HP AC-4A - AC-4 A Remote Readout Circuits; AC-4 A Staircase Output Circuit

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D.
•
•
•
REMOTE
READOUT
CIRCUITS
FOR
USE
WITH
AC-4A
The
staircase
output
voltage
from
base
Pin
8
of
the
AC-4A
Decade
Counter
Units
is
a
de
voltage
proportional
to
the
digit
indicated
by
the
AC
-4A.
This
voltage
can
be
used
to
operate
printing
systems
using
coin-
cidence
detectors
or
can
be
read
out
on
remotely
located
de
meters
or
ink
:recorders
using
the
circuits
shown
in
Fig.
6
or
Fig.
7.
AC-4A
STAIRCASE
VOLTAGE
EQUIVALENT
CIRCUIT
PIN
8
PIN
6
Fig.
5.
Staircase
Equivalent
Circuit
Staircase
voltage
output
is
between
base
Pin
8
and
GND.
The
load
on
the
staircase
output,
including
a
short,
has
no
affect
on
operation
of
AC-4A
Counter.
Rg
-
Approx.
700k
V - +
135v
count
of
O
to
+55v
count
of
9
in
approximately
equal
steps.
Tolerance
on
any
step
is
±1
volt.
The
staircase
output
voltage
will
vary
with
the
unregulated
+300
volt
supply
to
the
AC-4A's
•
The
staircase
voltage
can
be
+55
volts
at
count
of
ZERO,
+135
volts
at
the
count
of
NINE
if
Rl
1,
Rl4,
R2
7,
and
R38
in
the
Sche
-
matic
Diagram
of
Model
AC-4A
Decade
Counter
are
all
changed
to
the
opposite
plate
in
each
binary
.
-7-