Daystrom Heathkit IG-72 Manuel utilisateur

PRrCE $1.OO

..|

HEA.THKIT.

A'.SSEAITEII-Y N4A-1\TTJA,I-

GENERATOR

M()t)EL IG-72

AUDIO

The colored banrls aroud thebodyol a color coded lesistor reD-

lesent its valu€ in ohb6. These colored beds are grouled

tovald one end oi the resistor body. Sta*ing vitn this end

ot the resisto!, $e first land relresenk the flrst.jlgit of

the resbtuce velue; the decord bald represents the second

digit; the tllild bud repreBents the nuhbe! by which the fllst

two dglts ale muri&Ued, A foufih bald oI sold or silver rep-

lesents a tolelalce ol +5% or *10% respectively. The absence

of a foulill bdd indcates a tol€luce ol d0%,

RESISTOR AND

MICA

CAPACITOR

RESISTORS COLOR CODES

The lhysical size of a cohlosition leslstor ls related to itB

vattage rating. Size increases proglessively aE the pattage

;"'ff- ",;'J*ffi :"';Jx,llxfflili, 1'r,i,/,' jill, i"-t),?'.a

The colo! code chari dd examples whieh loUow prolide the

inlortuatio! requn'ed to ldentiir coior cod€d.€sistors,

EXAMPLES

YELLOW 4_

I rO\rJ '-\

i;:;' -- ' { 47'Lcoo

lb"ni-*'ce - to oo J I oR 47^o)

SILVER = TOLERANCE

t lo70

!209o

CAPACITORS

Gene.ally, only mica ad tlbu1a! ceramic capacitors, used

in mode.n equipment. ale color coded. The color codes (Mfe!

somevhat abong capactto. Eordacturers. however the codes

shoin !:::- :!!:: :: :.::i::-: :,- :: ::: :].a and tubular

..rr.:ri :rar: i: -.. ::ij..odes com-

.l: ,::: :. ::::::::::: :.:-!:::-: ..r! ::::r::) Stsdardsa

P::.: ::: :.::: : ::r.-: :: :::: : :.!::l:::.Eadlromlelt

CODE

:"=

(v^LUr rN,er rElorE 3 6.16{)

zloo*t t sq.

USING A PLASTIC NUT STARTER

r r, *iz

1v Lr. 'i 4.-s.. NorE I 3:Lor)

exllesBed in parts ler million pe. degree centigrade. Refe!

to EIA Studard, RS-198 (a Staldard oi Electronic Ind8t.les

3. The farad i3 the basic ult ol calacitance, howeve! c.!-

acltor values are genelally e)Alessed in telhs ol pld (Eicro-

falad, ,000001 farad) &d ]lpr (nicro-micro-farad, .000001

!ld), thereiole, 1,000 girf = .001 irfd, 1,000,000 pgf = lBfd.

NOTE

1. The chalacte.ktic ol a hica capaciior is the temper-

ature coerflcieni, .lrift calacitance and insulation resislmce.

This iorolmation is not usually needed to identily a capacitor

but, u desired, it c& be obtailed by r€Ielring to EIA Sted-

ard, AS-153 (a Standald of Electronic Industries Association.)

2. The temperature coefficient oi a calacitor is the predict-

able chuge in caleituce with temperatuie chdge ud i6

A plastic nut starter oflers a convenient method

oI stadiug ihe most used sizes: 3/16" ad r/4"

(3-48 and 6-32). when the co!.ect erd is pushed

dom over a !ut, the lliable tool contolms to the

shap€ ol the nut ud th€ nut is gently held white it

is being ptcked up dd siaded otr the screw. The

tool should only be used to start tie nut.

3-4

CODE

Isr DIGIT 2No DlclT MULTIPLIER

TOLERANCE

NO BANO leozr

ORANOE

CFEEN

VI OLET

WHITE

GOLD

SILVER

rqooo

loo,ooo

toco,ooo

r.ooo,ooo.ooo

6-32

-.^ -. ( 22 r TOO,OOO

E"cifru-oorooJ(oR 2 2 MEG.)

