HP AC-4A User Manual

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•
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•
APPLICATION
NOTE
4
<5/)
MODEL
AC-4A
DECADE
COUNTER
CONTENTS:
A.
Block
Diagram
of
Simple
Electronic
Counter.
B.
AC-4A
in
Basic
Electronic
Counter
Circuit.
C.
Driving
Circuit
for
AC-4A.
D.
Remote
Readout
Circuits
for
Use
with
AC-4A.
E.
Reset
Circuits
for
Use
with
AC-4A
•
HEWLETT
-PACKARD COMPANY •
1501
PAGE
MILL ROAD • PALO ALTO, CALIFORNIA, U. S.
A.

HP AC-4A Specifications

General

Brand	HP
Model	AC-4A
Category	Cash Counter
Language	English

Summary

AC-4A Decade Counter Block Diagram

AC-4A Basic Counter Circuit Operation

AC-4A Driving Circuit and Triggering

AC-4A Remote Readout Circuits

AC-4A Staircase Output Circuit

Describes the staircase output voltage proportional to the AC-4A's digit indication.

AC-4A Remote Readout with Ground Return

Details using a 50 µA meter with a ground return for remote readout.

AC-4A Remote Readout with DC Bucking Voltage

Explains using a DC 'bucking' voltage for standard meter compatibility.

AC-4A Reset Circuits

AC-4A Reset to Zero Circuit

Details a circuit using a 2D21 thyratron to reset counters to zero.

AC-4A Reset to Nine Circuit

Describes a circuit that resets all AC-4A counters to NINE.