Daystrom HEATHKIT HP-20 Instructions d'installation

Assem bly

and

Operation

of the

UTILITY

POWER

SUPPLY

MODEL HP-?O

HEA-- CCMPANY,

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Lfl 12/7 /62

TABLE OF CONTENTS

Specifications. .

Introduction... .....

Theory of Operation. . . .

Construction Notes.

Parts List. .

Proper Soldering Techniques

Step-By-Step Proeedure.

Step-By-Step Assembly. . .

Testing The HP-20 power Supply.

Operation.

In Case Of Difficulty. . .

Service Information. . . .

Service.

Replacements.

Shipping Instructions. . . .

Warranty.

Schematic.

tFold-out from this page.

7,N

A11 prices are subject to change without notice. The Heath

company reserves the right to discontinue instruments and

to_change specifications at any time without incuming any

obligation_to incorporate new ieafures in instrum""i"!""-

viously sold.

Copyrisht 1960

Heoth Compony

Page 2

SPECIFICATIONS

Power Requirements:. .

Overall Height:.

Total Continuous DC OutPut

Filament Power:.

Regulation (5070 load to 10070 load, from

hieh voltagetap):.....

Net Weight:. . .

Shipping Weight:.

11? volts AC, 50/60 cycles, 200 watts.

9" long, 4-3f 4" wide, 2-lf 4" high,

6" (with cover and four rubber feet).

1. 120 watts - 600 volts at 200 milliamperes

- or-

120 watts - 600 volts at 150 milliamperes

and 300 volts at 100 milliamPeres.

2. Bias - 130 volts at 30 milliamperes.

(Available in addition to above.)

6. 3 volts at 11 amperes, or

12. 6 volts at 5.5 amperes.

Approximately L0%.

12 lbs.

15 Ibs.

INTRODUCTION

The HEATHKIT Model HP-20 Utility Power

Supply was designed primarily to furnish all the

necessary power for HEATHKIT Mobile Trans-

mitters and Receivers, when they are used as

fixed station units.

Being a utility power supply allows it tobe used

to supply power to many other makes and types

of amateur equipment as well.

The Model HP-20 will supply a full 120 watts

of power, 600 volts at 200 milliamperes. A half

voltage tap (300 volts) is available for supply-

ing the receiver, or low leve1 stages of the

transmitter. In addition, 130 volts of negative

bias is available at a current rating (30 ma)

consistent with voltage regulator service. This

feafure allows use of the HP-20 Ydth SSB

equipment requiring regulated bias voltage.

The loads on the high and low voltage termi-

nals of the supply should be adjusted so that

the total power drain will not exceed 120

watts. A typical example would be a drain of

600 volts at 150 milliamperes from the high

voltage tap, which equals 90 watts. This would

leave 30 watts available at the low voltage tap,

or 300 volts at 100 miiliamperes. The total of

the two will equal the 120 watt rating of the

supply.

In event of a comptete short circuit in any of

the secondary circuits of the suppiy, two fuses

of the proper current rating afford adequate

proteetion.

The supply features excellent static regulation,

combined with the advantages of good dynamic

regulation, achieved through the use of high

value filter capacitors.

A full-wave voltage doubler circuit affordsgood

efficiency along with circuit economy. The

resultant ripple frequency is twice the source

frequency and, therefore, is easi.er to filter. A

further advantage is that each capacitor in the

doubler circuit requires a DC rating of only

half the output voltage, since the capacitors are

in series.

DAYSTROM

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VAC RMS

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FREOUENCY

-l 30 E

FREOUENCY

OPERATION

the output voltage is concerned.

Page 3

600

6.3

12.6

THEORY OF

The conventional voltag+-doubler circuit used in

this power supply ha.s been chosen because of

its efficiency, economy and circuit simplicity.

A voltage-doubler circuit wiII deliver a DC

output voltage approximately twice the rms

value of the secondary winding of the trans_

former. Under very high current drains, the

output voltage may be slightly under twice the

secondary voltage.

