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 any one of the sixteen standard DTMF tones.
The DTMF-16 can operate in one
of two possible modes: momentary or interlocked-latching. In momentary mode, the
output stays on for the duration of the incoming tone. 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 can be changed
to interlocked latching by moving one internal jumper.
The 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.
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