Dilshan R Jayakody’s Web Log

Simtelic Music Module is a user-programmable module that uses RTTTL data to store and play melodies. EL0003 - Programmable music module. RTTTL , which stands for Ring Tone Text Transfer Language , was created to provide a simple, text-based format for sharing ringtones on early mobile phones. Developed by Nokia , it quickly became popular due to its compact size and compatibility with text messaging services. This format allowed users to easily exchange custom melodies without needing specialized software or data connections. RTTTL is a human-readable data format where each ringtone is represented as a sequence of notes, durations, and optional settings. According to Simtelic naming conventions, this module is identified as EL0003 and is available for purchase online. Top view of the EL0003 module. This module is built around a 32-bit MCU, a 2Kbit EEPROM, and a CH340 USB bus conversion chip. It is compatible with the latest Windows and Linux-based PCs. The module is user-fr...

This project is about a wireless musical call bell, which I designed to meet some of my friend's requirements. This circuit design uses only the 4000 series CMOS logical ICs, NE555 , UM66 , and TDA7233 audio amplifier IC. For the remote control, we use a 433MHz 4-channel remote control module . This circuit is designed to work continuously with a low-power external 5V power supply. Prototype version of wireless call bell. The PCB in this call bell is designed as a single-sided PCB. The dimension of the PCB is 82mm × 50mm.  All the components in this circuit are commonly available through-hole-type components. The whole assembly process of this musical call bell is shown in the video attached to this document. The RF remote control module we use in this project consists of a remote control decoder and encoding IC. In our version, the transmitter (key fob) has a PT2262 encoder, and the receiver has a PT2272 decoder IC. In the prototype build, the receiver and transmitter are confi...