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I am trying to design a circuit that compares a recorded signal to a stock signal. If they are not similar it then inputs a signal into a circuit which will change the pulse of the led to stimulate a channel until these signals are relatively similar. (Feedback loop) It will take a input that (changes the frequency) in which the led pulses. Any help is great.

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  • \$\begingroup\$ You mean like a PLL? \$\endgroup\$ – Ignacio Vazquez-Abrams Nov 17 '14 at 20:29
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    \$\begingroup\$ What do you mean by similar? Frequency, waveshape, amplitude, etc. \$\endgroup\$ – Barry Nov 17 '14 at 20:50

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