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Prewired Audio Converter Transformer and LED Indicator Card
As previously indicated, the AV-V70 includes an installed 70Vrms Speaker Circuit Interface Card prewired to the
Audio Converter Transformer and the LED Indicator Card. Wiring to the Audio Converter Transformer includes both
the 25Vrms input wiring and the 70Vrms output wiring (see figure 9).
In addition to the Audio Converter Transformer wiring, the 70Vrms Speaker Circuit Interface Card is prewired to an
LED Indicator Card, located on the front of the AV-V70 enclosure. The LED Indicator Card includes a 24 VDC LED
and 70Vrms Speaker Circuit Interface Card trouble LED (see figure 10).
A+ A-
B-
B+
OUTPUT AUDIO 70V
70V 70V NC 25V 25V
AUDIO TRANSFORMER
+24 0 +24 0
V V V V
N/O COM
B+ B-
A- A+
J1
A
B
OUTPUT
STYLE
REMOTE LED
CONNECTIONS
POWER
TROUBLE
TROUBLE
25V AUDIO INPUT
Upper Transformer
Wiring (25Vrms)
Lower Transformer
Wiring (70Vrms)
Figure 8 – 70Vrms Speaker Circuit Interface Card 70Vrms Class A Wiring
Figure 9 – 70Vrms Speaker Circuit Interface Card Wiring to Audio Converter Transformer