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BRUEL & KJAER 1621 - Frequency Tuning Circuit, Auto

BRUEL & KJAER 1621
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Technical
Description
1621
1
FREQ<
TUNING
Filt.r
~~nU_Q_l
____
~~
______
~
~
-'
Tuning
Vol
toge
rx
Auto
Ramp<
Synt
< putsos
COllOlor
Gen
<
Stor!
I
Ck
Re.et
Stop
FF
from
Le
...
eL
Rtcordtr
Decoder
for
one
Decode
Frequency Tuning
Circuit,
Auto
This
circuit
will
start
paper
movement
of
alevei
Recorder,
when
SWEEP
CONTROl
is
pressed
down
to
"Start"
During
movement
of
the
paper,
sync<
pulses
will
be
applied
to
1621
These
pulses
clock
up
a
Counter,
when
the
number
of
pulses
are
equal
10
one
decades
movement
of
the
paper a
Decoder
will
reset a
Start/Stop
Flip-Flop
and
thus
the
paper
movement
will
stop<
The
output
of
the
Counter
is
also
applied
to a
Ramp
Circuit
which
will
generate
a
voltage
for
tuning
the
Filter
in
synchronization
with
the
paper
movement
9<77
Valid
from
se ria I
no<
6941
26
r

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