The IC ISD1820 is a remarkable integrated circuit designed for voice recording and playback, making it an excellent choice for creative DIY inventions. This IC allows users to record short voice messages, store them, and play them back at the push of a button — all without needing complex programming or external memory. It has become very popular among students, hobbyists, and inventors who want to add sound features to their electronic projects.
In this invention story, the goal is to create a DIY voice recording and playback device using the ISD1820 module. The setup is simple yet powerful. The circuit includes the ISD1820 voice recording module, a microphone (built into the module), a speaker, a power supply (3V–5V), and a few push buttons for control. The three main buttons — REC, PLAYE, and PLAYL — handle recording and playback functions. Pressing REC records a short message (up to 10 seconds), while PLAYE and PLAYL play the recorded message in two different modes (edge-triggered or level-triggered).
To make the project more advanced, you can connect the ISD1820 to a microcontroller such as Arduino. This allows automation — for example, playing a message when a sensor detects motion or pressing a button remotely. Some inventors use it in talking robots, greeting devices, or security alerts that play custom voice warnings.
This invention teaches important concepts about analog and digital signal processing, sound storage, and control systems. It also sparks creativity by showing how human voice can be integrated into machines and devices.
In conclusion, the ISD1820 voice recorder project is a perfect DIY invention that blends electronics with creativity. It’s simple to build, educational, and opens endless possibilities for interactive and talking electronic devices.
