Version 4
SHEET 1 880 680
WIRE 112 112 16 112
WIRE 224 112 112 112
WIRE 16 128 16 112
WIRE 224 144 224 112
WIRE 112 208 112 112
WIRE -256 240 -288 240
WIRE -176 240 -192 240
WIRE -64 240 -96 240
WIRE 16 240 16 208
WIRE 16 240 -64 240
WIRE 80 240 16 240
WIRE -288 288 -288 240
WIRE -64 288 -64 240
WIRE 16 288 16 240
WIRE 224 288 224 224
WIRE -288 384 -288 368
WIRE -64 384 -64 352
WIRE -64 384 -288 384
WIRE 16 384 16 368
WIRE 16 384 -64 384
WIRE 112 384 112 272
WIRE 112 384 16 384
WIRE 224 384 224 368
WIRE 224 384 112 384
WIRE 112 400 112 384
FLAG 112 400 0
SYMBOL Vreg\\tl431 96 208 R0
WINDOW 38 84 35 Center 0
SYMATTR InstName U1
SYMATTR SpiceModel TL431
SYMBOL res 0 112 R0
SYMATTR InstName R1
SYMATTR Value 1k8
SYMBOL res 0 272 R0
WINDOW 0 26 48 Left 0
WINDOW 3 27 83 Left 0
SYMATTR InstName R2
SYMATTR Value 1e6
SYMBOL cap -80 288 R0
SYMATTR InstName C1
SYMATTR Value 3n
SYMBOL voltage 224 272 R0
WINDOW 0 -52 15 Left 0
WINDOW 3 -6 59 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 7 98 Left 0
SYMATTR InstName Vcc
SYMATTR Value 3
SYMBOL res 208 128 R0
SYMATTR InstName RL
SYMATTR Value 8
SYMBOL voltage -288 272 R0
WINDOW 0 -14 61 Left 0
WINDOW 3 -8 129 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vs
SYMATTR Value SINE(0 .02 1k)
SYMBOL res -80 224 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL cap -192 224 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C3
SYMATTR Value .22µ
TEXT -298 130 Left 0 !.tran 10m