Toa IC-100 Supplementary Manual

Product Support

Using a Speaker and 25V Line-Matching
Transformer as an IC-100 Sub-Station

Article ID: 1001expl
Created: 90.12.03
Modified: 97.04.09
Category: IC-100 Stations
Issue: Installation

Summary

You can build a limited function IC-100 sub-station using simple, readily
available components.

Details

TOA designed its IC-100 sub-station ports for connecting speakers equipped
with 25V line matching transformers. DC signaling between those ports and
TOA sub-station hardware provides additional functions.

The sub-station shown below supports half-duplex conversations and the
reception of pages, time signals and audio program (BGM). Optional switches
add call-in and privacy functions.

For call or privacy LED indication, or for initiating a call while receiving a
page, install an RS-100 Switch Panel or an RS-102 Call Module. For private,
duplex conversations, install an RS-110 Handset Sub-station with either an
RS-100 or an RS-102.

Diagram

LU-100

A
B

10µf 50V

1k Ω 1/4 watt

1k Ω 1/4 watt

Speaker with 25V Line
Matching Transformer

Call Switch
(optional)

Privacy Switch
(optional)

CN6 ~ CN20

A
B
C

Product Support

Connecting an External Amplifier to an IC-100
Sub-station Port

Article ID: 1004expl
Created: 90.06.12
Modified: 97.04.09
Category: IC-100
Issue: Installation

Summary

Connecting an external amplifier to an IC-100 sub-station port provides that
amplifier with all of the audio distribution features of an IC-100 sub-station.

Details

The circuit shown below uses capacitors for blocking the DC signaling
voltages normally used by IC-100 sub-stations. Resistors drop the speaker
signal to line level. TOA recommends transformer isolation whenever you
interconnect systems. Consider using TOA's 900 series amplifiers with "B"
series balanced input modules.

Diagram

LU-100

CN6 ~ CN20

A
B
C

10µf
50V

10µf
50V

1k Ω

1/4 watt

330

1/4 watt

1k Ω

1/4 watt

Ω

External Amplifier

with recommended input transformer