f Assembly

and

O pe ratio n

of the

AUDIO

G EN ERATOR

MODEL 1C.72

HEATH c:OMPANY,

BENTON HARBOR,

MICHIGAN

1 a subsidiaty ot

PAYSTRoM,,N

TABLE OF CONTENTS

Schematic. . .. .. ,. .2

SpeciJications.,..........,..3

Int.oduction. .....,......,.3

CircuitDescription, .........4

Step-By-Step Assembly Instructions., ..... . 5

Proper Soldering Procedure.,,..,,. .. ... 5

Metersub-Aasembly .....,,..10

Chassiswiring.,,.........11

Cycle Switch Sub-Aaaembly. . ...., . . .... 12

Attenuator Switch Sub-As8embly. ... . .. . . . 14

Iiitial Test And Adjustment........ . ... . 16

In Case Of Difiiculty ....... -.11

Application. ......17

Operation. -...-..11

Using The DB Scale, ........18

Accuracy,. ......19

Bibliography,,,.......,..,19

Replacements, .. ,... ..., .. .20

Service... ,...,..21

Shippinglnstructions ...,....21

warranty.. ......22

Parrs List, ,.-...23

10/25r63

rov

Lil

rAGEr

SCA

VOL

16 MFD

I 50V

PrLOT 6X4 6AU6 6CL6

3V IV .3V .IV

24o.(J. 390

.o3 v.orv .oo3v

r600 r 600

il 5V -3W

LAM P

OUTPUT

__l_

20 MFD

350V 5000

20w

LOAD

SW I TCH

ATTENUATO R

47c,0 |

f oK t/'

M ETER

CONTROL

,/T\lcz

_=L

SCHEMATIC OF THE

HEATHKIT @

AUDIO GENERATOR

MODET IG-7 2

VALUES OF C

MULTIPLIERICl lcZ

xl I .0, l.t

xlo Loos l .os

xloo Isool.oos

xlooo l+t lsoo

POWER

SWITCH

FULL

OUTPUT

VAt,UES OI.' II

DIAL R1 DIAL llt l)lAl, l(2 DIAI, Il2

l00K (i0

50K 70

33.3K ltO

2l-rK 1)0

20K 100

I (;.7K I

14.3K 2

12.5K 3

I l.lK 4

10.0K 5

I Mcg. 6

5l0K 7

33OK B

240K I

t94K 10

lti3K

139K

l22K

109K

OSCILLATOR

CONTROL

I@EEEEFT n""a

SPECIPICATIONS

Frequency Range:..... .....10 cycles - 100 kc

Tuning Method:.. ,............... Switch-selected,2 signilicant figures and multi-

plier.

Flequency Accuracy:. , . . . . , ,,,,,, ,...., ..,. +5%

Output Voltage Ranges:..... ...., , ...........0-10 volts into Hi-Z (10 KO min. )

0-3 volts into t{i-Z (10 KO min. )

0-1 volts \

0-.3 volts I Into external load of approx-

0-.1 volts ! imately 600Q or wilh inlernal

0-.03 volis I load into external Hi-2.

0-.01 volts I

o-.003 volts J

Source Impedance:.. , , . . . . . . . . . . 0 - 10 volt range - varies between 0 and 1000 O,

0-3 volt range - varies between 800 and 1000 O,

0-1 volt range and below - 600 Q (External Load)

290 r) (Internal Load)

DB Ranges:. . . . . . . . . .... -60 db to +22 db (-10 to +2 on meter. -50 to +20

on attenuator in l0 db steps).

DBll Rangea (600 O Ext. Load):. . . . . . . . . . . . . . -60 dbm to +2 dbm (0 dbm - I mw-600 f,))

O"rput Indication:. .......Voltage and db scaies on meter.

Oulput Mete! Accuracy: . . . . . , , . . . , , . . , . . . . . . +5% of full scale when properly terminated.

Distortionr, ..,.........., Le6s than 0.1q0 from 20-20,000 cycles.

Tube Complement:.. .....6X4, 6AU6 and 6CL6

Po*er Requirements:. , . .. . . . . . . . . . ..... .... 105-125 volts. 50-60 cycles, 40 watts

Dr:nensions:. . . . . . . . ..., I l/2" wide x 6 1/2" high x 5" deep

S:-rpping Weight:.... .. .. .8 lbs.

INTRODUCTION

The fieathktt Mode1 IG-72 Audlo Generator is a aimple, yet vefsetile lnstrument. lvhile simple

i'r ]ayout and easy to construct, the cer:efully assembled inatrument provldes ease of operation

in a multitude oI test setups encountered in audio laboratories. The wide range oI repeatable

irequencies and the metered Iow distortion output voltages covering nearly all values encoun-

rered in audio work contained in the conveniently small cabinet will entitle this instrument to a

preferred spot in the laboratory.

