PANTHER 300M INTERNAL/EXTERNAL
SPEAKER OPTION
(THIS SCHEMATIC ALSO APPLIES TO PUBLIC ADDRESS)
WHEN THE INTERNAL/EXTERNAL SPEAKER OR PUBLIC ADDRESS OPTIONS ARE APPLIED. AUDIO FROM THE SPEAKER AMP
LEAVES THE RADIO ON OPTION CONNECTOR PIN 3 AND GOES TO THE COMMON SIDE OF AN SPDT RELAY.
WHEN INTERNAL SPEAKER IS SELECTED, THE RELAY FLOATS. THE NORMALLY CLOSED RELAY CONTACT APPLIES AUDIO
BACK INTO THE RADIO TO THE INTERNAL SPEAKER ON OPTION CONNECTOR PIN 2. (IT IS ASSUMED THE INTERNAL 3-PIN
JUMPER IS ON PINS 2 & 3.)
WHEN THE EXTERNAL SPEAKER IS SELECTED, THE RELAY IS ENGAGED. AUDIO IS APPLIED TO THE NORMALLY OPEN
CONTACT THAT THEN CONNECTS TO THE EXTERNAL SPEAKER.
ONLY THE SPKR_1 SIDE OF THE AUDIO AMP'S OUTPUT IS SWITCHED. THE SPKR_2 SIDE OF THE AUDIO AMP IS
CONNECTED TO BOTH SPEAKERS.
OUR SPEAKER RELAY KIT INCLUDES THE 19A149299P1 RELAY, WIRE, AND A FUSE. THE CUSTOMER IS RESPONSIBLE FOR
INSTALLING AND PROVIDING POWER TO THE RELAY.
JUMPER POSITIONS
1-2
USED WHEN THERE IS NO INTERNAL/
EXTERNAL SPEAKER OPTION
2-3
USED WHEN THERE IS AN INTERNAL/
EXTERNAL SPEAKER OPTION
-
+
AUDIO IN
RADIO AUDIO
AMP
INTERNAL
SPEAKER
3 PIN
JUMPER
uP PORT
OPEN COLLECTOR
TRANSISTOR
HORN/SPKR 15
SPKR 1 3
INT SPKR 1 2
SPKR 2 4
INT SPKR 1
3
2
SPKR 1 1
SPKR 2
SPKR 2
SPKR 1
8 OHM
5 WATT
INT
EXT
300M RADIO
RPM 113 7674/1
OPTION CABLE
RADIO
CONNECTOR
DB 25
CONNECTOR
4
2
3
15
18
5
6
24
P3
J100
AUDIO OUT (SPKR_2 SIDE OF AUDIO AMP)
INTERNAL AUDIO BACK INTO RADIO
AUDIO OUT (SPKR_1 SIDE OF AUDIO AMP)
RELAY CONTROL LINE
COM
SPDT RELAY
(19A149299P1)
SPEAKER RELAY
FUSE
1A
BATTERY A+
OR
IGNITION A+
EXTERNAL
SPEAKER
4 OHM
10 WATT
EXT SPEAKER AUDIO
SPKR 2
NO
NO
(LOW FOR EXTERNAL SPEAKER)
Figure 12 – I
n
ternal/
Ex
terna
l Spea
k
er Rela
y
