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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. We recommend using optics since they
can switch much faster, don't bounce, and do not interfere with the mechanical operation of the axle.
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!
adding manual control to the IN LOCOMOTIVE DC SOUND system as a
stationary unit to adjust diesel notches or steam chuff rate.
Connect input power, speaker, and all other connections as shown in stationary or other types of
installations except no input connections should be applied to the DC motor/track input
header (J3) pins 2, or 3. Instead, connections should be done as shown below. All other
input power, speaker, switch connections should be done as before.
Basic setup for both types of operation: Set Chuff Rate (speed set) full CCW. The
potentiometer, transistor, and a knob can be obtained directly from us as item#602 but they
may not appear on the price schedule - call or write for prices.
no connection
Black
White
+
Red
–
Gray
Don't forget to connect either J2 or
J1 to the appropriate power supply.
Synchronization of Exhaust Chuff
C
50K
B
CW
E
2N4401 (NPN) or equiv.
External RPM control
potentiometer with knob &
transistor (item #602)
E B C
10
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.
For extra 2 and 3 pin ultra-miniature connectors, see item's 757 and 758.
They are listed under Accessory Items / Connectors.
adding remote volume control when using an Auxillary Amplifier
With single sound systems, connect the gray wire from the speaker output to input "I". Connect
the rest as shown.
If using two sound system as shown on page 9, connect the junction of the two sound systems
to the capacitor as shown on page 9, then merely add the potentiometer as shown. This will only
work properly if the amplifier has an industry standard auxillary input.
I
audio input from
+
1 mfd capacitor
sound system
Observe polarity!
1
1 2 3
Remote
volume
2
control
3
viewed from front
External Volume control
with knob and capacitor
(item #601)
using an Auxillary Amplifier with matching transformer input
matching transformer
speaker output
8 - 16
ohms
WHITE
GREEN
BLACK
RED
auxillary AUDIO AMPLIFIER,
Item #671 or #672
Gray
Amplifier DC input power
Red -> +DC
1
Black -> ground
2
3
This needs to be the same
as the sound system power.
matching transformers
can be found in many
audio shops. They are
Amplifier
used for power amplifiers
Input
found in car systems.
amplifier input impedance
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