The excellent performance oI which this design is capable wiII not be realized in thefinished in-

strument, UNLESS the assembler uses the best workmanship of which he iE capable. Poor sol-

dering technique, corrosive fluxes (acid core, so-called ron-corrosive pastes), hurried and

careless constructionand failure tofollow procedures outlined inthis manual are the most pre-

valent causes for unsatislactory operation. Protect your investment in tlme and money andreap

the reward of personal satis(actionthat money cannot buy, by doing a Iirst class iob oI construct-

ing this kit.

p.e" I lii#EEl

CMCUIT DESCRIPTION

The circuit of tNs instrument may be divided into lour parts: the power supply, the oscillator,

the attenuator and the metering circuit.

The power supply uses the conventional power transformer lull wave rectilier circuit feeding a

,ipple filter consisting oI two condensers and a choke.

The oscillator uses a 6AU6 pentode voltage amplifier and a 6CL6 triode-connected cathode fol-

lower. R egene rative feedback fromthe 6CL6 tothe 6AU6 cathode is applied through thetungsten

filament candelabra based lamp-

Degenerative feedback is applied from the 6CL6

thiough a "notch" networkto the gridol the 6AU6.

The reaultant oscillation occurs at the "notchrl

frequency, where degeneration is minimum and

phase 6hift is zero.

network is a capacitor-shunted

bridged-T tlpe. The "notch" occurs at a fre-

quency: F =1

'frRE'

\a,he.e C =r/e-1c2

'fhe amplitude oI oscillation is maintained at a

nearly constant value by thetungsten lamp. The

regenerative feedbac k is applied through a volt-

age divider consistingof the iamp and the "oscil-

lator" control. An increase in output signal in-

creases the lamp current, the Iamptemperature

andthe lamp resistance. This reduces the amount

of leedback applied to the 6AUO cathode and the

resultant output. A balanced condition is thus obtained. The "oscillator"

control Is used to set the nominal output level.

The ,notcht! network consists basically oI two resistances and two con-

densera. From the relationship shown it is evident that a decrease in

capacitiesby a factor oI 10 willincrease the frequency by a lactor oI 10.

As the values of C1 and C2 were chosen with a 10:1 ratio, Iive conden-

6ers can do the job oi fou! pair or eight, in achievinglou! decade ranges.

f'or flequency variationwithin th€ steps oI 10 times provided by the multiplier switch, the value

of R is changed. For a multiplier switch setting oI Xl a resistance (R) of 100 KA v,/ill produce

a lrequency of l0 cycles. As F and R are inversely proportional, 20 cycles or twice the fre-

quency, requires half the lesistance, or 50 KQ- Likewise, 30 cycles or three times the fre-

quency requires l/3 the resistance or 33.3 KQ. The 0-100 "cycle" switch uses two decks, each

deckswitchingfour resistorsas lollows: 100 K0, 50 K0,33-3 K0. 25 K{1. l0O K // 25 K = 20 K;

50K // 25K = 1r'.7 K; 33.3 K // 25K = 14.3 K; r00 K // 33.3 K / 25 R = 12.5 K; 50 K // 33.3 K

//25IK=ll.1K:' l0OK // 50K //33.3K//25K= 10 K. These resistance values produce {re-

quencies of 10 to 100 cycles in steps of l0 cycles. \// means "in parallel lrith.')

. L______1_t__i_r ;";*,.,

P.d- q

. !:-r-

: .quency variations within a 10 cycle spaD are produced by the 0-10 "cycle" switch. Here the

:::rereasoning andcircuitry areused as abovebut the actual resistance valuesare substantially

'- : rimes larger. These resistance values are connected in paraUel with the first switch arld

:i luce one cycle iDcrements.

: . attenuator reduces the output voltage lrom the 6CL6 cathode-Iollower through a continuously

-rrable 5 KQ "output" control, and then through a step attenuator. The attenuator system is

:.iiqned for 600 A output up tfuough 1 volt and high impedance output at the 3 and 10 volt posi-

:is. The 600 Q positions may be terminated by an internal Ioad lor high impedance work or

.iloadmay be disconnected when anexternal 600Q Ioad is used. In the 3 and 10 voltpositions,

' rnternal load is automatically disconnected. The attenuator operates in steps of 10 db.

: . metering circuit measures the voltage at the arm of the "output" control. A portion of this

.rge, determined by the "meter" control, is rectified by a half-bridge using crystal diodes.

\ rr-linearity of the diodes at Iow signal level is compensated by a third diode across the tneter.

: . meter carlies three scales: 0-10 volt, 0-3 volt, and -10 to +2 db. When the instrument is

!:r'a1ed with the proper termination, the meter and attenuator will indicate the output level at

-: rinding posts.

