Heathkit HD-10 User manual

and
Operation
of the
ELECTRONIC KEYER
MODEL HD-10
HEATH COMPANY
BENTON HARBOR,
MICHIGAN
TABLE OF CONTENTS
Introduction. ......................
Parts List. ........................
Step-By-Step Assembly
I
........... Circuit Board Assembly.
........ Parts Mounting-Cabinet Top.
..............
Wiring-Cabinet Top.
........... Transistor Installation.
Key-Mechanical Assembly.
....... ,115
Switch Adjustment. .............
Final Wiring. .................
Right-Hand Operation. .............
Left-Hand Operation. .............
Initial Test And Adjustment. ..........
..................
Final Assembly.
Installation And Operation.
...........
In Case Of Difficulty. ...............
..............
Troubleshooting Chart.
Specifications.
....................
................
Circuit Description. 35
Circuit Board X-Ray Views.. ......... 41
....
...
Schematic. (fold-out from s age). 43

Page 2
cm-a
INTRODUCTION
The HeathkitModelHD-10 ElectronicKeyer uses
solid-state (transistor) circuitry to provide
clean, "bounce-free" keying. It will produce
self-completing dots and dashes at speeds ad-
justable from
15 to over 60 words per minute.
(Alternate connections provide a speed range of
10 to 20 words per minute.)
Transmitters that use grid-block keying, or
other types of keying where a negative (bias)
voltage
is shorted to ground to key the trans-
mitter, can be used with the Electronic Keyer.
A built-in audio generator and speaker allows
you to monitor the keying of the transmitter.
Also a speaker-muting headphone jack ispro-
vided in case you prefer to use headphones for
monitoring. When using headphones you can
also listen to the received signal without exter-
nal switching. Screw terminals areprovided on
the rear of the Electronic Keyer for connecting
to the headphone output of the receiver.
Keying is accomplished with a keying lever and
two small snap-action switches, onefordotsand
the other for dashes. For dots, the keying lever
is moved to the right; for dashes, the keying
lever
is moved to the left. This keyingsequence
can be reversed by simply reversing the con-
nections to the snap-action switches.
The Hold position of the slideswitchcanbe used
to continuously key the transmitter fortuning or
other adjustments. Also, you can connect a
straight or speed key to the Electronic Keyer
for conventional nonautomatic keying.
b
Normally, the Electronic Keyer is operated
from a standard 105 to 125volt AC line. How-
4
ever, there are provisions for battery opera-
tion for emergency service. Operation from a
230 volt 50 or 60 cps AC line
is alsopossible
by adding a suitable capacitor (not supplied)
in
series with one side of the AC line. Informa-
tion on battery and 230 volt operation is in-
cluded in the Installation section of the Manual.
The Electronic Keyer will prove tobe a valuable
and most versatile addition to your other ama-
teur radio equipment. When youbecomefamiliar
with its use, you will undoubtedly improve the
clarity of your
CW transmissions and the con-
venience of operating.
complete informationonunpacking, tools, wiring,
soldering, and step-by-step assembly proce-
dures.

