Version 4 SHEET 1 1388 1988 WIRE -720 1296 -768 1296 WIRE -720 1328 -720 1296 WIRE -720 1440 -768 1440 WIRE -720 1440 -720 1408 WIRE -720 1568 -720 1440 WIRE -720 1712 -720 1664 WIRE -704 592 -752 592 WIRE -704 624 -704 592 WIRE -704 736 -752 736 WIRE -704 736 -704 704 WIRE -704 864 -704 736 WIRE -704 1120 -704 960 WIRE -704 1184 -704 1120 WIRE -624 912 -640 912 WIRE -624 928 -624 912 WIRE -624 1040 -624 992 WIRE -624 1120 -704 1120 WIRE -624 1120 -624 1104 WIRE -624 1616 -656 1616 WIRE -576 1296 -720 1296 WIRE -576 1488 -576 1296 WIRE -576 1616 -624 1616 WIRE -576 1616 -576 1568 WIRE -544 1616 -576 1616 WIRE -512 912 -624 912 WIRE -464 592 -704 592 WIRE -464 784 -464 592 WIRE -464 912 -512 912 WIRE -464 912 -464 864 WIRE -464 1440 -720 1440 WIRE -464 1616 -480 1616 WIRE -432 912 -464 912 WIRE -400 1440 -464 1616 WIRE -400 1616 -464 1440 WIRE -384 1616 -400 1616 WIRE -352 736 -704 736 WIRE -352 912 -368 912 WIRE -288 736 -352 912 WIRE -288 912 -352 736 WIRE -288 1296 -576 1296 WIRE -288 1488 -288 1296 WIRE -288 1616 -320 1616 WIRE -288 1616 -288 1568 WIRE -272 912 -288 912 WIRE -240 1616 -288 1616 WIRE -208 1616 -240 1616 WIRE -176 592 -464 592 WIRE -176 784 -176 592 WIRE -176 912 -208 912 WIRE -176 912 -176 864 WIRE -144 1296 -288 1296 WIRE -144 1328 -144 1296 WIRE -144 1440 -400 1440 WIRE -144 1440 -144 1408 WIRE -144 1568 -144 1440 WIRE -144 1712 -144 1664 WIRE -128 912 -176 912 WIRE -96 1440 -144 1440 WIRE -48 912 -128 912 WIRE -48 928 -48 912 WIRE -48 1040 -48 992 WIRE -48 1120 -48 1104 WIRE -16 912 -48 912 WIRE 48 400 48 352 WIRE 48 528 48 480 WIRE 48 592 -176 592 WIRE 48 624 48 592 WIRE 48 736 -288 736 WIRE 48 736 48 704 WIRE 48 864 48 736 WIRE 48 1120 -48 1120 WIRE 48 1120 48 960 WIRE 48 1184 48 1120 WIRE 80 352 48 352 WIRE 96 736 48 736 WIRE 192 1296 144 1296 WIRE 192 1328 192 1296 WIRE 192 1440 144 1440 WIRE 192 1440 192 1408 WIRE 192 1568 192 1440 WIRE 192 1712 192 1664 WIRE 288 1616 256 1616 WIRE 336 1440 192 1440 WIRE 336 1488 336 1440 WIRE 336 1616 288 1616 WIRE 336 1616 336 1568 WIRE 368 1616 336 1616 WIRE 448 1440 336 1440 WIRE 448 1616 432 1616 WIRE 512 1440 448 1616 WIRE 512 1616 448 1440 WIRE 528 1616 512 1616 WIRE 624 1440 512 1440 WIRE 624 1488 624 1440 WIRE 624 1616 592 1616 WIRE 624 1616 624 1568 WIRE 672 1616 624 1616 WIRE 704 1616 672 1616 WIRE 768 1296 192 1296 WIRE 768 1328 768 1296 WIRE 768 1440 624 1440 WIRE 768 1440 768 1408 WIRE 768 1568 768 1440 WIRE 768 1712 768 1664 WIRE 816 1440 768 1440 FLAG 48 1184 0 FLAG -704 1184 0 FLAG 48 528 0 FLAG -752 736 out1 IOPIN -752 736 Out FLAG 96 736 out2 IOPIN 96 736 Out FLAG -512 912 b1 FLAG -128 912 b2 FLAG -752 592 VCC IOPIN -752 592 In FLAG 80 352 VCC IOPIN 80 352 Out FLAG -144 1712 0 FLAG -720 1712 0 FLAG -768 1440 out10 IOPIN -768 1440 Out FLAG -96 1440 out20 IOPIN -96 1440 Out FLAG -624 1616 b10 FLAG -240 1616 b20 FLAG -768 1296 VCC IOPIN -768 1296 In FLAG 768 1712 0 FLAG 192 1712 0 FLAG 144 1440 out100 IOPIN 144 1440 Out FLAG 816 1440 out200 IOPIN 816 1440 Out FLAG 288 1616 b100 FLAG 672 1616 b200 FLAG 144 1296 VCC IOPIN 144 1296 In SYMBOL RES -720 608 R0 SYMATTR InstName R1 SYMATTR Value 2.2k SYMBOL res 32 608 R0 SYMATTR InstName R2 SYMATTR Value 2.2k SYMBOL res -480 768 R0 SYMATTR InstName R3 SYMATTR Value 101K SYMBOL res -192 768 R0 SYMATTR InstName R4 