Based on an operational of the time, this Popular Electronics circuit can be designed with any equivalent operational.
Found in a 90s Popular Electronics, this circuit interfaces the telephone line with an audio...
In this circuit, xx can be 05, 06, 12 or 15 for output voltages of these values. The integrated circuit...
April 2017 - TDK chip-on-ceramic components can be obtained from Mouser Electronics for 2.4 GHz...