Audio Electronics deals with the circuits that are designed for converting sound/pressure wave signals to electrical signals, or vise versa. These circuits are used to processes and manipulate audio signals to design different types of audio amplifiers, audio mixers, frequency controllers etc..
This section consists of a huge collection of audio circuits with schematics and detailed explanation, to help you build Audio projects and use them for your Audio designs.
Capturing HDMI video on a Raspberry Pi, for a PiKVM-style remote console, a stream box or a test rig, has long meant a TC358743 bridge board limited to 1080p at 30 to 60 frames per second. Engineer adouglass52 has released three open-hardware HDMI to MIPI CSI-2 boards built around the Rockchip RK628H that reach 4K30 and 1080p120 on a single 4-lane link, with drivers that run on standard…
Thousands of Lenovo ThinkSmart View displays were built for Microsoft Teams calls and are now turning up second-hand for very little money. They have no battery, decent microphones and a speaker, and they are designed to stay switched on. Reddit maker m_s_ik turned one into a dedicated Home Assistant voice assistant and wall panel by replacing Android with a minimal Debian and a single program…
Vision development boards are useful when an embedded project needs to combine image capture, local display, audio input, storage and wireless connectivity in a single platform. The ESP32-P4X-EYE takes this approach around the ESP32-P4, adding an ESP32-C6 wireless module, a 2MP MIPI-CSI camera, a 1.54-inch SPI LCD, a digital microphone, MicroSD storage, USB…
For nearly two decades, vintage Apple iPods have been dormant in desk drawers, victims of dead batteries, obsolete charging cables, and retired iTunes libraries. Now, a London-based hardware startup called Certain Things is changing the narrative with Sprout, an open-source replacement motherboard that drags early-2000s music players kicking and screaming into the modern wireless era. Rather…
Adding a speaker to an embedded project is not always as simple as connecting it directly to a microcontroller or single-board computer. Most audio sources provide a relatively low-level signal, while a speaker needs more power to produce useful sound output. This is where an audio amplifier becomes important. The PUI Audio AMP2X15 is designed to bridge this gap,…
Missing a visitor at the front door usually means missed package deliveries, keeping friends waiting outside, or missing unexpected guests. Standard doorbells only work if we happen to be sitting nearby and the chime is loud enough to hear. If we are stuck in a work meeting, listening to music with headphones, or away from home, it is easy to miss the ring, leaving…
In this project, we build a complete ESP32 GSM voice calling device using the GeoLinker GL868 board. The main idea of this project is very simple. When we press a push button connected to the ESP32 board, it will automatically call a fixed phone number. Also, if someone calls the SIM card inside the module, the call will be automatically attended, and we can talk…
Voice control technology has become an important part of modern human-machine interaction. It allows users to control electronic devices and systems using simple spoken commands instead of traditional input methods such as buttons, switches, or touch screens. This type of interaction makes devices easier to use, more accessible, and more convenient in many…
The maker, Alex from Hobby Built, created a really interesting smart bottle that goes far beyond just holding water. This bottle can play your favorite songs, charge your phone wirelessly, display customizable LED lighting, and even indicate the water level inside in real time. What makes it even more impressive is how thoughtfully the entire structure is designed. The outer body is built…
In this project, we upgraded LiteWing, an ESP32-based development drone by adding a lightweight Bluetooth speaker system to extend its capabilities beyond flight. By adding a simple Bluetooth audio setup, the drone can now deliver real-time announcements, voice messages, or music directly from the air without requiring any additional coding. The entire system works…
Text-to-Speech, or TTS, is a technology that converts written text into spoken audio. It is widely used in voice assistants, accessibility tools, alert systems, kiosks, and smart devices. Today, ESP32 Text to Speech using AI has become a common approach for adding voice output to small electronic projects. On computers and smartphones, TTS works smoothly because…
Shrinking consumer electronics to their practical limits is a recurring theme in the DIY hardware space, and a recent project from the YouTube channel Gadget Industry takes that idea to an impressive extreme. The build centers on a Bluetooth speaker so small it undercuts the size of a single AirPods earbud, yet still manages to function like a conventional portable speaker. At the core of the…
