Version 4
SHEET 1 1144 1448
WIRE -2720 16 -3104 16
WIRE -2544 16 -2720 16
WIRE -3104 64 -3104 16
WIRE -2720 112 -2720 16
WIRE -2544 112 -2544 16
WIRE -3104 192 -3104 144
WIRE -2928 192 -3104 192
WIRE -2544 224 -2544 192
WIRE -3104 240 -3104 192
WIRE -2720 240 -2720 192
WIRE -2720 240 -2864 240
WIRE -3104 352 -3104 304
WIRE -3104 352 -3248 352
WIRE -2720 352 -2720 240
WIRE -2544 352 -2720 352
WIRE -3248 400 -3248 352
WIRE -3104 400 -3104 352
WIRE -2720 400 -2720 352
WIRE -2928 448 -2928 288
WIRE -2784 448 -2928 448
WIRE -2544 560 -2544 432
WIRE -3248 640 -3248 480
WIRE -3104 640 -3104 464
WIRE -3104 640 -3248 640
WIRE -3104 768 -3104 640
WIRE -2720 768 -2720 496
FLAG -2544 224 0
FLAG -2720 768 0
FLAG -3104 768 0
FLAG -2544 560 0
SYMBOL voltage -2544 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 3
SYMBOL npn -2784 400 R0
SYMATTR InstName Q2
SYMATTR Value 2N3904
SYMBOL pnp -2864 288 R180
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res -2736 96 R0
SYMATTR InstName R1
SYMATTR Value 5K
SYMBOL res -3120 48 R0
SYMATTR InstName R3
SYMATTR Value 1MEG
SYMBOL cap -3120 400 R0
SYMATTR InstName C1
SYMATTR Value 1000pf
SYMBOL res -2560 336 R0
SYMATTR InstName R2
SYMATTR Value 5K
SYMBOL res -3264 384 R0
SYMATTR InstName R4
SYMATTR Value 2MEG
SYMBOL schottky -3120 240 R0
SYMATTR InstName D1
SYMATTR Value BAT54
SYMATTR Description Diode
SYMATTR Type diode
TEXT -3064 -216 Left 2 !.tran 0 1500m 0 50u startup
TEXT -3008 600 Left 2 ;David Pilling 2015
TEXT -3456 -24 Left 2 ;Based on "Astable Unijunction Transistor Multivibrator, E Keonjian and J J Suran" in Handbook of Semiconductor Circuits