IN LOCOMOTIVE STEAM CHUFF SOUND
for various track power by
CAUTION-THIS DEVICE CAN BE DAMAGED BY STATIC DISCHARGE. PLEASE EXERCISE
CARE DURING INSTALLATION TO AVOID THIS POSSIBILITY. DISCHARGE YOURSELF TO
AN ELECTRICAL GROUND (OUTLET COVER SCREW) BEFORE REMOVING THIS DEVICE
FROM ITS ANTI-STATIC BAG. PLEASE READ INSTRUCTION SHEET COMPLETELY BEFORE
ATTEMPTING TO INSTALL AND OPERATE THIS PRODUCT.
Save the anti-static bag for possible reuse of storing or shipping the sound unit!
OVERVIEW:
This device is an electronic, self contained, sound system for installation in model steam
locomotives that are designed to operate with conventional track power, digital (DCC), or other
types of command control systems including radio with either track or battery power. Because of
its dimensions (2.5" x 0.9" x approx. 0.5" high) the sound system may be limited to larger gauge
models and may also require the use of a trailing car.
An on/off switch (not included) must be used to turn the sound unit on and off in some
applications. If there is sufficient input power, the audio amplifier can produce one watt of audio
power which is in excess of what most small speakers can handle. The speaker impedance must
be 8 ohms or higher. Sound volume is adjustable. This unit is designed with the intent of creating
exhaust chuff's required for compound engines or continuous exhaust chuff with other
monophonic sound systems. Since it's intent is for the locomotive to go beyond simple exhaust
chuff operation, it will only work with a synchronized input. Our optical synchronizer, #585, is ideal
for synchronized operation and is included with this unit. Since this unit is mainly used in
conjunction with other systems, a speaker is not included. Sounds produced include user
controlled cylinder blow down, ball cocks open / closed when first pulling out, and steam exhaust
chuff sound automatically adjusted to speed and load conditions.
This sound system, when used with conventional DC track power, requires the use of our
LocoMatic™ Controller (Item 755) to operate the cylinder blow down , ball cock's open (normally
closed), and main sounds on/off. In addition to the controller, an appropriate choke is required
(see item 702 or 703). If installing dual systems, only one choke is needed. The LocoMatic™
Controller and choke's are not included since they are for specific installations. DCC and other
command control operators can use remote functions on their systems to activate these
functions.
INSTALLATION INSTRUCTIONS:
The sound system consists of a printed circuit board, five 2-pin connectors and two 3-pin
connectors with wires.
Refer to the drawing on page 2 to familiarize yourself with the connectors and controls on the
sound board. Then refer to the specific instruction sheets for the type of installation you intend to
make. Before proceeding with the installation read the balance of the instructions carefully so you
will be completely familiar with what is required and what sounds you should hear.
The circuit board should be mounted, usually in the locomotive tender, so that the volume and
other controls are accessible either through the frame or via a hatch or a hole in the tender body
shell. Be certain that the components on the circuit board do not come in contact with any metal
objects as such contact can destroy the sound system. A speaker should be mounted as per
available space bearing in mind that sound reproduction is enhanced when a speaker is properly
enclosed and baffled.
If a DC locomotive is not moving, there is no track power, therefore to have sound it is necessary
to have a separate power supply for the sound system. For in locomotive use, this separate
supply is a battery. We suggest the use of one 9 volt, 6 AA, or 6 AAA batteries in series (7.2 - 25
Version 3.8
volts) to maximize volume potential and battery life. Rechargeable batteries can be use d. When
connecting the battery (DC) power leads be absolutely certain that wires connect to the proper
DC input leads.
If any connections are not done properly, especially the power connections, you will damage the
sound system. This type of damage is not covered under any warranty. The sound system is
thoroughly tested and inspected before packing to insure proper function. There is a minimum
charge of $35.00 plus s/h for repair.
