Holtek Ht9170b 18DIP DTMF Receiver

Digital - A system that uses only 0s and 1s to transmit data

Frequency - A term used to describe how often something is done

Frequency - A wave frequency is the number of times a wave repeats within a given time

Filter - A device used to separate mixtures

Filter - An optical device to remove or enhance particular wavelengths of light.

Voltage - A measurement of volts.

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