Electronics > Electronics

Recognizeing a frequency

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555 timer chip guy:
Dos any one have a circuit that can recognize a specific frequency.

sdk32285:
do a google search for a notch filter or bandpass filter.
you can use an op amp or a simple RLC circuit.

robot321:
the G8870 decodes DTMF Freqs.

555 timer chip guy:
It needs to be able to recognize square wave forms.

sdk32285:
maybe a DAC before the notch filter. Or use a cap in parallel with the receiver to convert to sinusoidal. I don't know of any offhand but they make tone decoder IC's which also might work

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