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Other receiver or controller installation using motor power for notch settings and
function control for HORN, BELL, Full RPM, Main Sounds ON / OFF
speaker
Function key:
S1 - Horn (momentary)
S2 - Bell
S4
S3
S1
S2
S3 - Force Notch 8
S4 - Main sounds off
S1 - HORN function. Connect to desired
function output of receiver or
activated switch. Activate low to
play HORN. This needs to be a
momentary operation.
using SIGNAL TRANSISTORS for remote control of the HORN, BELL, and other functions.
This is possible when both the receiver and sound system are operating
from a common supply. The common supply can be either fixed track
voltage or fixed battery voltage. Since both the sound system and the
receiver are operating on the same supply, the common "—" power
would be the same. This circuit relies on the receiver having a logical
"HI" voltage when the remote functions are activated. Keithco and other
users requiring an inverted signal can use this optional interface circuit.
If you have another function available you could operate another function
such as a forced full RPM. Connect another transistor as the Horn and
Bell transistors but connect the collector of the transistor to the S3
function input.
Black
White
+
Red
–
Gray
Connect S1 thru S4 to function control desired.
You do not need to connect functions you do
not intend on using.
S2 - BELL function. Connect to
function output of
receiver or activated
switch. Activate low to
play BELL.
M
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.
S2 -> S4 - function. Connect to receiver
function or switch, if desired.
Normally not activated = "high".
Activated = "low" (function/switch ON).
C
HORN function
of receiver
B
Q1
R1
E
C
BELL function of
receiver
B
Q2
R2
E
R1, R2 - 1.0k 1/4 watt
(Brown, Black, Red)
Q1, Q2 - 2N4401 or equivalent NPN transistor
7
receiver
Connect the motor leads
to pins 2 (black) and 3
Connect motor
(white) of J3. The sound
if present
system presents a load of
480
(depends on speed set
control setting).
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.
If using as a stationary unit or in a larger
locomotive, 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.
See page 8 and 9 for wiring details
when using one of these amplifiers.
to Horn input of
sound board
to Bell input of
sound board
These parts can be obtained directly from us but they do
not appear on the price schedule - call or write for prices.
motor
leads.
to
980
ohms
2N4401
(front view)
E
C
B
COMMON of receiver
("-"supply) or J2 pin2 (gray).
These are the same since
both operate from the same
supply.
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