Sunday, 5 April 2015

audio - How exactly does one calculate the proper filter capacitors for the 567 tone detector?


I'm making a wireless remote control system using the 555 and 567 IC's.


Everything is working OK with the exception of the tone detector, yet I can hear the tone when I hook up a speaker to my circuit at the point where the tone detector can pick the same noise up.


I think it comes down to the input filter capacitor and output filter capacitor connected to the 567.


Currently I use 2.2uF and 4.7uF capacitors as filter capacitors, but there is nowhere online that dictates an equation for such capacitors and there's nothing that tells me what resistance to follow so I can even figure out a capacitor value.


The tone I'm trying to detect is a tone at 5Khz.



What equation do I use for the input and output filter capacitor for the 567 to successfully detect a 5Khz tone?




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