The DTMF-8 DTMF Decoder is an inexpensive, self contained, DTMF
(dual tone multiple frequency) or touch tone decoder board which
permits users to remotely control, via radio or other audio
producing source, the on or off state of eight devices or relays.
For larger applications several DTMF-8 boards can be attached to the
same control audio source to control dozens of devices. DTMF-8
supports four modes of operation. These mode settings control how
the DTMF-8 DTMF Decoder behaves. Password support is also available
for increased protection from unauthorized entry. All information is
stored in non-volatile eeprom memory.
Dimensions: 4 1/2" x 2 1/2" x 9/16"
Weight: 1.8 oz.
Input voltage: 12.0 to 14.0 volts DC (250ma max.)
Operating temperature: -10 C to +70 C
Microprocessor: Microchip PIC16F84-04I/P (4 MHz)
DTMF/Touch Tone receiver: Motorola MC145436AP
Audio input impedance: 100K Ohms
Audio input level: .1v to 5.0v peek to peek
Relay driver: ULN2803 (eight open collector outputs 500ma max.
Relays: Omron G5V-1-DC12 (sealed)
Relay contact rating: 1 amp @ 12 volts DC, 1/2 amp @ 120 volts
Relay contact life: 5,000,000 operations
Factory default mode: Mode 1, no password
Password length: 0 to 9 digits
Valid password digits: 0123456789ABC*#
DTMF-8 modes of operation:
||All eight relays are latched.
Program mode: Press 1.Relays are turned on (*) or off
(#) and remain in that state.e.g. 4* turns on relay 4, 4#
turns the relay 4 off.
||All eight relays are momentary.
Program mode: Press 2.The relay is in the on state while the
corresponding DTMF tone is being received and in the off state
when the DTMF tone is absent. This is useful for controlling
devices like pan and tilt cameras.e.g. While 7 is being
pressed relay 7 is on.
||Mix of mode 1 and mode 2.
Program mode: Press 3 followed by the number of relays to be
latched (1-7). The remaining relays are momentary.e.g. After
the user programs 3 for this mode and enters 2 then relays 1 and
2 are latched (like in mode 1), and relays 3-8 are momentary
(like in mode 2).
||All eight relays are latched and mutually exclusive.
Program mode: Press 4 followed by the relay number that will
turn on by default whenever the DTMF-8 DTMF decoder board is
powered up (1-8). This mode is for simplified control of latched
relays (no need for * or #). The relays are mutually exclusive
which means only one of the eight relays will be on. An example
application for this is video camera switching where only one
source can be selected at a time.e.g. Pressing 8 turns on
relay 8. Then pressing 1 turns off relay 8 and turns on relay 1.
The DTMF-8 DTMF Decoder is designed to control eight devices (via
relays) but it is possible to control more devices by attaching
multiple boards to the same incoming audio source and setting a
password (more of a board ID in this case) for each board.
Warranty & Service:
If the product fails to perform as described in our product
description or specification, within 90 days from the date of
shipment to the buyer, we will repair or replace the product and/or
accessories originally supplied. Failure due to improper
installation, misuse, abuse or accident is not covered by this
warranty. Incidental and consequential damages are not covered by
this warranty.The buyer must obtain a Return Material Authorization
by calling (248) 588-4400, and shipping the defective product to
Intuitive Circuits, 3928 Wardlow Ct., Troy, MI 48083, freight
prepaid. After the warranty expires, we will promptly supply an
estimate for the repair cost.