Version 4
SHEET 1 880 680
WIRE 272 -32 272 -64
WIRE 272 96 272 48
WIRE 272 96 80 96
WIRE 304 96 272 96
WIRE 400 96 368 96
WIRE 80 128 80 96
WIRE 272 208 272 96
WIRE -32 256 -64 256
WIRE 80 256 80 208
WIRE 80 256 32 256
WIRE 208 256 80 256
WIRE 80 288 80 256
WIRE 272 320 272 304
WIRE 400 320 272 320
WIRE 272 336 272 320
WIRE 400 336 400 320
WIRE 80 432 80 368
WIRE 272 432 272 416
WIRE 272 432 80 432
WIRE 400 432 400 400
WIRE 400 432 272 432
WIRE 272 464 272 432
FLAG -64 256 IN
IOPIN -64 256 In
FLAG 400 96 OUT
IOPIN 400 96 Out
FLAG 272 -64 V+
IOPIN 272 -64 BiDir
FLAG 272 464 GND
IOPIN 272 464 BiDir
SYMBOL res 64 112 R0
SYMATTR InstName R1
SYMATTR Value {top}
SYMBOL res 64 272 R0
SYMATTR InstName R2
SYMATTR Value {bot}
SYMBOL res 256 -48 R0
SYMATTR InstName R3
SYMATTR Value 2K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 256 320 R0
SYMATTR InstName R4
SYMATTR Value 100
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL npn 208 208 R0
SYMATTR InstName Q1
SYMATTR Value 2N3904
SYMBOL cap 368 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 2.2u
SYMATTR SpiceLine V=25 Irms=0 Rser=0.001 MTBF=0 Lser=0 mfg="TDK" pn="C575OX7RIE106M" type="X7R" ppPkg=1
SYMBOL cap 32 240 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 2.2u
SYMATTR SpiceLine V=100 Irms=4.58 Rser=0.025 MTBF=0 Lser=0 mfg="KEMET" pn="C2225C105K1RAC" type="X7R" ppPkg=1
SYMBOL cap 416 400 R180
WINDOW 0 -19 70 Bottom 2
WINDOW 3 -19 -8 Top 2
SYMATTR InstName C2
SYMATTR Value 100u
SYMATTR SpiceLine V=25 Irms=0 Rser=0.001 MTBF=0 Lser=0 mfg="TDK" pn="C575OX7RIE106M" type="X7R" ppPkg=1
TEXT -56 -40 Left 2 !.param top=150k\n.param bot=33k