rohini_123
New Member
hi
.
i want to connect either telephone handset MIC or ITU MODEM Tx (CMX869) to one common TX line of SLIC (Subscriber Line Interface card) for PSTN line.as i thought MIC impedence will be high therefore i am useing opAMP as a isolation purpose(unity gain) and from data sheet of modem i found that there is a buffer used in the o/p stage of modem.
please go through the attached file"CONNECTION" and suggest me some thing useful.
rohini
.
i want to connect either telephone handset MIC or ITU MODEM Tx (CMX869) to one common TX line of SLIC (Subscriber Line Interface card) for PSTN line.as i thought MIC impedence will be high therefore i am useing opAMP as a isolation purpose(unity gain) and from data sheet of modem i found that there is a buffer used in the o/p stage of modem.
please go through the attached file"CONNECTION" and suggest me some thing useful.
rohini
