Version 4 SHEET 1 1224 816 WIRE 288 16 288 -32 WIRE 0 128 0 64 WIRE 432 144 432 80 WIRE 432 160 432 144 WIRE 288 176 288 96 WIRE 384 176 288 176 WIRE 288 240 288 176 WIRE 0 256 0 208 WIRE 432 272 432 256 WIRE 432 288 432 272 WIRE 288 368 288 320 WIRE 432 416 432 368 FLAG 432 416 0 FLAG 432 80 VDD FLAG 0 256 0 FLAG 0 64 VDD FLAG 432 144 S FLAG 432 272 D FLAG 288 -32 VDD FLAG 288 368 0 SYMBOL voltage 0 112 R0 SYMATTR InstName Vps1 SYMATTR Value 5V SYMBOL res 416 272 R0 SYMATTR InstName RD SYMATTR Value 8k SYMBOL pmos 384 256 M180 SYMATTR InstName M1 SYMATTR Value pmos_enhancement_mosfet L=10u W=10u SYMBOL res 272 224 R0 SYMATTR InstName RG2 SYMATTR Value 3Meg SYMBOL res 272 0 R0 SYMATTR InstName RG1 SYMATTR Value 2Meg TEXT 376 512 Left 2 !.OP TEXT 40 464 Left 2 !.model pmos_enhancement_mosfet pmos (kp=1m Vto=-1V lambda=0)