In operation, the filter capacitors Cb and C6

are each chargedto thepeak voltage of the trans-

former secondary on alternate traf cycles, but

with polarities such that the DC voliages de_

veloped across the capacitors add, in so far as

Due to the low ripple content existing in the

waveform immediately after rectification (the

ripple frequency being doubled, as well as the

voltage), a minimum of filtering is required.

This is accomplished with a simple resistance

1$ capacity network, consisting of Rl, R2,

C7, and C8. A half-wave rectifier is used in

the bias supply. The blas supply filter network

c.onsists of C9, R6, and C10 with R? serving as

the bleeder resistor.

Ia order to provide good dynamic regulation,

high value output filter capacitors are used.

CONSTRUCTION NOTES

This manual is supplied to assist you in every

rl'a:,- ro complete your kit with the teast possibll

cha-nce for error. The arrangement shown is

rhe result of extensive experimentation and

tr:al. Ii followed carefully, the result will be a

stalle instr:ument, operating at a high degree

:: :::;:.:a'bi1it"'. we suggest that you retain the

*-;--:' i- -'-.,* fil

_-- --.- _. .. _ ..: rrres for future reference, both

rr- *_r-: _s; _: :he instrument andfor its main_

--l;; -.-i: :*: ::T C.Tfi.EFULLY AND CHECK

:.:-_i-: :-r:.: .. ^..:.-,il THE PARTS LIST. Lr so

: :..: .: :;:ai.nted with the parts.

Refer to the charts and other information on the

inslde covers of the manual to help you identify

the components. If some shortage or parts

damage is found in checking the parts List,

please read the REPLACEMENT section and

supply'the inJormation called for therein. Include

all inspection slips in your Ietter to us.

R-esistors generally have a tolerance rating of

10/6 unless otherrvise stated in the parts List.

Tolerances on capacitors are generally even

greater. Limits of +tO1Vo and -2070 are common

for electrolytic capacitors.

L JNE

F IL TER STEP-UP

TRANSFORMER VOLTAGE-DOUBLER

RECTIFIER RESISTANCE

CAPACITANCE

FILTER

HALF- WAVE

RECTIFIER RESISTANCE

CAPACITANCE

FILTER

117 VAC

RV5 6C-,

Page 4

We suggest that you do thefollowingbefore work

is started:

1. Lay out all parts so that they are readily

available.

2. Provide yourself with good quality tools.

Basic tool requirements consistof ascrew-

driver with a t/4" blade; a small screw-

driver with a 1/8" blade; Iong-nose ptiers;

wire cutters, preferably separate diagonal

cutters; a penlmife or a tool for stripping

insulation from wires; a soldering iron (or

gun) and rosin core solder. A set of nut

drivers and a nut starter, while not neces-

sary, will aid extensively in construction

of the kit.

Most kit hrilders find it helpful to separate the

various parts into convenient categories. Muffin

tins or molded egg cartons make convenient

trays for small parts. Resistors and capac-

itors may be placed with their iead ends in-

serted in the edge of a piece of corrugated

PARTS

cardboard until they are needed. Values

be written on the cardboard next to each

component.

IMPORTANT NOTE: The #57-20 silicon diodes

supplied in this kit will meet all circuit re-

quirements, but may appear different than shown

in the parts pictorial and other sections of the

manual. The accompanying illustration shows

some of the silicon diode types that may be

supplied.

ANODE ENDS

, NE6ATLVE (-)

CATHODE ENI

POSiTIVE +)

PART

No. PARTS

Per Kit DESCRIPTION

220Alwattresistor

(red-red-brown)

100 KC} 1 watt resistor

(brown-black-ye11ow)

100O7wattwire-wound

1070 resistor

30 KO 25 watt wire-wound

center tapped resistor

.001 prfd GMV 1400 V disc

ceramic capacitor

125 p,fd 450 V twist prong

electrolytic capacitor

40 pfd 450 V electrolytic

hrbular capacitor

20+20 ptfd 150 volt capacitor

1-lug terminal strip

Z-Lug terminal strip

4-lug terminal strip

5-Iug terminal strip

3-lug terminal strip

3-1ug terminal strip, #B foot

Octal socket

L IST

PART

No.

