Key benefits Simple integration with dial keypads and microcontroller units (MCUs). The module directly interfaces with a keypad or MCU to generate dial tones, reducing development time and software complexity. Reliable tone generation: produces 16 double tones for clear, predictable signaling from audio channel 1 or audio channel 2. Flexible power options: wide input range of 5 to 24 V DC lets you use common power supplies and battery systems without additional regulators. Dual simultaneous audio outputs: two 3.5 mm audio plugs allow the same tone output to feed two devices or channels at once, simplifying multi-point audio distribution. What it does and how it helps Function: converts keypad or MCU commands into 16 distinct double tones for dialing or signaling purposes. This offloads tone generation from your main controller and ensures consistent audio signaling. Compatibility: designed specifically for dial keypads and MCU interfaces; works with standard audio-equipped devices via 3.5 mm jacks. Performance: supports audio 1 or audio 2 as selectable sources to produce the required double tones, with stable operation across the specified DC supply range. Key attributes Electrical: wide operating voltage 5–24 V DC for flexible system integration. Audio outputs: two 3.5 mm audio connectors for simultaneous connection to speakers, recorders, or downstream audio circuitry. Interface: made for direct connection to keypads or MCUs to generate the 16 required double tones. Physical/material: module format with integrated audio jacks for straightforward wiring (refer to the product datasheet for exact dimensions and enclosure options). Practical use scenarios Embedded telephony or IVR prototypes: add reliable dial-tone generation to development boards and keypad-driven interfaces without implementing tone synthesis in firmware. Access control and intercom systems: generate dialing or signaling tones for remote door entry panels or local intercom stations, with one module feeding two downstream devices. Test and calibration rigs: provide consistent dual-tone signals to audio equipment or signal-processing systems for functional testing and validation. Integration notes Power the module with any stable 5–24 V DC source. Connect the keypad or MCU interface as specified by your system wiring, and use the 3.5 mm jacks to route audio to target devices. Consult the product datasheet or wiring diagram for pinout and recommended connection details.