This is a high-performance, adjustable constant current, and PWM dimmer project. It provides accurate output constant current and PWM control. The circuit regulates the current flowing through a LED/LED array to maintain the desired level of light output. The board consists of CAT4101 LED driver chip and LTC6992-1 PWM generator chip.
12W Constant-Current LED Driver with PWM Dimming – 12V DC@1A Input – [Link]
MEMS Microphones is setting a new performance benchmark across a growing number of industries. These innovative silicon microphones were designed to extend the benefits of the lowest possible self-noise (high SNR) and lowest distortion to an ever-expanding number of applications. The project presented here is a low noise analog MEMS microphone Preamplifier with compression and noise gating. The project provides a studio-quality audio experience. The project is built using SSM2167 chip and InvenSense ICS-40180 Low-Noise Microphone with bottom port and analog output.
MEMS Microphone Pre-Amplifier with Compression and Noise Gating – Studio Quality Microphone Pre-Amplifier – [Link]
This project provides AC voltage zero-cross timing detection and a DC voltage after diode rectification with high accuracy. Possible applications for such circuits are AC motor controllers, AC lamp controllers, AC Dimmer Controllers, Home Appliances. The circuit outputs a zero-cross signal from 90 Vac to 264 Vac input. The project is based on BM1Z102FJ chip which outputs a high precision zero-cross timing of targeted AC voltage and a DC voltage after diode rectification of high accuracy. The project also includes high voltage offline AC to DC converter chip BM2P129TF.
AC Voltage Zero Cross Detector – [Link]
This is a dual-supply precision full-wave rectifier board that can turn alternating current (AC) signals into single polarity signals. The OPAMPs, U1A, and U1B, buffer the input signal and compensate for the voltage drops across D1 and D2 allowing for small signal inputs. This implementation functions with limited distortion for 20Vpp input signals at frequencies up to 50 kHz and for signals as small as 50 mVpp at frequencies up to 1kHz. The circuit can be used in applications that need to quantify the absolute value of input signals which have both positive and negative polarities.
Precision Full-Wave Rectifier – Dual-Supply – [Link]
The BD9F500QUZ from ROHM Semiconductor is a DC to DC Converter with Input Voltage 4.5 to 36 V, Output Voltage 1 0.6 to 14 V, Output Current 1 0 to 5000 mA, Storage Temperature -55 to 150 °C. Tags: Surface Mount, Buck/Step down. More details for BD9F500QUZ can be seen below.
ROHM Semiconductor BD9F500QUZ Nano Pulse Control™ Synchronous Buck DC-DC Converter features built-in low on-resistance power MOSFETs. The BD9F500QUZ DC-DC Converter offers a current of up to 5A and a fast transient response due to the Constant On-Time control system. Additionally, the Light Load Mode control improves efficiency in light-load conditions.
The ROHM BD9F500QUZ Synchronous Buck DC-DC Converter is ideal for reducing the standby power consumption of equipment. The system can control sequence via the Power Good function. The BD9F500QUZ achieves high power density and provides a small footprint on the PCB, all in a small package.
more information: https://www.rohm.com/products/power-management/switching-regulators/integrated-fet/buck-converters-synchronous/bd9f500quz-product
DA4100 is a highly integrated System-on-Chip WattUp RF-transmitter IC designed to provide optimal charging of WattUp receiver devices. It forms the core of the Near Field WattUp transmitter system and is designed to charge a range of devices fitted with WattUp receivers. It features the RF transmitter, power management and integrated DC-DC supply, delivering a complete WattUp transmitter system solution. Applications include the wireless charging of low-power, battery-powered devices, such as wearables, fitness trackers, hearables, hearing aids, Bluetooth® trackers, smart pens and other devices.
more information: https://www.dialog-semiconductor.com/products/wireless-charging/da4100
LFPAK56D half-bridge – 60% lower parasitic inductance and improved thermal performance
A series of half-bridge (high side & low side) MOSFETs constructed in the space-saving LFPAK56D package format. Occupying 30% lower PCB area compared to dual MOSFETs for 3 phase motor control topologies due to the removal of PCB tracks whilst permitting simple automated optical inspection (AOI) during production. The LFPAK56D half-bridge utilizes existing high volume LFPAK56D assembly processes, with proven automotive reliability. The package format uses flexible leads to improve overall reliability, and an internal copper clip connection between the MOSFETs simplifies PCB designs and brings a plug-and-play style solution with exceptional current handling capability.
more information: https://www.nexperia.com/packages/SOT1205.html
Texas Instruments TPS562211 2A Synchronous Buck Converter is a flexible, cost-effective solution in a SOT583 package. The TPS562211 Converter features a selectable Eco-mode operation or FCCM (Force Continuous Conduction Mode) operation. Furthermore, a selectable Power-Good indicator or external soft-start is also configurable through the MODE pin. The TPS562211 allows power sequencing by configuring Enable, Power-Good indicator, or external soft-start correctly. A 4.2V to 18V wide input voltage range supports a wide variety of common input rails, such as 12V and 15V. The device supports up to 2A continuous output current at output voltages between 0.6V and 7V.
The TI TPS562211 2A Synchronous Buck Converter implements a fast transient response with true fixed switching frequency using the Advanced Emulated Current Mode (AECM) control topology. Facilitating an internal smart loop bandwidth control, the TPS562211 provides a fast transient response over a wide output voltage range without the need for external compensation.
