Version 4
SHEET 1 2108 680
WIRE -1696 -752 -2032 -752
WIRE -1584 -752 -1696 -752
WIRE -2352 -512 -2480 -512
WIRE -2320 -512 -2352 -512
WIRE -1584 -496 -1584 -752
WIRE -1584 -496 -1808 -496
WIRE -2480 -480 -2480 -512
WIRE -1808 -480 -1808 -496
WIRE -1584 -480 -1584 -496
WIRE -1344 -480 -1584 -480
WIRE -1232 -480 -1264 -480
WIRE -1024 -480 -1152 -480
WIRE -912 -480 -960 -480
WIRE -2480 -384 -2480 -400
WIRE -2320 -384 -2480 -384
WIRE -1584 -384 -1584 -480
WIRE -2480 -352 -2480 -384
WIRE -2320 -352 -2320 -384
WIRE -1952 -256 -2080 -256
WIRE -1808 -256 -1808 -400
WIRE -1808 -256 -1888 -256
WIRE -1520 -256 -1520 -336
WIRE -1520 -256 -1808 -256
WIRE -2480 -208 -2480 -272
WIRE -2352 -208 -2480 -208
WIRE -2320 -208 -2352 -208
WIRE -1584 -192 -1584 -288
WIRE -1424 -192 -1584 -192
WIRE -1232 -192 -1360 -192
WIRE -912 -192 -912 -480
WIRE -912 -192 -1232 -192
WIRE -2080 -144 -2080 -256
WIRE -2080 -144 -2448 -144
WIRE -1584 -48 -1584 -192
WIRE -2448 -32 -2448 -144
WIRE -2080 -16 -2080 -144
WIRE -1952 -16 -2080 -16
WIRE -1792 -16 -1888 -16
WIRE -1648 -16 -1792 -16
WIRE -1648 0 -1648 -16
WIRE -1792 32 -1792 -16
WIRE -1232 48 -1232 -192
WIRE -1792 208 -1792 112
WIRE -1232 352 -1232 128
WIRE -1968 384 -2032 384
WIRE -1584 384 -1584 48
WIRE -1584 384 -1968 384
FLAG -2320 -352 0
FLAG -2352 -512 plus20
FLAG -2352 -208 minus20
FLAG -1792 208 0
FLAG -1232 352 0
FLAG -2448 48 0
FLAG -1968 384 minus20
FLAG -1696 -752 plus20
SYMBOL voltage -2480 -496 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 20
SYMBOL voltage -2480 -368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 20
SYMBOL npn -1648 -48 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL pnp -1520 -288 R180
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL res -1824 -496 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -1808 16 R0
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL res -1248 32 R0
SYMATTR InstName R3
SYMATTR Value 8.45k
SYMBOL res -1248 -496 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res -1136 -496 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R5
SYMATTR Value 7k
SYMBOL cap -1360 -208 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C5
SYMATTR Value 10µf
SYMBOL cap -1888 -32 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C6
SYMATTR Value 0.1µf
SYMBOL cap -1888 -272 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C7
SYMATTR Value 0.1µf
SYMBOL voltage -2448 -48 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(8.5 7 1u 0 0 4u)
SYMBOL diode -1024 -464 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D1
SYMATTR Value MMSD4148
TEXT -2512 432 Left 0 !.tran 7us