On 11/24/2011 9:04 PM, John Larkin wrote:
Change the top two transistors to be the compliment of the bottom two transistors. Like this:
Version 4 SHEET 1 1176 680 WIRE -32 -192 -272 -192 WIRE 320 -192 -32 -192 WIRE 544 -192 320 -192 WIRE -272 -144 -272 -192 WIRE -32 -144 -32 -192 WIRE 320 -64 320 -192 WIRE -272 -48 -272 -64 WIRE 256 -16 208 -16 WIRE 544 -16 544 -192 WIRE -32 32 -32 -64 WIRE 144 32 -32 32 WIRE 320 80 320 32 WIRE 320 80 208 80 WIRE 544 80 544 48 WIRE 544 80 320 80 WIRE -32 160 -32 32 WIRE 320 272 320 80 WIRE 752 272 320 272 WIRE 992 272 832 272 WIRE 992 304 992 272 WIRE 320 336 320 272 WIRE 320 336 224 336 WIRE -32 384 -32 240 WIRE 96 384 -32 384 WIRE 160 384 96 384 WIRE 320 384 320 336 WIRE -224 432 -304 432 WIRE -96 432 -144 432 WIRE 256 432 224 432 WIRE 992 432 992 384 WIRE 96 448 96 384 WIRE 224 448 224 432 WIRE -32 512 -32 480 WIRE -32 624 -32 592 WIRE 96 624 96 512 WIRE 96 624 -32 624 WIRE 224 624 224 528 WIRE 224 624 96 624 WIRE 320 624 320 480 WIRE 320 624 224 624 WIRE 96 656 96 624 FLAG -272 -48 0 FLAG -304 512 0 FLAG 992 432 0 FLAG 96 656 0 SYMBOL npn 144 -16 R0 SYMATTR InstName Q1 SYMATTR Value 2N2222 SYMBOL pnp 160 432 M180 SYMATTR InstName Q3 SYMATTR Value 2N2907 SYMBOL npn 256 384 R0 SYMATTR InstName Q4 SYMATTR Value 2N2222 SYMBOL res 208 432 R0 SYMATTR InstName R1 SYMATTR Value 100k SYMBOL res -48 -160 R0 SYMATTR InstName R2 SYMATTR Value 100k SYMBOL npn -96 384 R0 SYMATTR InstName Q5 SYMATTR Value 2N3904 SYMBOL res -48 496 R0 SYMATTR InstName R3 SYMATTR Value 4.7k SYMBOL voltage -272 -160 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V1 SYMATTR Value 10 SYMBOL Misc\\signal -304 416 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value SINE(.79 .1 1K) SYMBOL res -128 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R4 SYMATTR Value 56k SYMBOL schottky 560 48 R180 WINDOW 0 24 72 Left 2 WINDOW 3 24 0 Left 2 SYMATTR InstName D4 SYMATTR Value 1N5817 SYMATTR Description Diode SYMATTR Type diode SYMBOL pnp 256 32 M180 SYMATTR InstName Q2 SYMATTR Value 2N2907 SYMBOL res 736 256 M90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 100 SYMBOL cap 80 448 R0 SYMATTR InstName C1 SYMATTR Value 10p SYMBOL voltage 992 288 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value 5 SYMBOL voltage -32 144 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V4 SYMATTR Value 1.137 TEXT -328 -216 Left 2 !.tran 0 .01 0