Description

DTMF Decoder 3.3v MT88L70

This DTMF decoder uses the MT88L70, powered by 3.3v and interfacing with 3.3v GPIO to decode the touch tone keys.

It has an RJ phone jack and 600:600 transformer to connect to a phone line to pick up audio, listening for DTMF tone pairs.

This is intended as a development/testing accessory, used with a phone line simulator (not connected to a live phone service).

If using it on a live telephone line, ensure all regulations and laws are followed.

Schematic and Layout

Design Files

https://github.com/GadgetReboot/DTMF_Decoder_3V3

Download Gerbers Download BOM(Bill of materials)

Mar 19,2024

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DTMF Decoder 3.3v MT88L70

DTMF Decoder breakout board with 3.3v logic outputs

755

Published: Mar 19,2024

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BOM(Bill of materials)

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Topic

Breakout Board Projects

Misc

Retro Stuffs

Development Board Retro dtmf decoder phone line

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DTMF Decoder 3.3v MT88L70

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