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Stationary DC power installation using track power for notch setting.
speaker
Switch key:
S1 - Whistle (momentary)
S2 - Bell
S3 - Cylinder blow down
S4 - Main sounds off
#618 SPST momentary
Switch shown in the OFF position.
S4
S3
S2
S1
#524 SPDT switch.
Switch shown in the OFF position.
Stationary AC power installation using track power for notch setting.
speaker
Switch key:
S1 - Whistle (momentary)
S2 - Bell
S3 - Cylinder blow down
S4 - Main sounds off
S3
S4
S2
S1
You can also add an auxillary Amplifier, see pages 8, 9, and 10.
Black
White
+
Red
–
Gray
push button switch.
You can also add an auxillary Amplifier, see pages 8, 9, and 10.
Black
White
Red
Gray
+
Red
–
Gray
Right Rail
Left Rail
either rail may be used. Right / Left
only used for reference.
ON / OFF
#524 SPDT switch.
switch
Switch shown in the OFF
position. Drawn as a spst.
Right Rail
either rail may be used. Right / Left
only used for reference.
Left Rail
+
#524 SPDT switch.
Switch shown in the OFF position.
Drawn as a spst.
extra filter
capacitor -
observe
polarity !
5
fixed DC power - must not exceed 24
volts DC. If you have a HUM or
other static noise in the audio output
it is because this power is not
+
filtered
enough.
Add
electrolytic capacitor (470 mfd @ 25
vDC
or
larger)
across
supplies output (when power is off).
Make sure you observe the polarity
–
markings of the capacitor !
ON / OFF
fixed AC power 10 - 18 vAC you MUST
switch
NOT EXCEED 18 volts AC. DC voltage
created from AC is 1.414 X vAC, 18vAC
= 25 vDC !
A HUM in the audio output is because
the DC power is not filtered enough. Add
a large electrolytic capacitor (470 mfd @
25 vDC or larger) across the DC output
as shown (when power is off). Make
sure you observe the polarity markings
of the capacitor !
a
large
this
DC
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