346- 1

346-10

347-18 1

Metal Parts

200-M279F396

204-M198

205-M168F

Hardware

250-B 8

250-18

2 50- 56

250-89

250- 12 3

252-3

252-4

252-30

PARTS DESCRIPTION

Per Kit

Resistors-Capacitors

1A-19

1A-28

3G-9

3Y-3

2L-71

25-34

25-36

25-80

Plus-socket-Terminal Strips (Cont' d.)

438-11 1 Plug, AC fused

438-22 1 Octal plug

Wire-Cord-Sleevinq

ffiinecord

344-1 4 Length hookuP wire

Choke - Switch- T ransf ormer

45-L7 2 Line choke

54-109 1 Power transformer

61-1 1 SPST toggle switch

Plug- Socket- Ae t rI!44 J!!4_q

(1 each-black, orange,

yellow, red)

Length insulated sleeving

Length 3/8" fiber glass

sleeving

Length 8-conductor cable

C-:assis

[lounting bracket

Bottom plate

#6 x 3/8" BH sheet metal

screw

8-32 x 3,/8" RHMS

6-32 x 1/4" BHMS

6-32 x 3/8" BHMS

10-24 x 2-l/4" slotted hex

head screw

6-32 x 1,/4" nut

8-32x3 B"nut

10-2i :ex nut

431-1

431-2

431- 5

431-1 1

43t-27

431-33

434-39

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254-1 10

254-2 11

255-41 4

90- 10 1

261-6

391- 7

472-10

421-2

440-l

481-3

Miscellaneous

=10 fiber shoulder washer

t/2" x 3/16" flat rvasher

=6 I:.cr'.','asher

:6 iC,:..'.','a She r

Sj.licor recr,ifier (500 ma)

3/8" rui:oei {ronlmet

i / 16" rui,.'rel grommet

.:-R,T PARTS DESCRIPTION

I'r Per Kit

H=r'dware (Cont'd. )

PART PARTS DESCRIPTION

N!. Per Kit

Miscellaneous (Cont' d. )

Page 5

Cabinet cover

Rubber feet

Nameplate

Neon pilot light

3 amp fuse

Octal plug cap

Capacitor mounting wafer

(fiber)

Solder

Manual

1/4'' SPACER

#255-41

3/16" x 5/16"

RUBBER GFOMMET

s 13-4

57-20

?3- 1

73-4 1

1336- 1

595-363

6-32 NUT 8-32 NUT

#252 4

r - :, .i ::::: j10-24 NUT

#252-30

DUAL 20 pFD 150V

ELECTROLYTIC CAPACITOR

#25_80

OCTAL SOCKET

!434-39

F=+250-E!

fhss!

" 8-32 x 3 /8" RH-\IS

#250-18

$$sssn$ss$$sfifi$$ r

10-21 x 2 1/4"

SLOTTI]D HEX

HEAD SCREW

*250-723

#10 FIBER

1 "2 s : -: .: :ri;:l ffi

iFs* #6 x 3/B, BH

SHEET MET,{I SCRE\I'

#250 B

lOOO?WATTRESISTOR

#3G-9

OCTAL PLUG CAP

4440-7

--t-r-_ ;-'- a

--: =l=01:nl

. '!. t.-i.l,ti

3/8" x9/32,'

RUBBER GROMMET

001 lLfd

DISC 1400 voLT

CERAMIC

CAPACITOR

40 -::-: -

... H

\*r-f-''--. i,-, -l.:::-alaIEF

--r:-:

12r -id{50 VOLT

Eii.TFO LYTIC CAPACITOR

-25 34

:1.,:=:-' a,: - -

ffi

] :::;:I]

G L-r. S: : - : a 1,-I\ G

'311-:0 1-LUC

TERMINAL STRIP 3-LUG

TERMINAL STRIP

#431-27

d!H!}

r ILG

:J]:];.\I STRIP

'-M 11

4-LLG

?ERM1NAL STPIP

*431 t3_LUG

TERMINAL STRIP

#B Foot #431-33

2 LUG

TERMiNAI STRIP

4131-2

l,-rT i-:---, l,:il.

