Vectronics VEC-821K - Manual

TABLE OF CONTENTS
Introduction....................................................................................................................2
Tools and Supplies .......................................................................................................2
Before You Start Building ............................................................................................3
Soldering Tips:...............................................................................................................3
Desoldering Tips:..........................................................................................................4
Work Habits:..................................................................................................................4
Sorting and Reading Resistors:...................................................................................4
Reading Capacitors:......................................................................................................5
Diodes:............................................................................................................................5
Transistors:.....................................................................................................................6
Integrated Circuits:........................................................................................................6
Parts List ........................................................................................................................7
Parts Placement Diagram..............................................................................................8
S t e p -By -Step Assembly ........................................................................................8
Phase 1: ...........................................................................................................................9
Phase 2:..........................................................................................................................11
Phase 3:..........................................................................................................................14
PC Board Inspection:...................................................................................................16
Testing and Alignment ...............................................................................................17
Operating Instructions ...............................................................................................18
Receiver or Scanner Operation ..................................................................................18
In Case of Difficulty ....................................................................................................19
No Signal Filtering:.......................................................................................................19
Intermittent Filter Operation:...................................................................................... 19
Filter Stops Filtering:....................................................................................................19
No Speaker Audio:.......................................................................................................20
Theory of Operation and Specifications .................................................................20
Circuit Description:......................................................................................................20
Specifications:..............................................................................................................20
Enclosure ......................................................................................................................20
Schematic .....................................................................................................................21