Jk-audio Voice Path User Manual download pdf (Page 4)

Connection (continued)

Handset Type Switch

The three position switch on the back of VOICE PATH

selects the type of microphone that is in the handset of

your telephone. When you push in the Playback button,

VOICE PATH replaces the handset microphone signal

with a circuit that must match the characteristics of the

handset microphone. The A B C selector switch covers

the main three microphone type.

Switch Position Handset Microphone Type

A Electret

B Dynamic

C Carbon

Note: Not all telephones are built alike so we cannot

guarantee VOICE PATH will work with any hand-

set design out there. We designed the interface

to work with most popular designs. If a conflict

arises it will typically be on the line input side. If

you attempt to send voice band signals down the

line input jack and the distant party complains that

the level is too loud or severely distorted

(clipping), try to lower the transmit signal on your

audio equipment. If this does not help, discon-

tinue use immediately.

Specifications

Input: Connector: 3.5 mm TRS cable

Input Impedance 10 k ohms

Level 250 mV RMS

Max input +12 dBM

Output: Connector: 3.5 mm TRS cable

Output Impedance 2800 ohms

Level 100 mV RMS

Max Output -16 dBm

Isolation from phone line 1500 Volts

Handset and Telephone connectors:

Modular 4pin/4wire handset jacks

Handset Compatibility:

Voice Path is designed to work with most

carbon, dynamic and electret handset mi-

crophone types.

Not for use with cellular telephones or telephones

that have a keypad in the handset.

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Jk-audio Voice Path User Manual Page 4