The objective of the project is to decode dual tone codes into digits which are later interpreted by microcontroller. This device is very useful for decoding Dual Tone Multi Frequency (DTMF) generated ...

The DTMF extension project is intended to detect DTMF tones and decodes them to binary digits that can be easily read by a microcontroller which can decide what jobs to perform. The DTMF extension ...

Though many of us will never have experimented with it, most readers should be familiar with DTMF as the tones used by the telephone system for dialling. If your youth was not misspent mashing 4-4-2-6 ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Symetrix has released the 2 Line Analog Telephone Interface Card for SymNet. The card integrates ...

Sometimes you start building, and the project evolves. Layers upon layers of functionality accrue, accrete, and otherwise just pile up. Or at least we’re guessing that’s what happened with [Varun ...

Cimarron Technologies Corp.'s C Plus II Display/Decoder has a single window display with a review of last 20 messages. The device time stamps all messages via serial printer port (RS-232). It features ...