tonefrequency detector circuit

Posted on Feb 4, 2014

This is a design circuit for tone/frequency detector (decoder) circuit that can be used to detect the presence of a signal with a certain tone. The output of the circuit will be active if the signal is the same tone with the tone of a series of internal oscillator. LM567 is one of decoder that we can use. This is the figure of the circuit; The LM5

tonefrequency detector circuit
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67 and LM567C are general purpose tone decoders. Both are designed to provide a saturated transistor switch to ground when an input signal is present within the pass band. The circuit consists of an I and Q detector. Both, I and Q detector are driven by a voltage controlled oscillator which determines the center frequency of the decoder. To independently set center frequency, bandwidth and output delay, external components are used.

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