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ORTEC 420 - Page 14

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5-2
over
a
range
of
approximately
1000
nanoseconds.
This
delay
should
be
quite
linear.
The
delay
generator
triggers
with
an
input
pulse
from
Q15
and
then
resets
when
the
signal
at
the
base
of
Q17
recovers
to
the
zero
voltage
level.
The
recovery
time
constant
is
set
by
capacitor
C19
and
the
constant
current
generator,
Q19.
The
pulse
from
the
col
lector
of
Q17
is
differentiated
and
the
negative
portion
is
fed
out
through
Q20
as
a
fast
output
signal.
An
inversion
of
this
some
signal
appears
at
the
collector
of
Q20
and
triggers
the
multivibrator
composed
of
Q21
and
Q22.
The
signal
from
the
collector
of
Q22
is
emitter-follower
buffered
to
the
output
as
a
positive
5-volt
signal,
0.5
micro
second
wide.
(
'■

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