Jul 31, 2010 #1 H huge211 Newbie level 1 Joined Jul 31, 2010 Messages 1 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,287 hi i want to use an inductive amplifier to detect audio tones present on a cable in a similar way to these tone testing kits (**broken link removed**) when a tone is detected (between 500hz and 3000hz) i want to light an led. i also found this circuit (**broken link removed**) which may be useful. i have no contact with the cable, so a sensitive inductive amplifier is the way forward! thanks for reading this! JP
hi i want to use an inductive amplifier to detect audio tones present on a cable in a similar way to these tone testing kits (**broken link removed**) when a tone is detected (between 500hz and 3000hz) i want to light an led. i also found this circuit (**broken link removed**) which may be useful. i have no contact with the cable, so a sensitive inductive amplifier is the way forward! thanks for reading this! JP