(-, =)

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PROPER SOLDERING

OnIv a small percentage of HEATHKIT e$rip- 3'

;;tit;;ffi;s'ers find it necessarv to return an

i;;i;"il;;a for factorv service' of-these instru-

'#i"ltE,' uv ; ^i- tr, " r i" ri e s t p o r t i on-o-t m alf uncti on s

are due io poor or improper soldermg'

If terminals are brightandcleanandfree of wax'

f";;;a insulation *a ott'u' foreign substances'

""'oiiii""itv will be experienced in soldering'

Correctly solderecl connections are essential if 4'

the performance engineered ilto .a kit is to be

irirv--*"tiir"a. If you are .a .le,sinner with no

"ruLri"""" in solaering, a haU hour's practice

*iif, "o*" odd lengths of wire may be a worth-

while investment.

For most wiring, a 30 to 100 watt iron or its

"q,ri"-"i&t in a so*idering gun is very satisfactory'

A'1o**" wattage iron than this may not heat the

"t""u"tio" eno'ugh to flow the solder smoothly

or.* tfr" joint. Keep the iron tip clean and bright

tr- *ipi"! it from time to time with a cloth' 5'

Page 6

CIIASSIS WIRING AND SOLDERIhG

TECHNIQUES

Leads on resistors, capacitors- a,nd similar

components are gene"afly much longerthan

il;y ;;;A to be "to mat<e the required con-

,r""lio"t. In these cases, theleadsshouldbe

ffi;;fier length before thepartis added

io -ttt" "fr""sis. t: general' the.leads -:,l?y]d

te lust long enough to reach their termrn-

ating points.

Wherever ttrere is apossibility r:f 'bar* teads

;h;"ti"g to other p*its o: ':r:rthe*ha*sis'the

i;;;t lhould be eove;eil x'rt!:: irrsulating

"i""ti"s. where the use oi sieeviug- is spe-

Iiircriiv'i"tended, the phrase "use sleeviRg"

i" it"i,ia"a in the asiociated construetion

step. Il:I any case where there is the pos-

tiuiirtv oi "r" unintentional short circuit'

;i;;;ils strouto be used. Extra sleeving is

provided for this Purpose'

Crimp or bend the lead (or leads) aroundthe

t-e*minri to form a good ioint without re-

iil;-;; solder for phvsical strength' If

iiJ'"*ir- it too iarge to allow lrending or if

;il; ;i;p siates trrat ttre wire is not to be

;;i*p-e, position the wire so that a good

t"iau" connection can still be made"

Unless otherwise indicated, all. wire used

;'th" type with colored insulation (hookup

;J, ttre size of the conductor is thesame

i;; ;n ;;;; of hookuP wires furnished with

it i" Lit. Inpreparing a Iength of hookup wire'

I /i" of insutation should be remcved from

"'""r, "rri ""Iess directed otherwise in the

construction steP.

To avoid breaking internal connect'ions when

"iripptns insulati-on frorn the leads of trans-

;;;;;#"r similar components,. ga1e should

;;iai<;; not to pu1l directlv on the igld' h-

"i""d,-iirfO the lead with pliers while it is

being striPPed.

6. Position the work, if possible, 3o that gravity

*iir r,.rp to keep ihe-solder where yor: want

it.

Place a flat side of the solciering iron tip

**ri".i *,. joint to be soldered until it is

;:;;- suttrcienttY to melt the solder'

Then place the solder against the heated

i""*i"tf and it rrill immediately flow over

ll\

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EEATHITIT'

IRemove the sold:r -i ihen the iron from

the completed j'.rr.c::-:. Use care notto move

the leads unril ::r s - iler is solidiJied,

CRIMP WIRES HEAT CO\}'ECTIO\ APPLY SOLDER

the joint; use only enough solder to thor-

oughly wet the junction. It is usually not

necessarj/ to f i11 the entire hole in the

terminal. cith solder.

