Version 4 SHEET 1 1504 680 WIRE 160 -32 -80 -32 WIRE 336 -32 160 -32 WIRE 400 -32 336 -32 WIRE 736 -32 400 -32 WIRE 1040 -32 736 -32 WIRE 160 -16 160 -32 WIRE 400 -16 400 -32 WIRE -80 112 -320 112 WIRE -16 112 -16 96 WIRE -16 112 -80 112 WIRE 224 112 -16 112 WIRE 464 112 224 112 WIRE -80 144 -80 112 WIRE 400 272 400 160 WIRE 464 272 400 272 WIRE 560 272 464 272 WIRE 656 272 560 272 WIRE 832 272 736 272 WIRE 1008 272 896 272 WIRE -320 288 -320 112 WIRE 1120 288 1072 288 WIRE 336 304 336 -32 WIRE 400 304 336 304 WIRE 336 352 288 352 WIRE 400 400 384 400 WIRE 464 400 464 336 WIRE 464 400 400 400 WIRE 80 448 80 416 WIRE 80 448 16 448 WIRE 160 448 160 160 WIRE 160 448 80 448 WIRE 208 448 160 448 WIRE 320 448 208 448 WIRE 16 464 16 448 WIRE 208 528 208 448 WIRE 832 544 832 288 WIRE 1008 544 1008 304 WIRE 1008 544 832 544 WIRE 80 592 -64 592 WIRE 208 592 80 592 WIRE 384 592 384 576 WIRE 384 592 208 592 WIRE 832 592 832 544 WIRE 832 592 384 592 WIRE 944 592 832 592 WIRE 288 640 288 352 WIRE 496 640 496 576 WIRE 496 640 288 640 WIRE 1120 640 1120 368 WIRE 1120 640 496 640 WIRE 1120 656 1120 640 FLAG 560 336 0 FLAG 736 -32 +5V FLAG 944 592 0 FLAG -320 368 0 FLAG 1040 48 0 SYMBOL pnp 224 160 R180 SYMATTR InstName Q1 SYMATTR Value 2N3906 SYMBOL pnp 464 160 R180 SYMATTR InstName Q2 SYMATTR Value 2N3906 SYMBOL npn 320 400 R0 SYMATTR InstName Q3 SYMATTR Value BC547B SYMBOL res -96 -48 R0 SYMATTR InstName R1 SYMATTR Value 100 SYMBOL res 144 -32 R0 SYMATTR InstName R2 SYMATTR Value 100 SYMBOL res 384 -32 R0 SYMATTR InstName R3 SYMATTR Value 100 SYMBOL res 64 496 R0 SYMATTR InstName R4 SYMATTR Value 100 SYMBOL res 368 480 R0 SYMATTR InstName R5 SYMATTR Value 44 SYMBOL res -336 272 R0 SYMATTR InstName R7 SYMATTR Value 330 SYMBOL cap 544 272 R0 WINDOW 3 -33 34 Left 0 SYMATTR Value 470p SYMATTR InstName C1 SYMBOL res 752 256 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R8 SYMATTR Value 33 SYMBOL voltage 1040 -48 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL pnp -16 144 R180 SYMATTR InstName Q4 SYMATTR Value 2N3906 SYMBOL npn 16 416 R0 SYMATTR InstName Q5 SYMATTR Value 2N3904 SYMBOL Digital\\schmtbuf 832 208 R0 WINDOW 3 -13 -15 Left 0 SYMATTR Value vhigh=5, td=5n, vt=2.5 vh=.7 SYMATTR InstName A3 SYMBOL res 1104 272 R0 SYMATTR InstName R6 SYMATTR Value 100 SYMBOL npn 336 304 R0 SYMATTR InstName Q6 SYMATTR Value BC847B SYMBOL schottky 448 272 R0 SYMATTR InstName D1 SYMATTR Value BAT54 SYMATTR Description Diode SYMATTR Type diode SYMBOL Digital\\buf 1008 208 R0 WINDOW 3 8 44 Left 0 SYMATTR InstName A1 SYMATTR Value vhigh=5, td=5n SYMBOL cap 192 528 R0 SYMATTR InstName C2 SYMATTR Value 1n TEXT -344 664 Left 0 !.tran 0 100u 1u 1u TEXT 696 144 Left 0 !.model Swi SW(Ron=1 Roff=10Meg Vt=2 Vh=-.5 Lser=10n ) TEXT 704 80 Left 0 !.option noopiter