EMD Class-66 Sound Auto
EMD Class66 with auto "DE" & "DAR"
switches, be careful not to crack the glass. Do not bend the leads at the glass ends, use a needle
nose pliers to hold the wire entering the glass and then bend the wire. Bending at the glass will
break or deform the alignment of the reed switch. Carefully solder wires and cut excess lead ends.
Reed switches are not warranted under any circumstance since they are quite fragile and easily
broken physically and electrically. Extra reed switches are available, item 989. After appropriate
lengths of wire are placed on the reed switch, secure the reed switch with either double sided tape
(item 388) or other type of glue. Make sure that all wires to the reed switches and sound system do
not come into contact with any other metal or power wire since this may damage the sound system.
DCv3 class66rs rev3
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
diesel locomotives that are designed to operate with conventional DC track power or other types of
control systems including radio with either track or battery power, also as a stationary sound unit.
Because of its dimensions (2.7" x 0.9" x approx. 0.5" high) the sound system may be limited to
installations in some powered units making the need for use of a "dummy" unit or a trailing car. This
unit differs from other units in that it contains two different horn play patterns as well as diesel
startup and shutdown sounds. Therefore, it is suggested to operate this sound unit from only fixed
power requiring a battery or constant track power instead of straight DC track power. Triggering the
Horn play patterns is done by the use of either momentary switch inputs or via a reed switch
passing a fixed magnet (not included). For reed switch operators, magnet trips are placed in the
track. Another method of operation is to operate the sound system as a stationary unit and place the
magnets on the underside of an engine or car.
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 $40.00 plus s/h for repair.
SPEAKER MOUNTING: The speaker generally should be mounted so that the sound can actually
"get out" of the locomotive. A hole in the floor or fuel tank is acceptable but open grills or a doorway
may be a better choice as the sound can exit upward rather than down toward the track. In some
cases, particularly with plastic body shells, just mounting the speaker against the shell will be
adequate as the vibrations of the shell 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. The longer
the tube the better the speaker will reproduce low frequency sound which is inherent in diesel prime
movers. 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 openings it may be possible to use
the entire body shell as a sound chamber. A simple wall behind the speaker may be all that is
possible or perhaps all that is needed.
An on/off switch (not included) must be used to power the sound unit on and off in some
applications. The audio amplifier can produce 1.1 watt of power which is in excess of what most
small speakers can handle. If more audio power is desired, an amplifier such as item #671 or #672
can be used. The speaker impedance must be 8 ohms or higher. Sound volume is adjustable. Refer
to our catalog or web site (www.dallee.com) for available speakers. Always try to use the largest
size speaker for the space allotted or multiple cluster's of four smaller speakers also works well.
Speakers can be attached with double sided tape, with glue 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.
Sounds produced via momentary switch closure are automated horn patterns. Non-user controllable
sounds include brake release and diesel prime mover sound automatically adjusted to speed and
load conditions.
A second speaker, wired in series with the main speaker, can also enhance sound quality and will
permit a higher volume without damage to the individual speakers. A tube with a speaker at each
end or a speaker in a doorway at each end of a body shell is an excellent approach. A four speaker
approach will yield the highest volume while still maintaining the 8 ohm minimum requirement.
Drawings for this are included in the speaker instructions.
INSTALLATION INSTRUCTIONS:The sound system consists of a printed circuit board, a speaker,
four 2-pin connectors with wires and one 3-pin connector 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. You can also find more
instructions on our web site (www.dallee.com). 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.
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.
The circuit board should be mounted so that at minimum, the volume control is accessible either
through the frame or via a hatch or a hole in the locomotive body shell. Be certain that the
components on the circuit board, or the speaker wires, do not come in contact with any metal
objects as such contact can destroy the sound system. The speaker should be mounted as per
available space bearing in mind that sound reproduction is enhanced when a speaker is properly
enclosed and baffled.
All sounds are discussed assuming that the sound unit is fully powered at all times. If only powered
from track power, the sounds will only start when sufficient track voltage is obtained.