SOUND INFORMATION:
CYLINDER BLOW DOWN is required to remove condensate that accumulates in the cylinders
when a locomotive has been at rest. This condensate must be exhausted from the cylinders prior
to the pistons being powered by steam or there can be damage to the cylinders. CYLINDER
BLOW DOWN sounds will be generated by the sound system when requested. With the
LocoMatic™ Controller you depress and release the ALT & F3 button to turn on the CYLINDER
BLOW DOWN and then again depress and release the button to turn the CYLINDER BLOW
DOWN off. Toggle switch or remote function control does not require the PUSH ON - PUSH OFF
sequence. In either case of operation, the CYLINDER BLOW DOWN will automatically turn off
when the locomotive starts running (1.5 - 2 volts is required on the motor input terminals, J3 pins
2 and 3, to be sensed). If the input, J5 pin1, is constantly pulled low to J2 pin2 or via a function
control with a remote receiver, the sound system will turn off the CYLINDER BLOW DOWN when
needed and automatically turn it back on after the locomotive has stopped for a short time.
BALL COCKS are controlled with the CLYLINDER BLOW DOWN. When they are open
condensate is pushed out of the cylinder heads by steam pressur e. When they are left open, a
different exhaust chuff is heard. This is that of semi-compressed steam. Steam locomotives must
evacuate all condensate before allowing the cylinder head to completely close and fully compress
steam or the cylinder heads will explode. By leaving the CYLINDER BLOW DOWN set ON when
the locomotive starts pulling out you will hear the air blowing out of the Ball Cocks in synch with
each exhaust chuff. After a few revolutions the ball cocks will automatically close or you can
manually close them with the ALT & SF3 or function as connected.
EXHAUST CHUFF is the most notable sound of a steam locomotive in motion. The sound is the
result of the used steam from the cylinders being vented through the stack. Each cylinder will
exhaust twice during each drive wheel revolution and since most steam locomotives have tw o
cylinders, the exhaust should chuff four times for each drive wheel revolution. EXHAUST CHUFF
sounds should vary from a very slow chuff rate to an almost continuous roar at high speed.
EXHAUST CHUFF should also vary as to the load on the locomotive with a heavy train making a
louder exhaust. This sound system will vary the EXHAUST CHUFF sound with actual movement
of the drive wheels or other axles via the optical pickup. Additionally, the EXHAUST CHUFF
volume will increase above normal during accelleration and will be lower when decellerat ing. The
pitch of the EXHAUST CHUFF can be hard wired as explained on page 2 for various pitches
desired. The selection is from thunderous large cylinder locomotives to that of small cylinders
found on switcher type locomotives.
SPEAKER MOUNTING: The speaker generally should be mounted so that the sound can
actually "get out" of the locomotive. A hole in the floor of the tender is acceptable but the front of
the coal bunker or even through a simulated coal load may be a better choice as the so und can
exit forward or upward rather than down toward the track. In some cases, particularly in the larger
gauges, mounting a speaker inside the front of the boiler with a open stack can enhance the
sound. Enclosing the speaker in a chamber will also enhance sound reproduction. A very simple
enclosure can be made with a tube. It is usually best to seal the end of the tube, so there are no
air passages to the rear of the speaker, thus creating a sound chamber. By carefully sealing all
1
openings it may be possible to use the entire tender body shell as a sound chamber. A simple
wall behind the speaker may be all that is possible or perhaps all that is needed.
Speakers can be attached with double sided tape, with g lue, or with "hot melt". Enclosures can
be made with plastic, wood, card stock, or even metal. Film cans or medicine bottles make
excellent sound chamber enclosures for small diameter speakers. Attachment with "hot melt" is
advantageous as the "hot melt" can be used as a gap filler when creating an enclosure.
A second speaker, wired in series with the main speake r, can also enhance sound quality and will
permit a higher volume without damage to the individual speakers.
Speaker enclosure is an art and experimentation is definitely in order for your installation so as to
gain the maximum benefit of the superb sound quality available in this sound system. Sometimes
a cluster of four smaller speakers will fit better and produce very acceptable sound versus a
larger speaker that may not fit very well.
GENERAL OPERATING INFORMATION:
VOLUME ADJUSTMENT: should be set as desired for your application. Please remember that
the amplifier can produce more power than a small speaker can handle and that the sound will be
louder if the speaker is properly enclosed and baffled. If you are using batteries, the louder the
volume the shorter the battery life.