COLD SOLDER JOINT

CO\f E C TIO\ INSUFFICIENT LY

HE.{TED

Page 7

A poor or cold solder joint wiII usually Iook

crystalline and have a grainy texfure, or the

solder will stand up in a blob and will not have

adhered to the joint. Such joints should be re-

heated until the soider flows smoothly over the

entire junction. In some cases, it maybeneces-

sary to add a little more solder to achieve a

smooth bright appearance.

ALLOW SOLDER

TO FLOW

PROPER SOLDER

CONNECTION COLD SOLDER JOINT

CONNECTION MOVED

WHILE COOLING

RosL\ Llar:.: :o--r:P. HAS BEEN SUPPLIED WITH THIS KIT. THIS TypE oF soLDER

\ltsf :: -,-::; FoF. .{LL SOLDERNG IN THIS KIT. ALL GUARANTEES ARE voIDED

A\D 'N'' ',i:- - \OT REP.{IR OR SER\IICE EQUIPMENT IN WHICH ACID CORE SOLDER

OR P.{S.: TI LXES HAVE BEEN USED. IF ADDITIONAL SOLDER IS NEEDED, BE SURE

TO PL?.CL:--ir RO'SINCORE (60:40 or 50:50 TIN-LEADCONTENT)RADIOTYPE SOLDER.

Page 8

STEP-BY.STEP PROCEDURE

The following instructions are presented in a

logieal step-by-step sequence to enable you to

complete your kit with the least possible con-

fusion. Be sure to read each step all the way

through before beginning the specified operation.

Also read several steps ahead of the actualstep

being performed. This will familiarize you with

the relationship of the subsequent operations.

When the step is completed, check it off in the

space provided. This is particularly important

as it may prevent errors or omissions, espe-

cially if your work is interrupted. Some kit

builders have also found it helpful to mark each

lead in colored pencil on the Pictorial as it is

added.

The fold-out diagrams in this manual may be

removed and attached to the waII above your

working area; but, because they are an integral

part of the instructions, they should be returned

to the manual a.fter the kit is completed.

In general, the itlustrations in this manual

correspond to the actual configuration of the

kit; however, in some instances the illustra-

tions may be slightly distorted to facilitate

clearly showing all of the Parts.

The abbreviation 'tNS, indicates that a con-

nection should not be soldered yet as other

wires will be added. When the iast wire is

installed, the terminal should be soldered and

the abbreviation "S" isusedto indicate this. Note

that a number will appear after each solder

instruction. This number indicates the number of

leads that are supposed to be connected to the

terminal in point before it is soldered. For

example, if the instruction reads, "Connect a

lead to lug 1 (S-2)," it will be understood that

there wilt be two leads connectedtotheterminal

at the time it is soldered. (In cases where a lead

passes through a terminal or lug and then con-

nects to another point, it will cotmt as two leads,

one entering and. one leaving the terminal.)

The steps directing the installation of resistors

include color codes to help identify the parts.

Also, il a part is identified by a letter-number

designation on the Schematic, its designation

wiil appear inthe construction step which directs

its installation.

EEAASET

lt7 v.

50-50 \

3 AMP FUSE LINE CHOKE BLACK

PI LOT

LICHT

.oot .ool UFD

.oot UFD .00t urD

3 AMP FUSE LINE CHOKE L|NE SwtTCH BLACK

L2 S1

BROWN

RED

'i--:,t-3-rE

EEN

t2.6V.-4 A.

JUMPER

6 3V-

JUve6P

I o:,-EA I

ll r/PFg

25a =t,,S 5 A-

a3"-4A

cro

@UFD

,TIFD

D3 D4

C7 + 125 LlFD

+ 40 UFD

loo J1 7w

roo_n- 7 w

+600v

+300v

100KJt

R3 AND R4

30K CENTER

TAPPED 25W

W IREWOUN D

RES ISTOR

+ l2s UFD

+40 UFD

NC -'130v

z?On lw

HEATHKTT

UTILITY POWER SUPPTY

MODET HP.20

)t,

tr:,'

B-rc +

-T.

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