Toa IC-100 Series 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

C

1k Ω1/4 watt

1k Ω1/4 watt

10µf 50V

Call Switch

(optional)

Privacy Switch

(optional)

A

BSpeaker with 25V Line

Matching Transformer

CN6 ~ CN20

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

A

B

C

1k Ω

1/4 watt

CN6 ~ CN20

10µf

50V

1k Ω

1/4 watt

10µf

50V

330 Ω

1/4 watt

External Amplifier

with recommended input transformer

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5

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