DTMF Decoder

The DTMF (Dual Tone Multiple Frequency) breakout boards decodes the key press from mobile phone to 4 digit binary code. If you've wondered how an IVR works when you call customer support, it uses an DTMF decoder. So whenever you press a key on your phone, it is decoded and it plays the pre-recorded messages. It can be used to control devices, move robots from a distance.

Features

• Based on MT8870 or compatible decoder.
• Works in differential mode
• Indication LEDs for the binary output
• Output pins taken out.

How to connect?

The board has a standard 3.5mm audio jack with which you can connect to phone. You may buy the standard 3.5mm audio cable. .

Downloads

• Schematic

For support on this product visit the learnings page.