Heathkit HWA 7 1 Manual

Page 1

Assembly and Operation TABLE OF CONTENTS

Introduction
Of '1 e Parts List
Stepby-Step Assembly

Chassis Parts Mounting ....................
Chassis Parts Wiring

Alternate Line Voltage Wiring .................

ACCESSORY Final Assembiv

Specifications

POW ER su PPLY Liaifleilirféflxce
MODEL HWA-7-1

Circuit Description

HEATH COMPANY Copyughtip1972
BENTON HARBOR. MICHIGAN 49022 ""°°"""""

Allndm reserved

Page 2

Page 2

INTRODUCTION

The Heathkit Model HWA-7-1 Accessory Power Supply is a low-voltage, well
regulated DC power supply. It was designed to provide +13.0 VDC, primarily to
power the Heathkit Model HW-7 Low Power CW Transceiver from an AC power
source. The Power Supply can be wired for operation from a 120 or 240 VAC
power line and still maintain its specified regulation. Applications for this
Accessory Power Supply are almost limitless in this age of low-voltage solid-state

PARTS

Check each part against the following list. The numbers correspond to the
numbers in the Parts Pictorial (fold-out from Page 3).

NOTE: Any part that is packaged in an individual envelope with its part number
on it should be placed back in the envelope after it is identified until it is called
for in a step.

KEY PART PARTS DESCRIPTION

No. No. Per Kit

ELECTRICAL PARTS

A1 142 1 270 (2, 1/2-watt
(red-violet-brown) resistor

A2 12-1 1 1000 Q, I-watt (brown-
black-red) resistor

A3 56-32 1 VR-13.6 zener diode

A3 57-27 2 1N2071 diode

A4 417-101 1 TA2577A transistor

A5 25-154 1 2500 pF electrolytic capacitor

circuits. Its rugged construction and reliable performance will provide years of
dependable service.

NOTE: Refer to the Kit Builders Guide" for complete infomiation on
unpacking, parts identification, tools, wiring, soldering, and step-by-step
assembly procedures.

LIST

To order a replacement part. use the Parts Order Form fumished with this kit. If a
Parts Order Form is not available. refer to "Replacement Parts" inside the rear cover
of the Manual. For pricing information. refer to separate "Heath Parts Price List."

KEY PART
No. No.

PARTS
Per Kit

DESCRIPTION

Electrical Parts (Cont'd.)

A6 421 ~33 1 1/4-ampere slow-blow
fuse
A7 60-70 1 Slide switch
54-233 1 Power transformer
MECHANICAL PARTS
81 204-689 1 Transistor bracket

Page 6

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é SCREW

Detail 2C

NOTE: POSITION
OF THE LUGS

Detail ZD
( ) Mount 3 terminal strip at B with 6-32 x 1/4" hardware esshown in Detail
2C. Be sure the terminal strip foot is positioned correctly.
i ) Mount the remaining terminal strip at C in a similar manner with 6-32 x l ) Refer to Detail 20 and mount the slide switch to the chassis at D with two

1/ " hardware. Be sure the terminal strip is positioned correctly. 6-32 x l/ " screws. Be sure the lugs of die switch are positioned correctly.