Version 4
SHEET 1 2740 2480
WIRE 2208 1872 2064 1872
WIRE 2064 1888 2064 1872
WIRE 1920 1936 1920 1920
WIRE 2064 1984 2064 1968
WIRE 2208 1984 2208 1872
WIRE 1808 2048 1776 2048
WIRE 1920 2048 1920 2016
WIRE 1920 2048 1872 2048
WIRE 2032 2048 1920 2048
WIRE 2160 2048 2032 2048
WIRE 1920 2064 1920 2048
WIRE 2032 2064 2032 2048
WIRE 1920 2144 1920 2128
WIRE 2032 2144 2032 2128
WIRE 2208 2144 2208 2080
WIRE 2208 2144 2032 2144
WIRE 2032 2160 2032 2144
WIRE 2208 2160 2208 2144
WIRE 1920 2224 1920 2208
WIRE 2032 2256 2032 2224
WIRE 2208 2256 2208 2240
WIRE 1920 2336 1920 2304
FLAG 1920 2336 0
FLAG 2032 2256 0
FLAG 2208 2256 0
FLAG 2064 1984 0
FLAG 1920 1920 0
FLAG 1776 2048 0
SYMBOL NJF 2160 1984 R0
SYMATTR InstName Q1
SYMATTR Value 2N3819
SYMBOL res 2192 2144 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL cap 2016 2064 R0
SYMATTR InstName C1
SYMATTR Value 47p
SYMBOL cap 2016 2160 R0
SYMATTR InstName C2
SYMATTR Value 68p
SYMBOL VOLTAGE 2064 1872 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL Misc\\xtal 1904 2064 R0
SYMATTR InstName X1
SYMATTR Value 20f
SYMATTR SpiceLine Rser=50 Lser=12.7m Cpar=3.5p
SYMBOL cap 1936 2144 M0
SYMATTR InstName C5
SYMATTR Value 100p
SYMBOL res 1904 1920 R0
SYMATTR InstName R3
SYMATTR Value 220k
SYMBOL voltage 1920 2208 R0
WINDOW 0 33 66 Left 2
WINDOW 3 -243 101 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 1k 1u 10n 10n 10n 0 1)
SYMBOL diode 1872 2064 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
TEXT 1608 1920 Left 2 !.tran 0 5m 100u 1n
TEXT 1608 1952 Left 2 !.options method=trap