Page 3
LW**-@~
PARTS LIST
The numbers in parentheses correspond to the numbers in
the parts pictorial (fold-out from Page 5).
PART PARTS DESCRIPTION PART PARTS
No. PerKit
--
No. PerKit
--
RESISTORS (1/2 Watt) Nuts
(1)l-49 1 22 52 (red-red-black) (161252-51
1-42 3 270 52 (red-violet-brown) (17)252-1
1-46 6 3900
a (orange-white-red) (18)252-3
1-16 1 4700 52 (yellow-violet-red) (19)252-23
1-20 8 10 KO (brown-black-orange) (20)252-7
1-21 4 15 K52 (brown-green-orange) (21)252-32
1-22 7 22
K52 (red-red-orange)
1-23 2 27
K52 (red-violet-orange)
1-24 4 33
K52 (orange-orange-or- Washers
awe) (22)253-10
1-25 5 47 K52 (yellow-violet-orange) (23)253-19
1-60 5 68 K52 (blue-gray-orange) (24)254-7
1-31 1 330 KO (orange-orange-yel- (25)254-1
low) (26)254-5
CAPACITORS
(2)21-13 4 500 ppf disc
21-82 4 .02 pfd disc
21-48 4 .05 yfd disc
(3)25-131 3 250 pfd electrolytic
(4)27-20 1 .4 pfd resin
(5)27-2 2 1 pfd tubular
CONTROLS-SWITCHES
(6110-100 1 1000 D control
12-59
1 100 KO dual control
(7)60-10 1 DPTT slide switch
(8)64-23 2 SPDT snap switch
HARDWARE
Screws
(9)250-175 4 2-56 x 3/8"
(10)250-2 8 3-48 x 5/16"
(11)250-56 8 6-32 x 1/4"
(12)250-89 7 6-32 x 3/8"
(13)250-127 1 6-32 x 1/2" self-tapping
(14)250-26 10 6-32 x 5/8"
(15)250-126 1 10-32 x 1/2"
DESCRIPTION
6-32 thumb
Control
Push-on
Control flat
3/4" OD flat
#3 lock
#6 lock
Control lock
Other Hardware
(27)259-1 2 #6 solder lug
(28)255-60 4 5/16" OD spacer
(29)255-44 1 3/4" OD shoulder spacer
(30)259-11 2 #6 spade lug
WIRE-CABLE-SLEEVING
89-1 1 Line cord
343-6
1 Shielded cable
347-7
1 4-wire cable
347-1
1 8-wire cable
346-1
1 Sleeving
D 100 ES- TRA NSISTORS- LA MP-FUSE
(31156-26 5 IN191 crystal diode
(brown-white-brown)
(32)57-29 2 Silicon diode
417-43
1 2N398A transistor
417-28 7 2N407 transistor
417-67 3 2N2712 transistor
(33)412-13 1 Neon lamp
421-12
1 1/8 ampere fuse

Page 4
&%3+*3
PART PARTS DESCRIPTION
No. PerKit
--.
SOCKETS-JACK-PLUG-KNOBS
(34)434-70 8 3-pin transistor socket
434-101 3 4-pin transistor socket
(35)436-4 1 Phone jack
438-3
1 Phone plug
(36)462-105 1 Key knob
462-187
1 Knob for 1/4" shaft
462-209
1 Knob with hole
METAL PARTS
90-M291F 1 Cabinet bottom
100-M511
P73,74
1 Cabinet top
(37) 100-M512 3 Switch bracket
205-M455
1 Ballast plate
PART PARTS DESCRIPTION
No. PerKit
--
MISCELLANEOUS
51-118
1 Audio transformer
(38)54-156 1 Power transformer
(39)75-17 4 Plastic insulator
(40)73-1 1 3/8" rubber grommet
(41)205-456 1 Key lever
209-17
1 Speaker grille
261-20 4 Rubber feet
401-84
1 Speaker
431-66
1 8-screw terminal board
85-94P32OP321
1 Circuit board
(42)211
-M26 2 Plastic paddle handle
(43)258-M64 2 Leaf spring
(44)258-M65 1 Flat spring
490-5
1 Nut starter (See the Kit
Builders Guide)
331-6 Solder
595-703
1 Manual
STEP-BY-STEP ASSEMBLY
Before starting the assembly of this kit, read CIRCUIT
BOARD ASSEMBLY
the Kit Builders Guide for completeinformation
Soldering to the circuit board will be easier if
On wiring, and Ste~-B~-Ste~ solder and clip off the excess leads after
Assembly procedures. every
six or eight components are installed,
Perform the steps on Pictorials
1 through 3.

Page 5
START
for 15 to60 words-per-minute speed.
Use 68 KC? (blue-gray-orange) for
CONTINUE
A ~4 3900 $1 (orange-white-red).
1
PICTORIAL 1
FINISH
PROCEED TO PICTORIAL 2.

PARTS PICTORIAL

PICTORIAL 2
6-32 X 3/8" SCREW
PROCEED TO PICTORIAL 3.

Lra)-8
Page 7
START t
CONTINUE
1 NOTE: When install~nr plrrtrolvtir 1
NOTE: Solder the connections of capacitars, positlonthe lead from the
each large component as
it is in- positive
(+) end of the capacitor at
stalled.
PICTORIAL 3
>
! ueck to seethat all connectlons
are soldered, and cut
off ex-
cess leads
FINISH
Set the clrcu~tboard as~deand pro-
ceed to
Ule steps on Page 8.

