3
West Mountain Radio
Operating Manual
Electrical Connections
1
Not Used
NC
2
Power
Reg3.3VDC, 98mA typical
3
Power
Digital Ground
4
Power
Analog Ground. For proper operation, Analog
Ground must connect to Digital Ground on
your PCB
5
In
Audio Signal In. Maximum signal level (volume
control fully clockwise) 40mVpp
6
Out
Audio Signal Out. Maximum signal level: 2Vpp into
a high impedance load, 560mVpp into
8 Ohms
7
In Optional
Filter control pot wiper (0-3.3V)
8
In Optional
Tone control pot wiper (0-3.3V)
9
In Optional
Volume control pot wiper (0-3.3V)
10
Out Optional
Clip LED control - 0 or 3.3V - Requires external
limiting resistor. Hi output indicates clipping.
11
In Optional
Serial interface (CLRmodule RX) 0-3.3V
12
Out Optional
Serial interface (CLRmodule TX) 0-3.3V
13
In Optional
PTT signal (0-15VDC) - Active lo
14
In Optional
Reset - Active Low (may be left unconnected)
Pin 1
Pin 13
Pin 14
Pin 2
