The PCB has been designed to allow 3 input configurations: unbalanced audio, an Electret microphone or balance audio to be connected. When an Electret microphone is connected it can pick-up tones from a speaker phone a few inches away.
This kit will display received DTMF characters
3 input configurations
2 line x 16 character display included
Our DTMF Display kit can display up to 32 characters (16 per line). The display can be cleared by a button (not supplied) or can auto clear on a timed basis from receipt of the last character.
The kit is supplied with a backlit display, a 220 ohm ½ watt resistor (ideal for 12-14V supply) is included on the PCB and a jumper enables the backlight.
Connecting a momentary on button between the button input pin and 0V pin clears the display on pressing, however holding the button during power-up enables the timed reset mode. In timed reset mode the display is automatically cleared 10 seconds after the last character is received.
Runs from 7 to 16V DC at a few mA.
DTMF DISPLAY VIDEO
WHAT’S IN THE BOX?
Complete kit of parts includes a pre-programmed PIC micro, gold plated PCB, LCD display, and nuts/bolts/spacers. This kit is supplied with a backlit display, a 220 ohm ½ watt resistor (ideal for 12-14V supply) is included on the PCB and a jumper enables the backlight.