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. Without a battery, the sound will not work at lower track voltages. For some this is not a
problem but for this sound system, since it goes through a startup sequence upon power up, it
would be advised to utilize a battery. Drawings are supplied for multiple types of connections. If
using batteries, we suggest the use of one 9 volt or 6 AA or 6 AAA batteries in series to maximize
volume potential and battery life. Rechargeable batteries can be used. When connecting the battery
(DC) power leads be absolutely certain that wires connect to the proper DC input leads.
PRIME MOVER (DIESEL): sounds range from idle to full RPM with eight notches. With no power to
the motor input (J3:2, J3:3) the sound system will produce engine idle sounds. As a throttle is
advanced to put the locomotive in motion, the "De" horn as well as a brake release will sound (see
below) and the diesel will accelerate to the correct notch setting for the locomotive speed. You can
also override the diesel's RPM via the "Force N8" input (J5:1). Whenever this input is switched to
J2:2 (ground) the prime mover will accellerate to Notch 8 (full RPM) thus simulating a heavy load
condition vs locomotive speed. Diesel shut down sound will occur whenever the "run/stop" input
(J5:2) is connected to J2:2 (ground). Whenever this pin is open (disconnected), the startup
sequence will occur.
If using reed switches, nstallation of them is easily done by making the appropriate wire connections
and placing the reed switch in the proper location for magnet activation. When removing the reed
BRAKE RELEASE: sound is produced when the throttle is advanced from the idle position. This
brake release should always precede locomotive movement but will only occur if the diesel sound is
actually at idle. For DC operators, this requires approximatly 1.5 to 2 volts of input voltage to sense
a running mode.
HORN: sound is controlled by the switch inputs. Two type of horn patterns are controlled via the
two inputs. J4:1 controls the "De, Dar" sound (Horn1), J4:2 controls the "De, Dar, De" pattern
(Horn2). Upon closure of the reed switch via an external magnet, radio receiver input, or other, the
sound system will begin to play appropriate Horn patterns. The "De" horn will also sound when the
locomotive is "pulling out" from a stop (locomotive sound must be at idle).
volume the shorter the battery life.
NOTCH ADJUSTMENT: full clockwise will yield notch #8 on the diesel at approximately 8 volts to
the track / motor. Rotate the control CCW to increase the voltage required to reach notch #8. Gauge
1 and other operators using higher motor voltages will probably want to set this control full CCW.
Sounds for this locomotive were recorded by Francis Leach of www.3d-companions.com
Other installation instructions can be found on our web site as well (www.dallee.com).
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
Wiring standards:
wires with a "•" ARE a connection!
wires crossing over (without a "•") DO
Diagram help:
Volume Control
Speaker Output
Notch Control
(speed set)
Reed Switch
electrical symbol
J3 connections:
1 - not used (RED)
2 - Motor 1 (BLACK)
3 - Motor 2 (WHITE)
SYNC - not used
Motor Select (J5)
1 - force N8 (red)
2 - motor sound
OFF (gray)
Remote Input (J4)
1 - Horn1 "De-Dar" (red)
2 - Horn2 "De-Dar-De" (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.
DO NOT touch the speaker wires to anything else, this will damage
the amplifier which is not covered under warranty!
J1 connections:
1 - track power 1 .....also AC input 1.............(RED)
2 - track power 2 .....also AC input 2.............(GRAY)
J2 connections:
1 - DC power "+" (RED)
2 - DC power "–" (GRAY)
3 ................. Conventional DC
4................. Conventional DC with
rechargeable battery
5 ..................DCC / Radio receiver
6 ..................Reed Sw / Magnet inst.
Other wiring / application notes can be found
on our web site under "Current Product
Instruction Index" then "Sound Related, misc".
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!
246 W. Main St.
Leola, PA 17540
(717) 661-7041
Track power installation without batteries
Red - no connection
Right Rail
either rail may be used. Right / Left
only used for reference.
Left Rail
Red - no connection
As stated previously, this connection is not suggested since this sound
system contains startup and shutdown sounds. Therefor, either utilize a
battery system as shown below or other power system. If utilizing this wiring,
leave the track voltage low while the sound system completes it's startup. Or
if that's of no concern, then just run the locomotive and after the sound
system completes it's startup sequence the horns will be able to operate.
Switch inputs
A pre-wired assembly consisting of plug
connections to J1, J3, and the "SPKR" to
AristoCraft locomotive pc boards is available
(item #998). AristoCraft connectors to make
your own with the included connectors is
also available (item #999).
