Suggested by General Electric in a 1965 publication this circuit uses a light bulb. Can be changed to use LED and capacitor can be 22 uF.
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...