PARTS MOUNTING-CABINET TOP
Refer to Pictorial 4 for the following steps.
Position a soft cloth on your working area. This
will help prevent scratchingthe cabinet top inthe
following steps.
/'
( ) Locate the cabinet top, and bend the two
spade bolts as shown in the inset drawing
on Pictorial 4. Start 6-32 nuts on the spade
bolts before bending them, to prevent dam-
age to the threads.
( 3. Install a 3/8" rubber grommet in hole B.
NOTE: Lockwashers and nuts will be used with
all screws when mounting parts, unless stated
otherwise in the assembly steps. Consequently,
the following steps will call out onlythesize and
type of the hardware to be used. For example,
the phrase "Use 6-32
x 1/4" hardware" means
to use 6-32
x 1/4" screws, #6 lockwashers, and
6-32 nuts. Refer to the Details for the proper
installation of hardware.
( ), Referring to Detail 4A, install the 8-screw
terminal board at
C. Use 6-32 x 5/8"hard-
ware, #6 solder lugs, and 6-32 thumbnuts.
The terminal board must be mounted onthe
outside of the cabinet top. Position the ter-
minal board and the
#6 solderlugsasshown.
r"'
( v[~eferring to Detail 4B, install the phone
jack at
A. Use a control lockwasher, con-
trol flat washer, and a control nut. Posi-
tion the phone jack and bend all three lugs
inward as shown.
I
P
(8) Referring to Detail 4C, install a 1000 1;1
control (#lo-100) at E. Use a control lock-
washer, a control flat washer, anda control
nut. Position the control as shown.
C'' ) In a like manner, install a 100 KfZ dual
control (#12-59) at
F. Position the control
as shown.
6-32 THUMBNUT
\
6-32 NUT =
#6 LOCKWA
Detail 4A
CONTROL NUT ....
OCKWASHER
FLAT WASHER
:..
'. INSIDE OF
CABINET TOP
Detail 48
,h?,cONTROL LOCKWASHER
g.::::..:, ::.-:... ,..
INSIDE OF
<~~~~<:/ C ABINET T 0 p
@
CONTROL NUT
Detail 4C .

Page B
A0 \
PICTORIAL 4
u P
TLY
Detail 40
NEON LAMP
A
INSIDE OF
E IIJ
h) Referring to Detail 4D, install the neon
lamp at
G, using the push-on nut. Position
tiie nut as shown.
(@elerring to Detail 4E, install the DPTT
slide switch at
H, using 6-32 x 1/4" hard-
ware.
(dkurnthe shafts of
both controls fully coun-
terclockwise.
4
(&Push the knob with the holethroughiton the
Speed control shaft. Theknobpointer should
be approximately at the
7 o'clock position.
(U/Place the
1/4" shaft knob on the Volume
control shaft. Position the pointer at the
7 olclock position and tighten the setscrew.
4%
9 & 6-32 NUT
116 LOCKWASHER
SLIDE SWITCH
I 6-32xl,4"
61
SCREW
Detail 4E

Page 10
W IRING-CABINET TOP
Refer to Pictorial 5 (fold-out from Page 11)
for the following steps.
(k,' Bend lug 5 of switch H against the switch
frame (S-1). See the inset drawing on Pic-
torial
5.
NOTE: After the neon lamp is wired in the
following steps, be sure the leads of the lamp
do not touch each other in the base of the lamp.
(
Place a 3/4" length of sleeving on one lead
'
of neon lamp G. Pass the end of this lead
through lug
1 of switch H (S-2). Do not cut
o,ff this lead.
i
I
(4 Place a 1/2" length of sleeving on this
same neon lamp lead. Then connect this
l~adto lug 3 of switch H (NS).
6'
(of Place a 3/4" length of sleeving on the
other lead of neon lamp
G. Connect this
lead to lug
4 of switch H (NS).
NOTE:
In the following two steps, do not wrap
the leads of the fuse around the switch lugs.
Position the fuse as shown in the inset drawing
on Pictorial 5. Be sure the body of the fuse
does not touch the cabinet top.
>,/'
(W. Locate the 1/8 ampere fuse. Cut one lead
to
7/8" and the other to 1/2". Place a 5/8"
length of sleeving on the longer lead and
yonnect it to lug 2 of switch H (S-1).
( '-/place a 1/4" length of sleeving on the
other lead of the fuse, and connect it to
lug 8 of switch
H (NS).
NOTE: When preparing the cables in thefollow-
ing steps, remove the outer insulation and cut
the wires at each end of the cable as specified.
Then strip 1/4" of insulation from each wire.
Twist the small wires together and melt a small
amount of solder on the exposed wire ends to
hold the small strands together.
(4'~eferrin~to Detail 5A, prepare a 9-1/2"
length of 8-wire cable as shown.
GRN 2-3/4"
YEL 2-1/2"
ORG 2-1/2"
GRN I-1/2" WHTZ-1/4"
RED 1-3/4"
WHT 1/2"
TAKING CARE NOT TO CUT THE INNER LEADS REMOVE THE INNER INSULATION. THEN APPLY
REMOVE THE OUTERINSULATION OF THE CABLE. SOLDER TO THE ENDS OF THE INNER LEADS.
9
h Detail 5A

