:special 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 24 0 EELAYER END $Descr USLetter 11000 8500 encoding utf-8 Sheet 1 1 Title "" Date "" Rev "" Comp "" Comment1 "" Comment2 "" Comment3 "" Comment4 "" $EndDescr $Comp L C C1 U 1 1 553AF4AB P 2200 1850 F 0 "C1" H 2200 1950 40 0000 L CNN F 1 "0.1uF" V 2250 1650 40 0000 L CNN F 2 "" H 2238 1700 30 0000 C CNN F 3 "" H 2200 1850 60 0000 C CNN 1 2200 1850 1 0 0 -1 $EndComp $Comp L C C3 U 1 1 553AF5B2 P 3700 3200 F 0 "C3" H 3700 3300 40 0000 L CNN F 1 "0.1uF" V 3750 3000 40 0000 L CNN F 2 "" H 3738 3050 30 0000 C CNN F 3 "" H 3700 3200 60 0000 C CNN 1 3700 3200 1 0 0 -1 $EndComp $Comp L C C2 U 1 1 553AF5DC P 4100 2300 F 0 "C2" H 4100 2400 40 0000 L CNN F 1 "0.1uF" V 4150 2100 40 0000 L CNN F 2 "" H 4138 2150 30 0000 C CNN F 3 "" H 4100 2300 60 0000 C CNN 1 4100 2300 0 1 1 0 $EndComp Text Notes 6350 7000 0 60 ~ 0 Modified from EEWeb.com noise generator.\nOriginally from Silicon Chip Jan 2005. $Comp L BATTERY BT1 U 1 1 553AF696 P 1500 2550 F 0 "BT1" H 1500 2750 50 0000 C CNN F 1 "BATTERY" H 1500 2360 50 0000 C CNN F 2 "" H 1500 2550 60 0000 C CNN F 3 "" H 1500 2550 60 0000 C CNN 1 1500 2550 0 1 1 0 $EndComp $Comp L R R1 U 1 1 553AF73B P 2500 1850 F 0 "R1" V 2580 1850 40 0000 C CNN F 1 "470K" V 2507 1851 40 0000 C CNN F 2 "" V 2430 1850 30 0000 C CNN F 3 "" H 2500 1850 30 0000 C CNN 1 2500 1850 1 0 0 -1 $EndComp $Comp L NPN Q1 U 1 1 553AF883 P 2600 2500 F 0 "Q1" H 2600 2350 50 0000 R CNN F 1 "3904" H 2600 2650 50 0000 R CNN F 2 "" H 2600 2500 60 0000 C CNN F 3 "" H 2600 2500 60 0000 C CNN 1 2600 2500 -1 0 0 1 $EndComp $Comp L NPN Q2 U 1 1 553AFA3A P 3250 2500 F 0 "Q2" H 3250 2350 50 0000 R CNN F 1 "3904" H 3250 2650 50 0000 R CNN F 2 "" H 3250 2500 60 0000 C CNN F 3 "" H 3250 2500 60 0000 C CNN 1 3250 2500 1 0 0 -1 $EndComp $Comp L R R2 U 1 1 553AFB5D P 3350 1850 F 0 "R2" V 3430 1850 40 0000 C CNN F 1 "4.7K" V 3357 1851 40 0000 C CNN F 2 "" V 3280 1850 30 0000 C CNN F 3 "" H 3350 1850 30 0000 C CNN 1 3350 1850 1 0 0 -1 $EndComp $Comp L R R4 U 1 1 553AFC6F P 3350 3200 F 0 "R4" V 3430 3200 40 0000 C CNN F 1 "1K" V 3357 3201 40 0000 C CNN F 2 "" V 3280 3200 30 0000 C CNN F 3 "" H 3350 3200 30 0000 C CNN 1 3350 3200 1 0 0 -1 $EndComp $Comp L R R3 U 1 1 553AFD10 P 4400 2850 F 0 "R3" V 4480 2850 40 0000 C CNN F 1 "100K" V 4407 2851 40 0000 C CNN F 2 "" V 4330 2850 30 0000 C CNN F 3 "" H 4400 2850 30 0000 C CNN 1 4400 2850 1 0 0 -1 $EndComp Wire Wire Line 1500 2250 1500 1500 Wire Wire Line 1500 1500 3350 1500 Wire Wire Line 2200 1500 2200 1650 Wire Wire Line 2500 1500 2500 1600 Connection ~ 2200 1500 Wire Wire Line 3350 1500 3350 1600 Connection ~ 2500 1500 Wire Wire Line 2200 2050 2200 2200 Wire Wire Line 2200 2200 2500 2200 Wire Wire Line 2500 2100 2500 2300 Connection ~ 2500 2200 Wire Wire Line 3350 2100 3350 2300 Wire Wire Line 2800 2500 3050 2500 Wire Wire Line 3350 2950 3350 2700 Wire Wire Line 3700 3000 3700 2800 Wire Wire Line 3700 2800 3350 2800 Connection ~ 3350 2800 Wire Wire Line 1500 3600 4850 3600 Wire Wire Line 3350 3600 3350 3450 Wire Wire Line 3700 3600 3700 3400 Connection ~ 3350 3600 Wire Wire Line 4400 3600 4400 3100 Connection ~ 3700 3600 Wire Wire Line 3350 2300 3900 2300 Wire Wire Line 4300 2300 4700 2300 Wire Wire Line 4400 2300 4400 2600 Wire Wire Line 1500 2850 1500 3600 $Comp L BNC P1 U 1 1 553B0000 P 4850 2300 F 0 "P1" H 4860 2420 60 0000 C CNN F 1 "BNC" V 4960 2240 40 0000 C CNN F 2 "" H 4850 2300 60 0000 C CNN F 3 "" H 4850 2300 60 0000 C CNN 1 4850 2300 1 0 0 -1 $EndComp Connection ~ 4400 2300 Wire Wire Line 4850 3600 4850 2500 Connection ~ 4400 3600 Text Notes 2300 2950 0 60 ~ 0 Not\nConnected $EndSCHEMATC