SPEED SET control adjusts the sensitivity for run/stop operation of the sound system. Rotate the
control CCW to increase the voltage sensitivity. Use the unit in this mode, full CCW, for all 12 volt
DC systems. For higher voltage systems, turn the control more CW. For 20 volt and higher DC
and ALL AC systems, turn the control full CW.
SOUND FEATURES: Another feature incorporated in this sound system is the ability to turn all
sounds off, leaving only the Whistle and Bell to operate on the main unit and no exhaust ch uff
from this unit. This can be done with the LocoMatic™ Controller by using the ALT & SF4 button
and is a push on / push off function. Other operators can access this with using function / switch
inputs.
DUAL SYSTEMS: This system can be used with another DC, LocoMatic™, or other AC type
sound systems. Wiring for each type of system must be followed to avoid any premature damage.
If one speaker is desired, an auxillary amplifier must be used such as item #671 or #672. Wiring
for use with one of these amplifiers is contained with the amplifier instructions.
Volume Control
Speed Set
Speaker Output
Option Select: (J5)
1 - force blow out (red )
2 - main sounds OFF (gray)
NOTE: The speaker impedance should be kept near or above 8
ohms, therefore four 8 ohm speakers in a series/parallel
configuration is acceptable since it yields 8 ohms total
impedance. If you care to use two 8 ohm speakers you must
place them in SERIES.
Chuff Pitch: (J4)
connect from: 1 (red) 2 (gray) to: J2 - 2 (gray)
lowest pitch no no
higher pitch yes no
higher pitch no yes
highest pitch yes yes
This system features an optically coupled motor input sensor. This means that any
connection to J3 pins 1, 2, and 3, do not electrically connect to any other power
to the board!
J3 connections:
1 - track RF input (RED)
2 - Motor 1 (BLACK)
3 - Motor 2 (WHITE)
J1 connections:
1 - DCC rail 1 ......... also AC input 1 ......... (RED)
2 - DCC rail 2 ......... also AC input 2 ......... (GRAY)
Synchronized input
See pg10 for use
with Steam Sound
systems.
When connecting DC power to the sound unit be absoloutly
sure that the "+" and "–" are connect correctly! If not, you
will either burn out the sound unit or the supply feeding it.
This is not covered under warranty!
J2 connections:
1 - DC power "+" (RED)
2 - DC power "–" (GRAY)
SPECIFIC INSTRUCTION SHEETS
PAGE
3, 4 Conventional DC
5 DCC & Other receiver
6 dual systems & aux.
7 dual systems & aux.
8 dual systems, one #711 and
9 Synchronized Exhaust
10 Synchronized Exhaust
INSTALLATION TYPE
Amplifier
Amplifier with
LocoMatic™ controller
one LocoMatic™ sound
& control system with
LocoMatic™ controller
connections and
installation picture
sensor patterns
246 W. Main St.
Leola, PA 17540
(717) 661-7041
www.dallee.com
2
DC track power installation using standard batteries & DALLEE controller #755
speaker
Chuff Pitch: (J4)
connect from: 1 (red) 2 (gray) to: J2 - 2 (gray)
lowest pitch no no
higher pitch yes no
higher pitch no yes
highest pitch yes yes
to optional chuff
sound settings
Battery Holders
#579 - single 9 volt (shown)
#652 - holds 6 AA
#654 - holds 2 AA
#578 - 9 volt battery snap
connector
Battery power - must not exceed 24 volts DC.
Use one 9 volt battery or a string of 6 AA or
AAA batteries (24 volt DC maximum input). Life
depends on volume setting and speaker
impedance. Typical operation of most sound
systems for one good 9 volt batteries is about 8
hours, AA or larger is well beyond 50 hours!
#524 DPST switch.
Switch shown in the OFF position.
Drawn as a SPST.
– +
9V or 6-AA,
or 6-AAA
batteries
+
–
Red
Red
Gray
ON / OFF
switch
wires with a " " ARE a
connection!
wires crossing over
(without a " ")
DO NOT CONNECT!
Right Rail
pickup
either rail may be used. Right / Left
only used for reference.
DC
motor
lighting
CHOKE *
circuits
Left Rail
pickup
*Larger motors require a larger capacity choke.
