DTMF wireless paging system circuit diagram
The described circuit operates by generating DTMF tones through the UM97085 encoder, which produces a specific frequency pair corresponding to the keys pressed on a keypad. These tones are then used to modulate a carrier frequency, allowing for efficient transmission over radio frequencies. The YN9101 decoder receives these modulated signals and demodulates them back into the original DTMF tones, enabling the system to identify the key presses accurately.
The design of the system emphasizes simplicity and cost-efficiency, making it ideal for small-scale applications such as internal paging in offices or warehouses. The use of integrated circuits minimizes the need for extensive external components, which further reduces the overall size and complexity of the system.
In terms of implementation, the circuit requires a power supply suitable for the UM97085 and YN9101 ICs, typically in the range of 5V to 12V. The encoder will be connected to a keypad, while the decoder can be linked to a simple speaker or alert system to provide audible notifications. Antennas for both the transmitter and receiver should be selected based on the desired range of operation, with considerations for frequency bands that comply with local regulations for unlicensed transmission.
Overall, this DTMF-encoded paging system presents an effective solution for wireless communication needs, leveraging established technology for reliable performance in various environments.IT usesDTMF encoder output dual tone multi-frequency coded signal to modulate the transmitted carrier frequency. It can form a DTMF encoded radio paging system. The circuit uses DTMF encoding UM97085 and decoding circuit YN9101 circuit to form a small wireless paging system for small internal paging.
It is convenient and economical. It is shown in the figu.. 🔗 External reference
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