JK Audio Voice Path - Manual (Page 4)

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.
9
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.