Page 2
1.2
Limitations
This module is designed to pass speech. Other signals such as data, music and morse (CW) will, to
some degree pass through, but the integrity of these signals cannot be guaranteed. Like the
NEDSP1061-PCB module it is designed to be placed in a low-level audio path (up to 1V p-p) only,
although there is a level adjustment on the module which will require adjustment. The output will
not drive a loudspeaker or other high-power load.
1.3
Module connection and Mounting
Connections to the module are made by a row of 10 plated through holes to one end which form
PL2
. The holes are on a 2.54 mm (0.1”) pitch which allow the use of Straight or Right
-angle pin
headers or direct wiring. This makes a flexible connection arrangement and allows the using to be
mounted either vertically or horizontally, plugged in or soldered directly to the target system.
PL1, seen on the right of the picture above,
is meant for programming of the 1901-KBD
module only.
Connections to the 1901 are via PL2, as
given in the table opposite.
Whichever method of connection is used, ensure that the PCB is supported by using at least 2 of the
Pin No
Name
Description
1
N0
BCD lsb noise reduction bit 0
2
N1
BCD noise reduction bit 1
3
N2
BCD msb noise reduction bit 2
4
N/C
Do Not Connect
5
Vin
Vin Supply Voltage (5V to 20 V)
6
N/C
Do Not Connect
7
0v
0V connection
8
Noff
Noise Reduction On/Off pin
9
In
Audio Input
10
Out
Audio Output
PL2 pin 1
Input Level adjustment
Output Level adjustment
PL2 pin 10
Overload
LED
