DSchmidt Technologies' DTMF Solutions

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DTMF Decoder with Backlit LCD Display (part # DTMFLCD-C-G)

Features

Decodes all 16 DTMF tones (0-9, A-D, #, *)
Stores up to 2,048 digits. Even if the power is lost, tones are still saved! For years!
Delays between tones of 3 seconds or more denoted with a dash on the display and in memory
(each dash uses 1 memory location)
16 char by 2 line LED Backlit LCD display
- View tones as they are being decoded, review memory, show memory freespace.
True RS232 output voltages
- 9600 baud, 8 bits, no parity, 1 stop bit
- Decoded tones are sent out the serial port as they are decoded.
- Output memory contents to the serial port
RCA audio input jack for line level inputs
RJ11 phone jack allows you to directly decode tones from an analog phone line.
Pushbuttons pre-mounted below LCD allow you to scroll through memory,
Show memory freespace, or send memory contents to the serial port.
Click here for product dimensions.
Central office quality DTMF decoder IC
DC power requirements 5.5 to 18 VDC filtered, 30mA consumption, reverse polarity protected.
- Low dropout regulator and low power consumption makes it perfect for battery powered, portable operation
99% assembled and tested 'kit'. You hookup a power source.
User manual located here

NOTE: Though this device has an onboard RJ11 phone jack and a DB9 RS232 output jack, you CANNOT use both simultaneously due to isolation issues! If you must use both simultaneously, you will need to build this circuit to provide electrical isolation.

DTMF Decoder with Green Backlit LCD Display Price: $93.45

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DSchmidt Technologies is winding down. DTMF products are no longer popular, and everyday life is getting more and more busy.
For my existing business customers, you can still order what you need - contact us.
Click here for answers to commonly asked DTMF questions.

DTMF to RS232 DTMF Decoder (part # DTMF232-C-T or DTMF232-C-R)

Choice of input connector, RCA or terminal block
Decodes all 16 DTMF tones (0-9, A-D, #, *)
Accepts line level audio input directly
Central office quality DTMF decoder IC
LED indicator shows when a tone is detected
DB9 female connector for RS232 hookup

True RS232 voltages
Selectable 1200/2400/4800/9600 baud rate
Decoded tones are sent out the serial port as they are decoded.

DC power requirements 7 to 24 VDC filtered, 20mA
Assembled and tested. No case supplied
Click here for product dimensions.
User manual located here

NOTE: There is NO display. Tones must be viewed via the serial port.

DTMF to RS232 Decoder, choice of input type, assembled and tested Price: $45.15

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DTMF to RS232 DTMF Decoder with 2,048 digit memory (part # DTMF232-2048-A)

Stores up to 2,048 tones. Even if the power is lost, tones are still saved! For years!
Decodes all 16 DTMF tones (0-9, A-D, #, *)
Pauses of 5 seconds or more are marked by a '.' on the display and a carriage return from the RS232 port
RCA Audio input jack accepts line level audio input directly
Central office quality DTMF decoder IC
LED indicator shows when a tone is detected or memory is full
DB9 female connector for RS232 hookup

True RS232 voltages
Selectable 1200/2400/4800/9600 baud rate
Decoded tones are sent out the serial port as they are decoded.
Output tones stored in memory to the serial port

DC power requirements 7 to 24 VDC filtered, 20mA
Assembled and tested. No case supplied.
Click here for product dimensions.
User manual located here

NOTE: There is NO display. Tones must be viewed via the serial port.

DTMF to RS232 Decoder with Memory, Assembled and Tested Price: $52.50

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4 Channel DTMF to RS232 DTMF Decoder (part # 4CH_DTMF)

Need to decode more than one DTMF audio source but you only have 1 serial port available? This is for you!
Decode up to 4 channels of DTMF audio simultaneously. Tone identities are sent out the RS232 port at 9600 baud (9600,8,n,1)

4 independent audio input channels
Each channel consists of:
- An RCA Audio input jack which accepts line level audio input directly
- Central office quality DTMF decoder IC
- LED indicator to show when a tone is detected on a given channel
Simultaneous decoding of all 16 DTMF tones (0-9, A-D, #, *) on all 4 channels

For each tone detected, the channel letter (a, b, c, d) and the tone's identity is sent out the serial port.
(Example: a1b4d* means channel 'a' detected a 1, channel 'b' detected a 4, channel 'd' detected a *)
Minimum tone duration of 40mS ON / 40mS OFF

DB9 female connector for RS232 hookup

True RS232 voltages
9600 baud rate
Decoded tones are sent out the serial port as they are decoded.

