VS-900 Security Intercom Systems
Application Note
Using a Speaker and 25V Line-Matching
Transformer as a VS-900 Sub-Station
Summary
You can build a simple VS-900 sub-station using readily available components.
Details
The configuration shown below supports half-duplex conversation, scan monitoring,
and paging. With the addition of a call switch, the speaker can initiate a call-in to a
pre-programmed master station. Note: Connect only one speaker assembly to each
VS-900 port.
Diagram
10
µ
f 50 V
VS-900MF
VS-900RS
RS1 ~ RS4
A
B
C
Line 1 ~ 16
(CN1 ~ CN4)
1 k
Ω
(1/4 W)
Call Switch
(Optional)
25 V 1 W
+
TOA Electronics, Inc.
601 Gateway Blvd., Ste. 300
So. San Francisco, CA 94080
1-650-588-2538 / 1-800-733-4750 V1,
All Rights Reserved, 2002
