CircuitWerkes DTMF-16 TouchTone® Decoder & Silencer Option

DTMF-16 Connector Side

Optional Single or Dual Rack Mount Available

The DTMF-16 is excellent for controlling remote satellite receivers, network switching equipment, repeaters, or virtually any application where local control is inconvenient or impossible. Simply connect the DTMF-16's bridging input across an audio line and it's outputs will activate whenever a DTMF tone is received. The DTMF-16 is an inexpensive and convenient way to interface many news services to automation systems. For services using DTMF signals on voice channels, an activation delay prevents false trips.

The Silencer™ equipped DTMF-16 takes its audio feed directly from your satellite receiver or other source. The audio output of the DTMF-16 feeds program audio to your console or switcher input. The control tones are automatically muted from the audio path. If your program material regularly contains Touch-Tones®, we will custom shift your control tones so that "normal" Touch-Tones pass through without muting.

The CircuitWerkes DTMF-16 is a fully programmable TouchTone® decoder that can process single or sequences of tones.  TWO activation codes are available for each output (though you may choose to use only one).

> 2 DPDT & 2 SPST relay outputs (4 relays)
> 12 High-current (Darlington) optocoupler outputs
> Outputs programmable as momentary, latching,or interlocked latching outputs
> Any output can be programmed for any tone or sequence up to 6 digits long
> Relay outputs on Screw terms, optocoupler outputs are on a standard D-25.
> High impedance, unbalanced bridging input accepts a wide range of input levels
> Built-in anti-falsing circuit eliminates errors when used on program lines & speech circuits.
> Programmable via serial port using terminal program.  Decoded outputs also appear serially.
> All ICs socketed
> Power supply included
> Two year limited warranty.

The Silencer option board for the CircuitWerkes DTMF-16 Touch-Tone Decoder provides an inexpensive and convenient method for using DTMF remote-control tones in your program path without having the Touch-Tones on the air!


Application Notes for the CircuitWerkes DTMF-16 TouchTone® Decoder 

The DTMF-16 listens to an audio source (practically any audio source) and activates its appropriate output when it hears the matching DTMF tone or sequence of tones.

All of the outputs are fully programmable and can respond to any tone, or sequence of tones (up to six digits).  Four of the outputs are relays (two are DPDT for switching audio or other complex circuits).  The remaining two relays are SPST for simple GPI or contact closures.  All relay outputs appear on captive screw terminals.  The remaining 12 outputs are opto-coupled Darlington transistors. They are capable of operating practically any computer or logic input. They can be used to source or sink current (up to 150mA), making them ideal to drive slave relays or be used in place of relays in most DC applications.

The DTMF-16 can operate in one of four possible modes: momentary, latching (with distinct on and off codes for each output), momentary after end of tone or interlocked-latching. In momentary mode, the output stays on for the duration of the incoming tone. Latching mode turns a relay on until the unlatch tone (or tones) are received.  The momentary at end of tone only activates the output once the tone has ended.  This output is for a fixed duration.  Interlocked-latching mode keeps the most-recently selected output on until a different DTMF tone is entered. The units are shipped from the factory set for momentary operation but all outputs can be programmed for any mode via serial terminal.

Here's what some users are doing with their DTMF-16s:

  • Decoding Automation Tones from radio networks (connected to satellite receiver) and interfacing them with your automation system.
  • Backup transmitter control over STL, radio, or telephone coupler.
  • Radio remote control of camera pan & tilt heads.
  • Appliance / Computer control over telephone or radio link.
  • Firing cart decks / digital recorders in studios (simultaneously muting audio channel) from remote location.
  • Controlling an attention light at a remote broadcast via FM subcarrier.
  • Electronic outdoor billboard control via FM subcarrier.
  • Parade-Float control via radio link. Online control of RPU gear and radio repeaters.

Touch-Tone® is a registered Trademark of AT&T