Electronics > Electronics

Recognizeing a frequency

(1/3) > >>

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

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

the G8870 decodes DTMF Freqs.

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

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


[0] Message Index

[#] Next page

Go to full version