hi, i'm julian from indonesia. i' doing my final project right now, i'm trying to detect the call progress detector & Special Inforation Tone from the telephone line using LM567 to activate a bell on my system. is there any one of you can help me to do the schematics of lm567 to detecting the telephone tone????????
![Eek! :eek: :eek:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)