DC track power installation using standard batteries
Red - no connection
Right Rail
either rail may be used. Right / Left
only used for reference.
track power
Left Rail
#524 SPDT switch.
Switch shown in the OFF
position. Drawn as a spst.
– +
9V, or 6-AA,
or 6-AAA
Battery power must not exceed 35 volts DC.
Use one 9 volt battery or a string of 6 AA or
AAA batteries. Battery life depends on the
volume setting and speaker impedance.
Typical operation of most sound systems,
with one good 9 volt battery, is about 8
hours, AA or larger maHr (milliamp hour)
batteries is well beyond 50 hours!
When using standard batteries and you want
the sound system to operate on track voltage
as well, you will need to add a single diode
(item 374) in series with the "+" wire as
shown (above right). J1 would then connect
to the track power as shown in the drawing
above. When connected in this manner,
whenever track voltage exceeds the battery
input voltage on J2, the sound system will
then draw it's power from the track and not
the battery. J3 needs to be connected as
shown on the above left diagram.
– +
9V, or 6-AA,
or 6-AAA
DC track power installation with rechargeable battery.
When track voltage exceeds battery voltage, the sound system will operate from track voltage instead of battery voltage.
Right Rail
either rail may be used. Right / Left
only used for reference.
Left Rail
2x1N4002 or equivalent diode (item #374)
R1 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 - 1.9 - Vbatt nominal charge voltage) / battery charge current
9V, or
6-AA, or
Switch inputs
#524 SPDT switch.
For 18 - 24 volt track voltage: Using item #647 (8.4v / 150 mahr) rechargeable battery: use 390
ohms, item #558, for a rapid charge at 24 volts input power. The rapid charge for item #647, is
set for a 7 hour time factor at full track voltage.
items wired
as pictured.
All items (D1, D2, R1, SW, battery connector) are available as item #996. Prewired as item #997.
If higher charge currents are desired, reduce the resistor value (and increase it's wattage) but
bear in mind that standard charge currents are 10% of the total mahr of the batteries over 16
hours. Since most don't operate that long, either external charging may be done or increased
charge currents may be used. But increased battery charge currents must also be offset by
shorter charge times.
Switch shown in the OFF
position. Drawn as a spst.
Battery power must not exceed 35 volts DC. Use one 9 volt battery or a string of 6 AA or AAA
batteries. Battery life depends on the volume setting and speaker impedance. Typical operation
of most sound systems, with one good 9 volt battery, is about 8 hours, AA or larger maHr
(milliamp hour) batteries is well beyond 50 hours!
above with rechargeable battery & external charger connection.
The on/off switch is to turn the battery power on for the
sound unit. Otherwise the sound unit will start when
sufficient track voltage exists. The battery will be
charged with or w/o the switch turned ON.
External power source.
R1 same value as
selected above.
The external power source can be connected to the engine via a
connector so it can be unplugged when operating the engine.
Three 1N4002 or equivalent diode (item #374)
Switch inputs
All connections to J1 and J3 are the same as shown above.
9V, or
6-AA, or
The voltage of this external
power should equal or be less in
voltage than the resistor value
selected for the track voltage
range used (see upper section).
If it is higher, then another
resistor needs to be placed in
series to lower the charge
DCC receiver installation using motor power for notch settings and
function control for HORN's, Full RPM, Shutdown Sounds ON / OFF
Connect motor
if present
track power input
No connection is
required to J2. All of
the sound system
power is supplied
from the track via J1.
S1 - HORN1 function. Connect to desired
function output of module. Activate low to play
S2 - HORN2 function. Connect to desired
function output of module. Activate low to play
Function key:
S1 - Horn1 (momentary)
S2 - Horn2 (momentary)
S3 - Force Notch 8
S4 - shutdown/main sounds off
These need to be connected to non-latching
receiver motor leads (Orange / Gray is
standard practice). If you are using a
seperate receiver merely connect the
motor leads to pins 2 (black) and 3
(white) 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 !!
S2 -> S4 - function. Connect to extra
function, if desired. When using an extra
receiver you can use either Forward or
Reverse lamp function output of module.
Normally not activated = "high".
Activated = "low" (function ON).
Connect S1 thru S4 to function control desired.