Choke's available:
Item 702 - 1.5 ampere loads
Item 703 - 5.0 ampere loads
Lighted car / other engines used in consist preperation. You will know if this is necessary
by placing the locomotive / lighted cars on the track and then attempting to blow the
Whistle or operate the BELL. If they do not operate with the other items on the track
then you need to do the following. We suggest doing this to all lighted cars or
engines used in the same consist since it lets the signal stay at it's maximum level.
CHOKE PACK
for additional chokes order:
Item 702 for up to 1.5 ampere load
Item 703 for up to 5.0 ampere load
Right Rail
pickup
CHOKE
either rail may be
used. Right / Left
only used for
reference.
looks like coil of wire with a
lead on each end
Formerly right
rail pickup
Lighting load, other locomotive in
consist, or other type circuitry
drawing off of track power. As
shown one lead needs to be
disconnected from the rail and a
"CHOKE" needs to be placed in
series with the load. In most cases
the 1.5 ampere (#702) will handle
the load.
LOAD
Left Rail
Pickup
3
speaker
DC track power installation #2 with DALLEE controller #755.
With rechargeable or standard battery.
When track voltage exceeds battery voltage, the sound system will
operate from track voltage instead of battery voltage.
Red
wires with a " " ARE a
connection!
wires crossing over
(without a " ")
DO NOT CONNECT!
Red
+
Gray
–
Chuff Pitch: (J4)
connect from: 1 (red) 2 (gray) to: J2 - 2 (gray)
lowest pitch no no
higher pitch yes no
higher pitch no yes
highest pitch yes yes
Battery Holders
#579 - single 9 volt (shown)
#652 - holds 6 AA
#654 - holds 2 AA
#578 - 9 volt battery snap
connector
Battery power - must not exceed 24 volts DC.
Use one 9 volt battery or a string of 6 AA or
AAA batteries (24 volt DC maximum input). Life
depends on volume setting and speaker
impedance. Typical operation of most sound
systems for one good 9 volt batteries is about 8
hours, AA or larger is well beyond 50 hours!
to optional chuff
sound settings
#524 DPST switch.
Switch shown in the OFF position.
Drawn as a SPST.
This diagram allows for the use of rechargeable batteries. When
track voltage exceeds battery voltage, the sound system will operate
from track voltage and the battery will start to charge (when in the
forward direction). If you need to charge the battery fully without the
sound system on, place the locomotive on the track (with the motor
not powered if present) and leave full track voltage on for 14 hours.
The batteries will charge whenever the locomotive track power is
set for the forward condition regardless of the sound system being
on or off. They will not charge when the polarity on the track is set
in reverse. When running in reverse, the sound system will only
operate from the battery. A bridge rectifier could be used instead of
a single diode alleviating this potential problem.
ON / OFF
switch
– +
9V or 6-AA,
or 6-AAA
batteries
Right Rail
pickup
either rail may be used. Right / Left
only used for reference.
DC
motor
lighting
CHOKE *
circuits
Left Rail
pickup
*Larger motors require a larger capacity choke.
Choke's available:
Item 702 - 1.5 ampere loads
Item 703 - 5.0 ampere loads
1N4002 or
equivalent diode
(item #374)
If using a standard battery instead of
rechargeable, do not connect/use a resistor!
Resistor needs to be calculated for battery type (you must know
the charge currents of the batteries used) and maximum track
voltage used.
R = (Vtrk max - Vbatt nominal) / battery charge current
For 12 - 14 volt maximum track voltage:
1 - Item #647 (8.4v / 150mahr) rechargeable battery use 380 ohms
(1/4 watt).
6 - Item #648 (1.2v / 700mahr) rechargeable batteries in series, use
100 ohms (1/2 watt).
For 18 volt maximum track voltage:
1 - Item #647 (8.4v / 150mahr) rechargeable battery use 560 ohms
(1/4 watt).
6 - Item #648 (1.2v / 700mahr) rechargeable batteries in series, use
180 ohms (1 watt).
