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:key-cache 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 555_timer U1 U 1 1 56607DEB P 2000 1750 F 0 "U1" H 2000 1850 70 0000 C CNN F 1 "555_timer" H 2000 1650 70 0000 C CNN F 2 "" H 2000 1750 60 0000 C CNN F 3 "" H 2000 1750 60 0000 C CNN 1 2000 1750 1 0 0 -1 $EndComp $Comp L +5V #PWR01 U 1 1 56607E83 P 2000 900 F 0 "#PWR01" H 2000 750 50 0001 C CNN F 1 "+5V" H 2000 1040 50 0000 C CNN F 2 "" H 2000 900 60 0000 C CNN F 3 "" H 2000 900 60 0000 C CNN 1 2000 900 1 0 0 -1 $EndComp $Comp L GND #PWR02 U 1 1 56607E99 P 2000 2650 F 0 "#PWR02" H 2000 2400 50 0001 C CNN F 1 "GND" H 2000 2500 50 0000 C CNN F 2 "" H 2000 2650 60 0000 C CNN F 3 "" H 2000 2650 60 0000 C CNN 1 2000 2650 1 0 0 -1 $EndComp Text GLabel 2800 2000 2 60 Input ~ 0 ACTIVE $Comp L C C2 U 1 1 56607F26 P 3350 1950 F 0 "C2" H 3375 2050 50 0000 L CNN F 1 "0.1µF" H 3375 1850 50 0000 L CNN F 2 "" H 3388 1800 30 0000 C CNN F 3 "" H 3350 1950 60 0000 C CNN 1 3350 1950 1 0 0 -1 $EndComp $Comp L R R1 U 1 1 56607F5A P 1100 1250 F 0 "R1" V 1180 1250 50 0000 C CNN F 1 "12K" V 1100 1250 50 0000 C CNN F 2 "" V 1030 1250 30 0000 C CNN F 3 "" H 1100 1250 30 0000 C CNN 1 1100 1250 1 0 0 -1 $EndComp $Comp L R R2 U 1 1 56607F78 P 1100 1750 F 0 "R2" V 1180 1750 50 0000 C CNN F 1 "270K" V 1100 1750 50 0000 C CNN F 2 "" V 1030 1750 30 0000 C CNN F 3 "" H 1100 1750 30 0000 C CNN 1 1100 1750 1 0 0 -1 $EndComp $Comp L C C1 U 1 1 56607FA1 P 1100 2200 F 0 "C1" H 1125 2300 50 0000 L CNN F 1 "0.01µF" H 1125 2100 50 0000 L CNN F 2 "" H 1138 2050 30 0000 C CNN F 3 "" H 1100 2200 60 0000 C CNN 1 1100 2200 1 0 0 -1 $EndComp Wire Wire Line 2000 900 2000 1350 Wire Wire Line 2000 2150 2000 2650 Wire Wire Line 2700 2000 2800 2000 Wire Wire Line 3350 2100 3350 2250 Wire Wire Line 3350 2250 2000 2250 Connection ~ 2000 2250 Wire Wire Line 2700 1750 3350 1750 Wire Wire Line 3350 1750 3350 1800 Wire Wire Line 1100 2350 1100 2450 Wire Wire Line 1100 2450 2000 2450 Connection ~ 2000 2450 Wire Wire Line 1100 2000 1300 2000 Wire Wire Line 1100 1900 1100 2050 Connection ~ 1100 2000 Wire Wire Line 1300 1750 1250 1750 Wire Wire Line 1250 1750 1250 2000 Connection ~ 1250 2000 Wire Wire Line 1300 1500 1100 1500 Wire Wire Line 1100 1400 1100 1600 Connection ~ 1100 1500 Wire Wire Line 1100 1100 1100 1000 Wire Wire Line 1100 1000 2000 1000 Connection ~ 2000 1000 $Comp L POT RV1 U 1 1 566081EC P 4050 1500 F 0 "RV1" H 4050 1400 50 0000 C CNN F 1 "10K" H 4050 1500 50 0000 C CNN F 2 "" H 4050 1500 60 0000 C CNN F 3 "" H 4050 1500 60 0000 C CNN 1 4050 1500 -1 0 0 1 $EndComp $Comp L PIEZO P1 U 1 1 566082B3 P 4050 2100 F 0 "P1" H 4250 2250 60 0000 C CNN F 1 "PIEZO" H 4300 1950 60 0000 C CNN F 2 "" H 4050 2100 60 0000 C CNN F 3 "" H 4050 2100 60 0000 C CNN 1 4050 2100 1 0 0 -1 $EndComp Wire Wire Line 2700 1500 3800 1500 Wire Wire Line 4050 1650 4050 1900 Wire Wire Line 4050 2300 4050 2350 Wire Wire Line 4050 2350 2000 2350 Connection ~ 2000 2350 NoConn ~ 4300 1500 Text Notes 2450 1100 0 60 ~ 0 261.4Hz Piezo Tone Generator $EndSCHEMATC