You do not need to connect functions you do
not intend on using.
Other receiver or controller installation using motor power for notch settings and
function control for HORN's, Full RPM, Shutdown Sounds ON / OFF
Connect motor
if present
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.
Connect S1 thru S4 to function control desired. You do not need to connect functions you do not intend on using.
Remember, all of these get switched to ground (J2:2) to operate the desired sound / function. Most radio receivers
either have a solid state switched output to ground or a relay type interface available to do so.
receiver motor leads.
Connect the motor leads to
pins 2 (black) and 3 (white)
of J3. The sound system
presents a load of 480 to
980 ohms (depends on
speed set control setting).
If using in a larger locomotive with
constant power, or as a stationary unit,
you can always add one of our 11 or 22
watt amplifiers! The amplifiers also have
treble and bass controls to tailor the
sound to your liking.
Item 671 - 11 watt, Item 672 - 22 watt.
Sample Reed Switch Installation
Reed switches mounted under engine or car
1 - Reed Switches - locate and prewire the reed switches as shown. Since they both connect to a
common wire, only 3 wires are needed between them and the sound board.
When operating with reed switches and magnets, it is necessary to orient the reed switch for the
best sensitivity. If you need to experiment with your magnet's polarization properties, connect the
reed switch to a small lamp and move the magnet about to turn the lamp on/off. This will give you
a very good idea as to which way the reed switch needs to be oriented vs the magnets
polarization. Reed switches can be easily mounted with double sided foam tape (item 388).
Mounting methods:
1 - Perpendicular to plane of track (fig1): The easiest to mount in most cases would be to mount
the reed switch perpendicular to the track plane. By doing so, you minimize the sensitive area
of the reed switch and make it more selective for what the magnet is going to operate.The
magnets are strategically located to trigger each function. By proper locating the magnets,
individual functions can be controlled (fig2). The reed switches can be mounted for inside or
outside of the rail activation as well.
2 - Parallel to plane of engine (fig2): Mount the reed switches 90° from that shown in the lower
portion of fig1. Position the magnets over the end area of the reed switches as shown in fig 2.
This way other rectangular magnets can be used as well. If you do not want this system to be
triggered by certain rectangular magnets but do want it to activate with item 988 magnets,
then orient the reed switch as shown in fig 1 and place the magnets directly under the reed
switch. This way you could make the engine more specific as to which magnets will trigger
the sound system.
The distance between the magnet and trigger needs to be 1" or less for reliable operation. When
traveling at fast speeds, and you do not get a trigger, either decrease the magnet distance or
place another magnet in the line of travel.
2 - Since one reed switch controls the Horn1 and the other controls Horn2, they need to be
mounted on opposite sides of the chassis. These are shown below, attached with double sided
tape (item 388), inside the fuel tanks end. To keep things consistent, use the right side of the
engine for Horn1 activation and the left for Horn2. By wiring all engines the same way, it is easy
to know which side activates which function.
Note: You may want to test the activation distance for the reed switches before final assembly.
Since not all reed switches are made alike, some will activate at a very low magnetic field
strength and others at a higher strength. The higher strength isn't the problem as much as a
lower strength. A lower strength reed switch might activate from a magnet located on the
opposite side of the rail (from a far distance). This is tested by using an ohm meter to test for
closure of the reed switches or by wiring to the sound system and passing a magnet for the
opposite activation.
Fig 1
view of
Horn2 Reed Switch in
front of fuel tank.
3 - for ease of disassembly, a 3 pin
connector, item 521, was used between the
fuel tank and bottom chassis. A hole is
needed in the chassis for these wires. Make
sure it is deburred properly.
Fig 2
S i nc e m a gn et s t r en gt h an d r ee d
s w i t c h s e n s i t iv i ty v a r ie s , y o u m a y
n ee d t o a dj u s t p l ac e me n t t o s ui t y ou r
n ee ds . T he ba s ic s c h e m e i s s h o w n
f or pr op er m a gn e t p l ac e me n t .
Basic Reed Switch wiring to the sound board.
D o no t pl a c e m ag ne t s exa c tly
op po s i t e o f e ac h ot h e r.
reed switches mounted
in engine or car shown
perpendicular (above)
or parallel to the track.
Horn1 &
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