4
DCC receiver installation using synchronization for chuff and
speaker
Gray
S4
Function key:
Red
S3
function control for Cylinder Blow Down, Main Sounds ON / OFF
receiver motor leads (Orange / Gray is
standard practice). If you are using a
seperate receiver merely connect the
motor leads to pins 2 (red) and 3 (gray)
of J3. The sound system presents a load
of 480 to 980 ohms (depends on speed
set control setting).
Make sure that your receiver is operating in
the same step mode as the transmitter !!
Chuff Pitch: (J4)
connect from: 1 (red) 2 (gray) to: J2 - 2 (gray)
lowest pitch no no
higher pitch yes no
higher pitch no yes
highest pitch yes yes
S3 - Cylinder Blow Down
S4 - Main sounds off
Red
Gray
Red
+
Vraw - do not
See note1.
Connect S3, S4 to function control desired.
You do not need to connect functions you
do not intend on using.
DCC
track power input
Note1: if you do not desire to use the input rectification provided on the sound board
and have a Vraw available from your decoder you may elect to not use the DCC track
connect!
power input to power the sound system. You then need to connect Vraw to the Vraw
of the decode. The decoder rectification circuit must be able to carry enough power for
the sound system and motor. Therefore, this is not recomennded!
Connect motor
M
Connect wires from J4 to J2
for Chuff Pitch desired. If
you want to change pitches
with functions, connect
inputs ofJ4 to functions thus
allowing for remote
selection.
if present
Other receiver or controller installation using synchronization for chuff and
speaker
Gray
S4
S3
function control for Cylinder Blow Down, Main Sounds ON / OFF
receiver motor leads. Connect
the motor leads to pins 2
Connect motor
M
Red
+
Gray
–
Red
S3 - Cylinder Blow Down
S4 - Main sounds off
Function key:
Connect S3, S4 to function control desired. You
do not need to connect functions you do not
intend on using.
DC battery power input.
Input voltage of 7 to 24 volts DC. Absoulute maximum
input is 35 volts DC! If the battery supply is not the
same as the receiver supply, connect the gray "-"
wire to the "-" of the receiver supply.
5
if present
If you are using a receiver that
operates higher than 24 volts, it is
necessary to add a 470 ohm, 1/2
watt, resistor in series with one of
the inputs to J3 from the motor lead.
(black) and 3 (white) of J3.
The sound system presents
a load of 480 to 980 ohms
(depends on speed set
control setting).
speaker output
Gray
Using dual sound systems with an auxillary amplifier.
1k, 1/4w
(brn,blk,red)
Black
Switch key:
White
S1 - Whistle (momentary)
S2 - Bell
S3 - Cylinder blow down
S4 - Main sounds off
White
Connect only the
switches or
functions desired.
Black
connect White and Black wire together on
SYNC input as shown. This will prevent
the chuff from playing in this unit.
All main sounds
except exhaust
chuff would be
produced by this
sound unit.
+
–
Red
Gray
speaker output
Gray
Black
White
Chuff sounds
produced by this
sound unit.
Red
+
Gray
–
This unit, #711, will produce the exhaust chuff sounds. Input J4 would be
hard wired to J2 gray as page 2 explains. Inputs for J5 would be
connected to functions if desired in parallel with J5 of main unit above.
If no auxiliary amplifier is present, merely connect everything else as shown
except it will be necessary to utilize two speakers. One speaker for the
main sound board, the other for the chuff board.
ON / OFF
switch
#524 DPST switch.
Switch shown in the OFF position.
Drawn as a SPST.
1k, 1/4w
(brn,blk,red)
Black
Audio input. Connect as shown to
resistors and gray speaker wire from
sound system. Do not use the red
speaker wire from the sound system.
This wire does not get connected!
6
Connect motor
M
Dual Systems without an amplifier are connected in similar fashion
except for the amplifier and joining of speaker wires through 1k
resistors. Instead each sound system must have it's own speaker.
if present
Red
Gray
Auxillary 11 or 22 watt Audio Amplifier
with Treble and Bass controls.
Item 671 - 11watt, 672 - 22 watt.
Red
Black
Gray
More than one power amplifier can be used. To do so
connect the input wires (gray) in parrallel from the
amplifier to the sound systems gray speaker wire or
use one amplifier for each sound system.
DC battery power input.