A cycle-by-cycle current limit on the high-side peak current protects the Converter in overload situations. This feature is enhanced by a low-side valley current limit, which prevents current runaway. Hiccup mode is triggered under overvoltage protection (OVP), undervoltage protection (UVP), UVLO protection, and thermal shutdown.
The TPS562211 2A Synchronous Buck Converter is housed in a 1.6mm × 2.1mm SOT583 package.
more information: https://www.ti.com/product/TPS562211
Stereo finds widespread applications in audio media production owing to the growing demand for portable consumer electronics and listening systems like PA systems and sound boxes supporting impression and sonics of natural hearing. Form factor requirement of the new maker and DIY boards and means reduced hardwiring and system components. The Wave III – 2 channel stereo audio player/recorder module manufactured by Senior Electron LLC is built to meet these specification requirements.
The module is furnished with FAT file system support which makes it compatible with multi-alarm voices, music players, and audio recorder applications. Its FAT file system allows users to play or create a file to record by calling file names using AT – commands. The wave III can record audio files on micro-SD and play pre-loaded files with 2 channel stereo of 10 – bits resolution.
It is equipped with an auto-baud rate detection system to automatically detect, adjust and assign baud rates up to 256 kbps for UART serial port communication. The module supports a standard serial RX/TX port for interfacing with devices like Arduino, Raspberry Pi, and microcontrollers. As a plus, it requires just a few plugs; power, audio in, and audio out to reduce overall system components.
From PCB reads, the board has 1 audio in and 1 audio out, which can only suggest that it runs a pseudo-stereo protocol. And that means it will not only offer reduced internal/control system components requirements but reduced external inputs peripherals too: only one microphone and one speaker is required for its 2-channel audio play/record function. This design also means that users don’t have to go through the headache of setting two microphones/speakers at orientations that will support sound localization of human perception. It’s just a plug-and-use architecture, a reason it should be the maker’s favorite.
Wave III also supports low latency commands allowing for playing multiple audio files without interruption, super high audio quality, and 8bit/16bit Wav audio formats. Its footprint, sample code, and documentation are available for Altium designers and Devkit solutions/users just to make using it a hitch-free task. The Devkit board has an in-built USB to UART FTDI chip, an audio I/O jack, and jumpers giving makers, DIYs, and hobbyists the flexibility of testing for suitable settings and functionalities. That’s a big plus too. Its sample code is fully written in C language and is compatible with Arduino and any other programmable devices and chips.
As at the time of this writing, the wave III with the manufacturer’s part name, Wave-3-RV2.0 is only available for an active funding campaign on GroupGets at a single-unit price of $25.00 and $65.00 for the Dev Kit, which the company says will help users to start working with the module straight up without having to design their own board.
“The Dev board has a USB to Uart FTDI chip on board, Audio input and output jack, and jumpers to try different settings. With this board, you can just easily plug a speaker or headphone to it and use a terminal to send commands to the module to play/record and try its different functionalities.”
Manufacturing will commence once the required target is reached according to the designer. Its campaign is scheduled to end on Sat, 06 Nov 2021, according to GroupGets.
To join the funding campaign, and get more information on Wave-3-RV2.0, visit GroupGets.
Knowles, has launched a development kit for the Raspberry Pi for prototyping products based on a homegrown AISonic IA8201 DSP that was introduced not long ago.
Designed to bring voice, audio edge processing, and machine learning (ML) listening capabilities to various systems, the devkit supports wake-on-voice processing for low latency voice UI, noise reduction, context awareness, and accelerated machine learning inferencing. It also supports
“high bandwidth processing of advanced, always-on contextually aware ML use-cases and memory for multiple algorithms,” says the company,
and offers a choice of 2 mic array boards with 2x or 3x mics respectively. There’s also an adapter board with three buttons connecting to the Raspberry Pi, as well as the DSP board itself connected via a flat cable to a microphone array.
Software support for the IA8201 SDK includes Amazon Alexa, Sensory, Retune, and Alango voice services. It also supports TensorFlow Lite Micro SDK for AI/ML applications. Configuration tools, firmware, algorithms, and other product briefs can all be accessed via the company’s Solutions Portal.
The Knowles’ AISonic IA8201 OpenDSP is aimed at lower-power AI processing. It features a Cortex-M4 chip along with 2x Tensilica-based, audio-centric DSP cores: a DeltaMax” Xtensa LX5 128-bit 4-way floating-point SIMD DSP core optimized for frame-based audio processing and DNN acceleration, and, a “HemiDelta” Xtensa LX5 64-bit 2-way floating-point SMID DSP core optimized for low power, always-on processing of sensor inputs.
Other features and specifications of the AISonic IA8201 DSP include:
Usage for both the kit and the DSP includes smart home and building voice hubs applications, home entertainment systems, proximity detection systems, wireless earbuds, and inference engines for many industrial and commercial applications. You can also use it for security systems that detect glass breakage and for smoke alarms too.
The kit appears to be available for order but you may have to reach out to the company to get one as it is not being sold online. Other useful details on both the devkit and the IA8201 DSP can be found on the kit product page and datasheet respectively.
login
