Version 4
SHEET 1 1208 680
WIRE 144 112 -176 112
WIRE 176 128 -160 128
WIRE 224 128 176 128
WIRE 368 128 304 128
WIRE 176 144 176 128
WIRE -112 160 -128 160
WIRE 144 160 144 112
WIRE 144 160 112 160
WIRE 368 160 368 128
WIRE -112 224 -144 224
WIRE 144 224 112 224
WIRE 320 224 304 224
WIRE 368 272 368 256
WIRE -160 288 -160 128
WIRE -112 288 -160 288
WIRE 144 288 112 288
WIRE 176 288 144 288
WIRE -176 352 -176 112
WIRE -112 352 -176 352
WIRE 128 352 112 352
WIRE -176 384 -176 352
WIRE 128 384 128 352
WIRE 128 384 -16 384
WIRE -144 400 -144 224
WIRE 144 400 144 288
WIRE 144 400 -144 400
WIRE 304 400 304 224
WIRE 304 400 144 400
WIRE 368 400 368 352
WIRE 368 400 304 400
WIRE -16 432 -16 384
WIRE 144 432 144 400
WIRE -176 480 -176 464
WIRE -128 480 -128 160
WIRE -128 480 -176 480
WIRE -176 512 -176 480
WIRE -128 528 -128 480
WIRE -16 528 -16 496
WIRE -16 528 -128 528
WIRE 144 528 144 496
WIRE 144 528 -16 528
FLAG -176 512 0
FLAG 176 144 Sqr
IOPIN 176 144 Out
FLAG 176 288 Tri
IOPIN 176 288 Out
SYMBOL Robertugo\\555_ALL 48 272 R0
SYMATTR InstName U1
SYMBOL cap 128 432 R0
SYMATTR InstName Ct
SYMATTR Value 1n
SYMBOL cap -32 432 R0
SYMATTR InstName Cbp
SYMATTR Value 10n
SYMBOL voltage -176 368 R0
WINDOW 0 -32 6 Left 0
WINDOW 3 -15 59 Left 0
SYMATTR InstName V+
SYMATTR Value 12
SYMBOL njf 320 160 R0
WINDOW 0 77 26 Left 0
WINDOW 3 25 52 Left 0
SYMATTR InstName J1
SYMATTR Value 2N3821
SYMBOL res 352 256 R0
SYMATTR InstName Rsource
SYMATTR Value 100
SYMBOL res 320 112 R90
WINDOW 0 61 75 VBottom 0
WINDOW 3 32 -1 VTop 0
SYMATTR InstName RLoad
SYMATTR Value 5k6
TEXT -114 504 Left 0 !.tran 1m