User Guide

After Sales
Technical Documentation
Compact Handsfree Unit PHF–2
Page 3Original, 11/94
COMPACT HANDSFREE UNIT PHF–2
CONTENTS
Page No
Introduction 5
Technical Summary 5
List of Modules 5
Technical Specifications 6
Modes of Operation 6
Maximum Ratings 7
DC Characteristics 7
Control Signals 8
AC Characteristics 8
External Signals and Connections 9
Mechanical Characteristics 9
Functional Description 10
Circuit Description 10
Input Circuit 10
Power Control Logic 12
Switched Mode Power Supply 12
Audio Circuit 12
Assembly 14
Assembly Parts 15
Parts List 15
List of Figures
Figure 1 Block Diagram 10
Figure 2 Component Layout Diagram 11
Figure 3 Cable Interconnection Diagram 13
Figure 4 Exploded View 14
Figure 5 Circuit Diagram 19