Input voltage of 12 to 24 volts DC.
+
Connect to the same power that is
powering the sound system.
If this is a DCC system, one of the sound
–
units needs to have J1 connected to the
track power and no battery power or an
on/off switch would be connected. Switch
inputs s1 - s4 would be functions.
1
2
3
track power,
receiver
motor leads.
use
8 ohm
speaker
Using dual sound systems with DC track power, LocoMatic™ controller, and an optional auxillary amplifier.
speaker output
Gray
All main sounds except
exhaust chuff would be
produced by this sound unit.
White
connect White and Black wire together on
SYNC input as shown. This will prevent
the chuff from playing in this unit.
Black
speaker output
Gray
Red
Red
Black
White
+
–
Red
Gray
1k, 1/4w
Connect motor
M
#524 DPST switch.
Switch shown in the OFF position.
Drawn as a SPST.
if present
ON / OFF
switch
1k, 1/4w
(brn,blk,red)
lighting
circuits
Red
Gray
either rail may be used. Right / Left
only used for reference.
DC battery power input.
Input voltage of 12 to 24 volts DC.
Connect to the same power that is
powering the sound system. For best
amplifier operation, use 12 to 18 "AA"
+
batteries or larger type.
If track power and battery operation is
–
desired, as shown on page 4, connect
power to batteries / track as shown on
page 4. All battery power must go to the
sound systems and amplifier.
Right Rail
pickup
Left Rail
pickup
use
8 ohm
speaker
Auxillary 11 or 22 watt Audio Amplifier
Item 671 - 11watt, 672 - 22 watt.
with Treble and Bass controls.
Chuff sounds
produced by this
sound unit.
This unit, #711, will produce the exhaust chuff sounds. Input J4 would
be hard wired to J2 gray as page 2 explains. Inputs for J5 would not be
connected. If using the LocoMatic™ Controller you would connect pin 1
of J3 on this unit to the upper unit as shown on page 3 and 4. You will
also have to connect the choke as shown on those pages.
Dual Systems without an amplifier are connected in similar fashion except for the
amplifier and joining of speaker wires through 1k resistors. Instead each sound
system must have it's own speaker.
+
–
Red
Gray
Black
Audio input. Connect as shown to
resistors and gray speaker wire from
sound system. Do not use the red
speaker wire from the sound system.
This wire does not get connected!
7
Red
Black
Gray
More than one power amplifier can be used. To do so
connect the input wires (gray) in parrallel from the
amplifier to the sound systems gray speaker wire or
use one amplifier for each sound system.
1
2
3
Using LocoMatic™ sound systems with Chuff board 711 and LocoMatic™ controller.
Type 4 System Type 3 System
Chuff sounds
produced by this
sound unit.
to optional chuff
sound settings
Orange
Yellow
Black
All main sounds
except exhaust
chuff would be
produced by this
sound unit.
lower board of type 4 system
White
Blue
Brown
Red
Red
Gray
Black
Red
Connect as per
Gray
Red
LocoMatic™ instructions
for type motor in engine.
connect DC power input, J2, to
main power board as shown.
Carefully solder leads to
capacitor C4 or C5 using
appropriate solder*. Make sure
the polarity is kept correct. The
RED wire goes to the "+" lead
and the GRAY wire goes to the
"-" lead. Reversing these leads
will severely damage the units.
Observe polarity!
connect White and Black wire
together on SYNC input as
shown. This will prevent the
chuff from playing in this unit.
field wires
track power
input
motor
brushes
Chuff sounds
produced by this
sound unit.
to optional chuff
sound settings
Connect DC power
input, J2, to either C21
(as shown), C22, or
C34 capacitor leads.
Carefully solder leads
to capacitor using
appropriate solder*.
Make sure the polarity
is kept correct. The
RED wire goes to the
"+" lead and the GRAY
wire goes to the "-"
lead. Reversing these
leads will severley
damage the units.
connect White and
Black wire together
on SYNC input as
shown. This will
prevent the chuff from
playing in this unit.
8
White
Black
Red
Gray
Red
Connect as per
LocoMatic™ instructions
for type motor in engine.
