Version 4 SHEET 1 2392 888 WIRE -176 -16 -320 -16 WIRE -320 0 -320 -16 WIRE -176 0 -176 -16 WIRE -320 96 -320 80 WIRE -176 96 -176 80 WIRE 496 96 -176 96 WIRE 496 128 496 96 WIRE -176 192 -176 96 WIRE -160 192 -176 192 WIRE -64 192 -96 192 WIRE -32 192 -64 192 WIRE 64 192 32 192 WIRE 96 192 64 192 WIRE 176 192 160 192 WIRE 240 192 176 192 WIRE 448 192 320 192 WIRE -64 224 -64 192 WIRE 64 224 64 192 WIRE 176 224 176 192 WIRE 496 288 496 224 WIRE 592 288 496 288 WIRE 592 304 592 288 WIRE -64 320 -64 304 WIRE 64 320 64 304 WIRE 112 320 64 320 WIRE 176 320 176 304 WIRE 496 320 496 288 WIRE 64 336 64 320 WIRE 112 384 112 320 WIRE 112 384 96 384 WIRE 496 416 496 384 WIRE 592 416 592 384 WIRE 592 416 496 416 WIRE 64 432 64 416 WIRE 496 432 496 416 FLAG -64 320 0 FLAG 176 320 0 FLAG 64 432 0 FLAG 496 432 0 FLAG -176 -16 22V IOPIN -176 -16 Out FLAG -320 96 0 SYMBOL pot_ 80 432 R180 WINDOW 0 33 17 Left 2 SYMATTR InstName P2 SYMATTR Value Rtot=2000k SYMATTR Value2 wiper={speed} SYMBOL res 160 208 R0 SYMATTR InstName R14 SYMATTR Value 2200k SYMBOL res -80 208 R0 SYMATTR InstName R15 SYMATTR Value 2200k SYMBOL res 48 208 R0 SYMATTR InstName R16 SYMATTR Value 15 SYMBOL res 336 176 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R17 SYMATTR Value 10k SYMBOL res 576 288 R0 SYMATTR InstName R18 SYMATTR Value 2.2k SYMBOL res -192 -16 R0 SYMATTR InstName R21 SYMATTR Value 10k SYMBOL cap 160 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C13 SYMATTR Value .01µF SYMBOL cap 32 176 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C14 SYMATTR Value .01µF SYMBOL cap -160 208 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C15 SYMATTR Value .01µF SYMBOL polcap 480 320 R0 SYMATTR InstName C17 SYMATTR Value 47µF SYMBOL njf 448 128 R0 SYMATTR InstName Q1 SYMATTR Value 2N3819A SYMBOL voltage -320 -16 R0 WINDOW 123 0 0 Left 0 WINDOW 39 24 124 Left 2 SYMATTR InstName V1 SYMATTR Value 22 TEXT 192 -32 Left 2 !.tran 20 TEXT 192 16 Left 2 !.param speed=0.2