Phones Circuit | Next Electronics

CMX469A 1200/2400/4800 Baud FFSK/MSK Modem

CMX7031Q1 is a sub-package of CMX7031. For the full description, please refer to CMX7031. The datasheet for CMX7031Q1 can be downloaded below. By Consumer Microcircuits Limited. The CMX7031Q1 is a specialized integrated circuit designed for use in communication systems, primarily focusing...

Remote Control using DTMF

Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from...

Telephony Circuits and DTMF Circuits

This circuit is designed to support nine independent telephones using a single telephone line pair, allowing for operation at nine different locations. It includes a bidirectional telephone line simulator that does not require actual telephone lines, enabling the coupling, testing,...

CMX7031Q1 The Two-Way Radio Processor

The CMX866 is a multi-standard modem designed for use in telephone-based information and telemetry systems. Control of the device is achieved through AT commands via a simple 9600 b/s serial interface, which is compatible with various types of host controllers....

Modem/Fax Protector For Two Computers Circuit

This modem/fax protector can be utilized in telephone-line connections between a PC or a terminal and a remote computer. In this circuit, the surge voltage protectors (SVPs) are rated at 230 V. Additionally, a proper grounding is essential for optimal...

dtmf shield

This is the working prototype. The Eagle files have some minor changes made to them. Some mistakes have been fixed, and a few parts have been repositioned. This one is for the phreakers of the past. It is a simple...

DTMF Remote Domestic System Control

The following circuit illustrates a DTMF (Dual Tone Multi-Frequency) Remote Domestic System Control Circuit Diagram. Features: DTMF signals can be transmitted over a radio. The DTMF Remote Domestic System Control Circuit is designed to enable control of domestic appliances through DTMF...

Telephone DTMF decoder Display

The given circuit, when connected in parallel to a telephone, displays the number dialled from the telephone set using the DTMF mode. This circuit can also show the number dialled from the phone of the called party. This is particularly...

DTMF Tone Decoder

This project displays telephone numbers decoded from tones. A microphone picks up the tones, a preamplifier boosts the signals, an SSI-202 DTMF chip decodes the tones, a Basic Stamp acts as an interface to an LCD display and also provides...