Version 4 SHEET 1 3076 2152 WIRE 1232 1392 1184 1392 WIRE 1296 1392 1232 1392 WIRE 1552 1392 1520 1392 WIRE 1232 1408 1232 1392 WIRE 1552 1424 1552 1392 WIRE 1552 1456 1520 1456 WIRE 1232 1488 1232 1472 WIRE 1296 1520 1264 1520 WIRE 1792 1520 1520 1520 WIRE 1296 1584 1168 1584 WIRE 1584 1584 1520 1584 WIRE 1792 1600 1792 1520 WIRE 1168 1616 1168 1584 WIRE 1264 1648 1264 1520 WIRE 1408 1648 1264 1648 WIRE 1552 1648 1552 1456 WIRE 1552 1648 1408 1648 WIRE 1680 1712 1552 1712 WIRE 1792 1712 1792 1680 WIRE 1792 1712 1744 1712 WIRE 1264 1728 1072 1728 WIRE 1552 1760 1552 1712 WIRE 1072 1808 1072 1728 WIRE 1120 1808 1072 1808 WIRE 1264 1824 1264 1728 WIRE 1264 1824 1184 1824 WIRE 1120 1840 1072 1840 WIRE 1408 1840 1408 1648 WIRE 1552 1840 1408 1840 WIRE 1264 1856 1264 1824 WIRE 1072 1952 1072 1840 WIRE 1104 1952 1072 1952 WIRE 1120 1952 1104 1952 WIRE 1232 1952 1200 1952 WIRE 1264 1952 1264 1936 WIRE 1264 1952 1232 1952 WIRE 1408 1952 1408 1840 WIRE 1408 1952 1264 1952 WIRE 1552 1968 1552 1920 WIRE 1680 1968 1552 1968 WIRE 1792 1968 1792 1712 WIRE 1792 1968 1744 1968 WIRE 1072 1984 1072 1952 WIRE 1152 2000 1152 1968 WIRE 1232 2000 1232 1952 WIRE 1232 2000 1152 2000 WIRE 1072 2064 1072 2048 FLAG 1552 1424 0 FLAG 1168 1680 0 FLAG 1232 1488 0 FLAG 976 1488 vcc FLAG 976 1568 0 FLAG 1184 1392 vcc FLAG 1584 1584 vcc FLAG 1152 1856 0 FLAG 1152 1792 vcc FLAG 1072 2064 0 FLAG 1104 1952 c SYMBOL cap 1184 1616 M0 WINDOW 3 -67 51 Left 0 SYMATTR Value 100nF SYMATTR InstName C2 SYMBOL Misc\\NE555 1408 1488 M0 SYMATTR InstName U2 SYMBOL cap 1248 1408 M0 WINDOW 3 18 57 Left 0 SYMATTR Value 100nF SYMATTR InstName C4 SYMBOL battery 976 1472 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 9 SYMBOL Opamps\\2pole 1152 1824 R0 SYMATTR InstName U1 SYMBOL cap 1056 1984 R0 SYMATTR InstName C1 SYMATTR Value 1n SYMBOL res 1248 1840 R0 SYMATTR InstName R2 SYMATTR Value 100 SYMBOL res 1216 1936 R90 WINDOW 0 -6 85 VBottom 0 WINDOW 3 -32 35 VTop 0 SYMATTR InstName R3 SYMATTR Value {Rc} SYMBOL res 1536 1856 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R1 SYMATTR Value {(1-k)*Rdc+1m} SYMBOL res 1536 1936 M180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R5 SYMATTR Value {k*Rdc+1m} SYMBOL res 1808 1696 R180 WINDOW 0 36 76 Left 0 WINDOW 3 36 40 Left 0 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL diode 1744 1696 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL diode 1680 1984 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName D2 SYMATTR Value 1N4148 TEXT 1840 1608 Left 0 !.tran 5m TEXT 1848 1656 Left 0 !*.step dec param Rc 1k 100k 1 TEXT 1856 1792 Left 0 !.param Rdc=100k TEXT 1856 1760 Left 0 !.step param k 0 1 0.5 TEXT 1856 1720 Left 0 !.param Rc=1k TEXT 1856 1824 Left 0 !.param k=0.5 TEXT 1848 1864 Left 0 !.ic v(c)=4.5 TEXT 1416 1864 Left 0 ;duty cycle TEXT 1136 2016 Left 0 ;frequency TEXT 1216 2064 Left 0 ;capacitance \nmultiplier LINE Normal 1144 1989 1152 1968 LINE Normal 1160 1989 1144 1989 LINE Normal 1152 1968 1160 1989 LINE Normal 1531 1832 1552 1840 LINE Normal 1531 1848 1531 1832 LINE Normal 1552 1840 1531 1848 RECTANGLE Normal 1360 2112 1008 1712