Version 4
SHEET 1 888 680
WIRE 512 32 80 32
WIRE 80 80 80 32
WIRE 112 80 80 80
WIRE 400 80 336 80
WIRE 112 160 96 160
WIRE 384 160 336 160
WIRE 512 160 512 32
WIRE 512 160 384 160
WIRE 384 176 384 160
WIRE 512 176 512 160
WIRE -336 240 -352 240
WIRE -96 240 -256 240
WIRE 48 240 -16 240
WIRE 112 240 48 240
WIRE 352 240 336 240
WIRE 48 256 48 240
WIRE 352 272 352 240
WIRE 384 272 384 256
WIRE 384 272 352 272
WIRE 512 272 512 256
WIRE 384 288 384 272
WIRE 48 352 48 336
WIRE 384 384 384 368
FLAG 512 272 0
FLAG -352 240 0
FLAG 96 160 0
FLAG 400 80 OUT
FLAG 48 352 0
FLAG 384 384 0
SYMBOL LTC6990 224 160 R0
SYMATTR InstName U1
SYMBOL res 368 160 R0
SYMATTR InstName R1
SYMATTR Value 1Meg
SYMBOL res 368 272 R0
SYMATTR InstName R2
SYMATTR Value 887K
SYMBOL res 32 240 R0
SYMATTR InstName R3
SYMATTR Value 196K
SYMBOL res 0 224 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 261K
SYMBOL voltage 512 160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -240 240 R90
WINDOW 3 32 56 VTop 2
WINDOW 123 74 56 VTop 2
WINDOW 39 53 56 VTop 2
WINDOW 0 -32 56 VBottom 2
SYMATTR Value PULSE(2 1 5m 20m 20m 5m 50m)
SYMATTR InstName V2
TEXT 224 24 Bottom 2 ;TimerBlox\n500Hz to 2KHz Voltage Controlled Oscillator\nControl Voltage Ramps from 2V to 1V\nStartup Modeled
TEXT 488 368 Left 2 !.tran 60m startup