NOTE: When installing prepared cables, apply
only enough heat to make a good solder con-
nection. Excessive heat will melt the insula-
tion on the wires.
( &"At the end of this prepared cable with the
short white wire, connect the white wire
to solder lug
K (S-1).
Connect the remaining wires from this end of
the prepared cable to terminal board C as fol-
lows. Be sure all the small wire strands of
each wire go into the terminal board lugs.
(J) Black to lug 8 (S-1).
( . ) Brown to lug 4 (S-1).
( ) Yellow to lug 7 (S-1).
(, ) Green to lug 3 (S-1).
( 4 Red to lug 2 (NS).
( 4 Blue to lug 5 (S-1).
( 4 Orange to lug 1 (S-1).
Position the circuit board along the side of the
cabinet top as shown. Connect the wires from
the other end of the prepared cable to the cir-
cuit board asfollows.
/
fi/$ Black to hole C (S-1).
( .-(Red to hole E (s-1).
(4 Green to hole D (S-1).
(A White to hole G (S-1).
(
Yellow to hole B (S-1).
('T Orange to one of the holes at H (S-1).
(/(~lue to hole K (S-1).
(-3/'~rown to one of the holes at R (S-1).
(+deferring to Detail 5B, prepare a 14"
length of 4-wire cable as shown.
( fAt the end of the prepared cable with the
short white wire, connecttheblackand white
wires to solder lug
J (S-2).
Connect the remaining wires at this end of the
cable to terminal board C asfollows.
( 7 Green to lug 6 (S-1).
( -) Red to lug 2 (S-2).
The other end of thecablewillbe connected later.
-2- 1 /4"
RED WHT 2-1/4"
2- 114'
BLK 2-1/4"
GRN 1 -3/4"
RED I-1/4"
4- WIRE CABLE GRN 1-1/4"
Detail SB

PICTORIAL 5

PICTORIAL 6

#6 LOCKWASH
INSIDE
OF
Detail 5C .
(v'.'heferring to Detail 5C, install the speaker Connect the wires from the end of thisprepared
and speaker grille. Use 6-32 x 5/8" hard- cable. with the short red wire as follows.
ware and plastic insulators. Position the
. .
speaker as shown. Turnthe insulators sothe
( 5 Brown to lug 1 of control E (S-1).
tips fit against the edge and not on top of
the speaker frame. Refer to the insetdraw-
({I White to lug 3 of control F (S-1).
ing in Detail 5C. (n/&ue to lug 6 of control
F (S-1).
(-") Strip a total of 3/4" of insulation from the
Refer to ,Pictorial
6 for the following steps. end of the green wireandpassitthrough lug
2 (S-2) to lug 5 (S-1) of control
F.
j ) &rring to Detail 6A, prepare an 8-1/2"
Aiength of 8-wire cable as shown.
@ ) Yellow to lug 3 of control E (S-1).
I
8-1/2" -3-1/2" RED 3-1/2"
BRN 3-1 /4"
YEL 3-1/4"
ORG 2-1/4" BLK 2-3/4"
WHT 2-1 /4"
BLU 2-1/4" GRN 2-1/2"
ERN 2-1/4"
YEL 1-1/2" BLU 2-1/4"
ELK 1-1/2" ORG 2-1/4"
8-WIRE CABLE
RED 1-1/4" WHT 1-3/4"
Detail 6A