STEP.BY-STEP ASSEMBLY INSTRUCTIONS

i ,:rr o[ parts can be assembled into the finished product in a variety of ways; Irom pictorials,

-_. Iographsor from circuitdiagram alone. However, evenexperiencedand skilled professional

: :sons have discover:ed that a combination of pictorials and step-by-step written instructions

::: rlide the lastest, most convenient way. This also guards against the disappointment o, fail-

-:'E iooperate alter construction is completed, due to a singte minor hard-to-find omission.

::.e written assembly instructions in this manual are divided into small operations or steps.

:'.h step is a complete operation. Read the entire step through, then do that operation and

.i.k it off as completed. Alter aD interruption, it is easy to find where you left off by the

...ck marks. Read over the last checked step and you are all ready to continue.

:_ Ihe mechanical assembly, use lockwashers under all 6-32 nuts and between aII controls or

:; rtches and the mounting surface.

:: :he wiring (S) means solder this connection and (NS) means do not solder yet, as more wires

: ll be connected to this point. lI more than one wire is to be soldered at a connection point,

:-. instructions wiII appear as follows (S) (3) which means solder this connection which should

:.:-.'e three wires connected to it. This will provide a runDing check of multiple connections.

PROPER SOLDERING PROC EDURE

Or:v a small percentage of Heathkit purchasers find it

:: rrrry service. Of these, by far the Iargesi proportion

:::proper soldet'ing.

,- :re(t soldel.ing technique is extlenrelr-' impoIraDl. Good soldcr join(s ar. css{'nlial il' thc

rrriornrance engincel.ed into the kil js to be iully relljzcd. ll you ]r.. .l beginDel. wilh no ox-

!.irer)ce in soldering, a half-hour"s practice with odd loDgths oi wjr-. and a lubc so(kol will bo

., ror-thwhile investn1ent.

necessary to retuln an instrument ior

function improperly because of poor or

n.*"u @EEFI

ROSIN CORE SOLDER HAS BEEN SUPPLIED WITH THIS KIT. THIS TYPE OF SOLDER

MUST BE USED FOR ALL SOLDERING IN THIS KIT. ALL GUARANTEES ARE VOIDED

AND WE WILL NOT REPAIR OR SERVICE EQUIPMENT IN WHICH ACID CORE SOLDER

OR PASTE FLTIXES I]AVE BEEN USED. IF ADDITIONAL SOLDER XS NEEDED, BE SURE

TO PURCIIASE ROSINCORE (60i40 or 50:50 TIN- LEAD CONTENT) RADIO TYPE SOLDER.

II terminals are bright and clean and wires free of wax, frayed insulation and other foreign sub-

stances, no difliculty will be experienced in soldering. Crimp or otherwise secure the wire

(or wires) to the terminal, so that a good joint is made without relying on solder Ior physical

strength. To make a good solder joint, the clean tip of the soldering iron should be placed

against the joint to be soldered so that the terminal is heated sufficiently to melt solder. The sol-

der is then placed against both the terminal and the tip of the iron and will immediately flow out

over thejoint. Referto the sketch below. Use only enough solder to cover wires at thejunction;

it is not necessary to fill the entire hole in the terminal with solder. Excess solder may flow

into tube socket contacts. ruining the socket, or it may creep into switch contacts and destroy

theirspringaction. Position the work sothat gravity tends tokeep the solder whete lou \r'ant it.

I@EEEEEEEBT n"'u'

A poor solder j oint will usually be indicated by its appearance.

The solder will stand up in a blob on top oI the connection,

with no evidence of flowingout caused by actual "wetting"of

the contact. A crystalline or grainy texture on the solder

surlace, caused by movement of the joint belore it solidified

is another evidence oI a "cold" connection. In either event,

reheat thejoint until the solder flows smoothly over the en-

tire junction, cooling to a smooth bright appearance. Photo-

graphs in the adjoining picture clearly indicate these two

characteristics.

A good, clean, weII-tinned soldering iron is also important

to obtain c ons i stently perfect connections. For most wiring,

a 25 to 100 watt iron, or the equivalent in a soldering gun,

is very satisfactory. Smaller irons generally wiII not heat the connections enough to flow the

solder smoothly overthe joint and are recommendedonly lor light work, such as on etched cir-

cuit boards, etc. Keep the iron tip clean and bright. A pad of steelwool may be used to wipe

the tip occasionallv during use.

Take this precaution and use reasonable care during the assembly of the kit. This will inaure

the wonderful satisfaction of having the instrument operate perfectly the Iirst time it is turned

^-" o

",frTJ"',lth.

to"mq'

.\g

PICTORIAL 1

OOO

P"su8 r-@E4EEEl

Pictorial 2

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