Cette sirène deux‑tons… je l’ai faite avec un CD4093 !

Want to build a real two-tone siren with almost nothing? In this video, we transform a simple CD4093 into an expressive, clean, and perfectly controlled sound machine. We start with a circuit that beeps, we understand why… and we develop it until we achieve a WOO-WEE worthy of European sirens. On the agenda: • How Schmitt trigger NAND gates work • Creating three oscillators (low, high, slow) • Logic inversion to alternate tones • Audio mixing and transistor amplification • Tips for adjusting the frequency, speed, and character of the siren • Complete demonstration on a breadboard This is a simple, fun, and highly educational project, perfect for discovering CMOS oscillators and understanding how a logic circuit can become a sound instrument. If you'd like to see more little projects that sing, blink, or react… like, subscribe, and tell me in the comments which component you'd like to explore in the next video. Welcome to Protoelectronics. Here, we learn, we experiment… and we have fun. 🚀🔧🎧 00:00 Introduction 00:44 Project Overview 01:49 Project Functionality 03:35 Layout Diagram 05:48 Component List 06:39 Project Testing 07:43 Conclusion Script Link: https://docs.google.com/document/d/1G... Google Drive Folder Related to this Video: https://drive.google.com/drive/folder... Royalty-free music used in this video: Nico Staf - Fast and Run    • Nico Staf  | Fast and Run   Francis Preve - Stranger Danger    • Stranger Danger   Angel Lover - Eyes of Glory:    • Angel Lover - Eyes of Glory   Heaven and Hell - Jeremy Blake:    • Heaven and Hell - Jeremy Blake