Page 13
In the following three steps, pass the remaining
cable wires under the existing wires going to
switch H.
Orange to lug
6 of switch H (S-1).
@ ) Black to lug 3 of switch H (S-2).
d~edto lug 4 of switch H (S-2).
Connect the wires from the other end
of this
cable to the circuit board asfollows.
f "f~lackto hole M (S-1).
6- j Red tohole N (S-1).
( filue to hole U (S-1).
( fireen to hole S (S-1).
( +-White to hole T (S-1).
--.-CC-
( ) Orange tohole H (S-1).
( (~rownto hole R (S-1).
i
(9 Yellow to hole P (S-1).
e-) Pull the wires out of the outer insulation
of the remaining length of 4-wire cable.
These wires
will be used as hookup wire
in the remaining steps.
(.A Connect a 4" green wire fromlug3of phone
jack
A (S-1) to lug 1 of speaker D (S-I).
Position the wire asshown.
(\)-*Connect a 1-3/4" red wire from lug 2 of
speaker
D (S-1) to lug 2 of control E (S-1).
(/^) Connect a 3/4" bare wire (cut-off resistor
lead) between lugs
1 (S-1) and 2 (S-1) of
phone jack
A.
(L) Referring to Detail 6B, pass the stripped
end of the line cord through grommet
B.
Tie a knot 8" from the end of the line
cord and separate the two wires to the
knot.
('-1" Cut one line cord wire to 3" from the hot,
and strip 1/4"
of insulation from the end.
Twist the small wire strands together and
melt a small amount
of solder on the ex-
posed wire ends.
LINE CORD
&
II
Detail 6B
(- ) Referring to Detail 6C, pass the free end
of the shorter line cord wire between the
frame and leads of the power transformer
on the circuit board. Connect the wire to
hole
L (S-1).
6.) Pass the free end of the longer line cord
wire through the hole in the circuit board
and connect it to lug
8 of switch H (S-2).
Position the wire as shown.
Lugs
1 and 4 of control F, andlug 7 of switch H,
are not used.
This completes the wiring on the cabinet top
and the circuit board. Check to see that all
connections are soldered.
Inspect the circuit board to be surenone
of the
wires that are connected to the foil side pro-
trude through the board and touchthecomponent
leads. Cut
off any wires that are touching com-
ponent leads. Also, be surethere are no solder
bridges between foils.
/ POWER
TRANSFORMER
62-51-
Detail 6C

PICTORIAL 7
TRANSISTOR INSTALLATlON
Refer to Pictorial 7 for the following steps.
Carefully turn the circuit board over and posi-
tion
it as shown.
I
('d Referring to Detail 7A, install 2N407 tran-
sistors in sockets
Q1, Q2, Q4, 95, Q7, Q9,
and QiO. Support the circuit board fromthe
foil side as you install the transistors.
This will prevent damage to the board.
Detail 7A

FLAT SIDE
\
L Detail 7Ei
/e-*d
( ) Referring to Detail 7B, cut the leads of the
three 2N2712 transistors to 3/16", Install
these transistors in sockets
Q3, Q6, and
Q11. Note flat side of transistor.
4d'
( ) Referring to Detail 7C, bend and position
the center lead of the 2N398A transistor
as shown.
Cut all three leads to 3/16".
Install the transistor in socket
Q8.
Check to see that none of the transistor socket
solder connections were pulled loose from the
circuit boardwhen the transistorswereinstalled.
Temporarily, setthe cabinettop andcircuitboard
assembly aside.
KEY-MECHANICAL ASSEMBLY
Refer to Pictorial
8 on Page l6forthe following
steps.
Locate the ballast plate and position it on the
work area as shown.
64)' Referring to Detail 8A, install the 3/4" OD
shoulder spacer at
M. Use a 10-32 x 1/2"
screw and three 3/4" OD flat washers. Do
not tighten the screw at this time.
(&dstall switch brackets at N and P, using
6-32
x 1/4" screws. Position the brackets
as shown. Push them asfar aspossible to-
ward the outside of theballastplate. Tighten
the screws just enough to hold the brackets
in place. They will be readjusted later.
ERE
BEND CENTER LEAD
OVER LOCATING TAB.
LOCATING TAB
BEND CENTER LEAD
UP
KEEPING IT IN LINE WITH.
BUT NOT TOUCHING THE
OTHER TWO LEADS.
3/4" OD SHOULDER
SPACER
3/4" OD FLAT
6-32x 1/4"
SCREW
h
@ 10-32xV2" SCREW
PUSH OUTWARD AS FAR AS POSSIBLE
IN DIRECTION OF ARROW.
Detail 8A