This DTMF controller is built based on PIC16F84A Microcontroller, MT8870 DTMF receiver, and an ULN2803A relay driver. The Controller has 8 OC outputs to drive 8 5/12V relays of any type. In addition to 8 OC outputs, header/terminal socket also provides 12V, Ground & 5V (for pull-ups only).
This ATmega32-based project describes the implementation of a phone line audio and event recorder originally devised for technical support call center quality assurance purposes. However, it is a reasonably generic telephony platform that can be easily adapted for other applications, such as an answering machine/interactive voice response system
This project is a dialer box that connects to the phone and can be used to store and dial phone numbers, pins, and credit card numbers. The project uses PIC 16F690 microcontroller and a NTE1690 DTMF dialer chip.
Because this is an IP phone and I cannot just send the DTMF tones over the line, the [...]
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