Orange
Yellow
Black
Blue
Red
Brown
field wires
track power
input
motor
brushes
for EITHER SYSTEM:
Connect either a speaker to each
board or connect to auxiliary
amplifier with one common
Red
Gray
speaker as shown in the
amplifier instructions.
Connect 711's pitch control (J4)
as per page 2 instructions.
* appropriate solder is solder with
a core intended for electronics.
DO NOT use any paste type
solder's. These will severely
damage the electronic
components and the printed
circuit boards as well.
Soldering to electronic is an art
that requires certain skills.
Damage created by
inappropriate soldering skills is
not covered under any
warranty expressed or implied.
Synchronization of Exhaust Chuff
Switch Synchronization:
1 - connect Common (C) of the switch to the White wire from the SYNC input.
2 - connect Normally Open (NO) of the switch to the Black wire from the SYNC input.
Switch closure should occur on peaks of quartering lobes.
can switch much faster, don't bounce, and do not interfere with the mechanical operation of the axle.
We recommend using optics since they
For optical coupler (item #585) synchronization:
1 ...... connect Black and Green optical pickup wires together, this then connects to the Black wire
from the SYNC input.
2 ...... connect Red optical pickup wire to the Red wire from the SYNC input.
3 ...... connect White optical pickup wire to the White wire from the SYNC input.
see page 11 for picture of installation.
Item #707, as shown, is a subminiature micro switch for this purpose, in lieu of using
optics (0.32"L X 0.1" W X 0.26" H).
DO NOT use a leaf switch to the chassis (quartering lobe) this will damage the sound unit!
Focus Distance
1/8" - 3/16"
Optical pattern
mounted on
drive axle
WHITE
GREEN
BLACK
RED
For extra 2 and 3 pin ultra-miniature connectors, see item's 757 and 758.
They are listed under Accessory Items / Connectors.
It is not necessary to use the black / white stripe pattern, anything that will
come in and out of focus to the optical reader will also work! So, engines with
cams installed or a piece of plastruct rectangular tubing cut and glued to the
axle may also work with proper alignment.
Remember, some paints and other type markers will still reflect the infr-red
light. So, just because it's black doesn't guarantee that it will work. The
optical coupler comes with laser printed stripes, included on page 10.
Optical Coupler (hi-lighted for ease of
viewing) mounted to frame 3/16" from
optical end to pattern. In this installation,
the end mounting ears had to be trimmed
to obtain clearance to the drive gear box.
When doing so care must be used to not
damage the optics.
apply a thin layer of
glue on each side to
prevent oil from
contaminating the
optical pattern.
9
Synchronized Chuff Patterns for RIM READING for 4 chuffs per revolution.
Cut pattern that suits wheel diameter and cut large enough to cover inside flange.
Mount pattern on inside flange (clearing center axle from pattern). Trim
excess beyond flange. Align optics to read pattern. Any external light shining
on the optical sense end will cause improper readings.
RIM READING for 2 chuffs per revolution
Synchronized Chuff Patterns for AXLE READ, 4 chuffs per revolution.
mount optics inside chassis and read driver axle. This is the ultimate location,
when the drivers slip on the rails the sound follows! Common axle diameters
shown below. Select appropriate one (or make your own) and cut out, the
long black strip shows total circumference of the axle leaving 4 white stripes.
The chuff starts on the black stripe and ends at the end of the white stripe.
For correct synchronization, place the center of the black stripe facing the
optics when a piston (main rod) is at the center of it's travel.
If you prefer to paint the stripes, be sure that the black paint is a flat finish. A
gloss or semi-gloss will reflect as white / bare metal.
You can also read the high lobes of an existing cam.
The optic can also be mounted
perpindicular to the axle for
proper reading. Remember, it
must be mounted at least 1/8"
away from the reading area for
proper pickup.
Synchronized Chuff Patterns for Reading an Axle
RIM READ
- shown mounted inside
truck.
Remember to shield the optic from stray light entering the pickup end. If light
does stike the sensor it can overcome the infra-red reflection creating the
loss of exhaust chuff synchronization.
10
20.6
6.5mm
7mm
22.14
22.44
9/32"
23.6
7.5mm
5/16"
25.0
8mm
25.1
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