DC power jack accepts a 5.0mm x 2.1mm plug, 7 - 24VDC filtered, auto polarity selection
Assembled and tested. No case supplied
Click here for product dimensions.
User manual located here

Note: all channels share a common ground. If your audio source needs to isolated from one another, you will need to provide an isolation transformer interface.

This product has a 1 week lead time.

4 Channel DTMF to RS232 Decoder Price: $114.45

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8 Channel DTMF to RS232 DTMF Decoder (part # 8CH_DTMF)

Decode up to 8 channels of DTMF audio simultaneously. Tone identities are sent out the RS232 port at 19200 baud (19200,8,n,1)

8 independent audio input channels
Each channel consists of:
- An RCA Audio input jack which accepts line level audio input directly
- Central office quality DTMF decoder IC
- LED indicator to show when a tone is detected on a given channel
Simultaneous decoding of all 16 DTMF tones (0-9, A-D, #, *) on all 8 channels

For each tone detected, the channel letter (a, b, c, d, e, f, g, h) and the tone's identity is sent out the serial port.
(Example: a1b4d* means channel 'a' detected a 1, channel 'b' detected a 4, channel 'd' detected a *)
Minimum tone duration of 40mS ON / 40mS OFF

DB9 female connector for RS232 hookup

True RS232 voltages
19200 baud rate
Decoded tones are sent out the serial port as they are decoded.

DC power jack accepts a 5.0mm x 2.1mm plug, 7 - 20VDC filtered, auto polarity selection
Assembled and tested. No case supplied
Click here for product dimensions.
User manual located here

Note: all channels share a common ground. If your audio source needs to isolated from one another, you will need to provide an isolation transformer interface.

This product has a 1 week lead time.

8 Channel DTMF to RS232 Decoder Price: $229.95

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DTMF Activated Relay (part # DTMFRLY-C-T or DTMFRLY-C-R)

DTMF activated relay. Set the 'combination' and when it is received, an on-board relay activates.
Choice of input connector, RCA or terminal block

Standard Features

Code easily settable and can be 1 to 50 digits in length.

Simple programming using a single pushbutton and your DTMF source!
Set code length to one if you need immediate relay activation when a certain tone is heard.
Code stored in non-volatile memory. Remembers code even in a power failure!
In toggle mode you can have a separate codes for ON and OFF activation

Decodes all 16 DTMF tones (0-9, A-D, #, *)
LED status indicator shows when a tone is detected and when relay is activated.
SPDT relay with 5A contacts
3 Operation modes can be selected
- Mode 1 - toggle relay, if power is lost, relay is off when power comes back on.
- Mode 2 - toggle relay, remember relay state if power is lost and reinstate it when power comes back on.
- Mode 3 - turn on relay for 1 to 9999 seconds (selectable) then turn off
RCA or terminal block input accepts line level audio input directly
Central office quality DTMF decoder IC
DC power requirements 7 to 24 VDC filtered, 90mA
Assembled and tested. No case supplied.
Easily hookup power and relay using installed terminal blocks
Click here for product dimensions.
User manual located here

DTMF Activated Relay, choice of input type, assembled and tested Price: $50.40

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Single Digit DTMF Activated Relay (part # D16-RLY)

Single Digit DTMF activated relay. Onboard relay is activated for as long as your chosen tone is heard.

Just a few examples of what you could control

Electric latched doors and gates
Remote video camera pan and tilt functions
Gymnasium turnstiles
Lights and appliances

Features

Easily choose the DTMF tone to activate the relay by installing the supplied jumper
- Decodes all 16 DTMF tones (0 1 2 3 4 5 6 7 8 9 A B C D # *)
LED status indicator lights when any tones are detected
LED status indicator lights when your chosen tone is heard and the relay is activated
SPDT relay with 5A contacts
RCA Audio input jack accepts line level audio input directly
Central office quality DTMF decoder IC
DC power requirements 7 to 24 VDC filtered, 90mA
Comes with terminal blocks for easy power and relay hookup. No soldering required
Assembled and tested. No case supplied.
Click here for product dimensions.
User manual located here

D16-RLY Single Digit DTMF Activated Relay, Assembled and Tested Price: $40.95

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