SYMATTR Value 100K SYMBOL cap -368 896 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value .01µ SYMBOL cap -208 896 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C2 SYMATTR Value .01µ SYMBOL VOLTAGE 48 384 R0 SYMATTR InstName V1 SYMATTR Value 9 SYMBOL NPN -16 864 R0 SYMATTR InstName Q2 SYMATTR Value 2N3904 SYMBOL npn -640 864 M0 SYMATTR InstName Q1 SYMATTR Value 2N3904 SYMBOL diode -640 928 R0 SYMATTR InstName D1 SYMATTR Value Dbd SYMBOL diode -64 928 R0 SYMATTR InstName D2 SYMATTR Value Dbd SYMBOL diode -640 1104 M180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D3 SYMBOL diode -64 1104 M180 WINDOW 0 24 72 Left 0 WINDOW 3 24 0 Left 0 SYMATTR InstName D4 SYMBOL RES -736 1312 R0 SYMATTR InstName R10 SYMATTR Value 2.2k SYMBOL res -160 1312 R0 SYMATTR InstName R20 SYMATTR Value 2.2k SYMBOL res -592 1472 R0 SYMATTR InstName R11 SYMATTR Value 101K SYMBOL res -304 1472 R0 SYMATTR InstName R21 SYMATTR Value 100K SYMBOL cap -480 1600 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C10 SYMATTR Value .01µ SYMBOL cap -320 1600 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C20 SYMATTR Value .01µ SYMBOL NPN -208 1568 R0 SYMATTR InstName Q20 SYMATTR Value 2N3904BRK SYMATTR Prefix X SYMBOL npn -656 1568 M0 SYMATTR InstName Q10 SYMATTR Value 2N3904BRK SYMATTR Prefix X SYMBOL RES 176 1312 R0 SYMATTR InstName R100 SYMATTR Value 2.2k SYMBOL res 752 1312 R0 SYMATTR InstName R200 SYMATTR Value 2.2k SYMBOL res 320 1472 R0 SYMATTR InstName R101 SYMATTR Value 101K SYMBOL res 608 1472 R0 SYMATTR InstName R201 SYMATTR Value 100K SYMBOL cap 432 1600 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C100 SYMATTR Value .01µ SYMBOL cap 592 1600 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C200 SYMATTR Value .01µ SYMBOL NPN 704 1568 R0 SYMATTR InstName Q200 SYMATTR Value 2N3904BRK SYMATTR Prefix X SYMBOL npn 256 1568 M0 SYMATTR InstName Q100 SYMATTR Value 2N3904BRK SYMATTR Prefix X TEXT -832 472 Left 0 !.tran 0 10m 0 1u startup TEXT -832 248 Left 0 ;A Real Model Of The Astable Oscillator TEXT -520 472 Left 0 !.model Dbd D(Bv=5.4 Ibv=1mA Rs=20) TEXT -832 304 Left 0 ;Vbe breakdown added to the transistor. TEXT -832 336 Left 0 ;Watch V(b1). It's limited to about -6V. TEXT -832 504 Left 0 !.options plotwinsize=0 TEXT -520 440 Left 0 ;I guessed Rs=Rb of the 2N3904. TEXT -576 568 Left 0 ;Vbe breakdown model with external diodes TEXT -816 1768 Left 0 !.subckt 2N3904BRK 1 2 3\nQ1 1 2 3 2N3904\nD1 2 4 Dbd\nD2 3 4 D\n.model Dbd D(Bv=5.4 Ibv=1mA Rs=20)\n* I guessed Rs=Rb of the 2N3904\n.ends TEXT -744 1272 Left 0 ;Using a subcircuit model(2N3904BRK) with Vbe breakdown TEXT -832 368 Left 0 ;The breakdown diodes are embedded in a subcircuit in the second example. TEXT -832 392 Left 0 ;Both circuits are 100% equivalent. TEXT -360 1776 Left 0 ;The prefix has been changed to X for both transistors. TEXT -360 1816 Left 0 ;1. Move the cursor over the transistor. TEXT -360 1848 Left 0 ;2. Press Ctrl+RightMouseButton TEXT -360 1880 Left 0 ;3. Change Prefix: QN to X TEXT 168 1272 Left 0 ;Using a subcircuit model(2N3904BRK) with Vbe breakdown TEXT 168 1240 Left 0 ;This version has a guaranteed selfstart! TEXT -744 1240 Left 0 ;There is a small chance that it doesn't start. RECTANGLE Normal -544 1152 -784 832 RECTANGLE Normal 128 1152 -96 832