The integrated circuit used is no longer common today. The circuit is from Motorola's 1990 Linear Databook. The characteristics are given in the table.
This circuit makes use of an optical coupler to isolate the telephone line. The circuit is from...
This circuit was found in na old latin american magazine. The circuit uses two germanium...
A complete test for opto-couplers can be made using the circuit Bellow. The function generator...