1.6kW T-type three-level PFC power supply

This reference design provides design guidelines, data, and more for a 1.6kW AC-DC converter power supply using a T-type three-level power factor correction (PFC) circuit.

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Application circuit of low-power operational amplifier TC75S102F

Application circuit of low-power operational amplifier TC75S102F suitable for various sensors. These application circuits can be used in devices requiring long battery life, IoT sensors, energy harvesting systems, and more.

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Desktop pen holder and calendar made with raspberry pi pico

In theory, it could connect to Google Calendar and show today's events while still being ongoing. Also on the list of features to be implemented is a switch or sensor that changes mode when the pen is removed, and buttons or touch controls for the user interface.

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MiniQ: a mini quadcopter

MiniQ is a mini quadcopter that is open source from hardware design to control algorithm. The algorithm used for the Altitude Heading Reference System (AHRS) is the DCM complementary filter. The system calculates the height and controls the output PWM of the four motors 1600 times per second. It can be controlled remotely via Bluetooth (Bluetooth Serial Port Profile).

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SpaceX Starlink user terminal modification

Author Lennert Wouters demonstrated how to execute arbitrary code on Starlink user terminals via a custom modchip injected with voltage faults, and notified Starlink of these vulnerabilities.
Although the details are open source, the author does not sell the finished product, nor does he provide details of the modified endpoint firmware and fault injection used in the attack.
The transformation is to use a Raspberry Pi microcontroller

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Open source audio amplifier

The power supply has a stable symmetrical +/- 40 V to ensure optimal performance.
Maximum power (THD 1%) approaches 100 W into 8 Ω load and 190 W into 4 Ω load (see measurements). All parts are through-hole, making it easy to build the amplifier. The design is completely symmetrical.

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Automatic doorbell with object detection

Every house has a doorbell. When a visitor arrives at a home, he looks for the doorbell switch and rings it to let us know his presence. What if a person coming to your home cannot find the doorbell, or the person is too short to reach the doorbell? The object detection circuit installation below is for reference. The circuit will automatically sense the presence of a person and ring the doorbell.

Simple circuit to detect mobile phones

Cell phones typically send and receive signals in the frequency range 0.9 to 3GHz. This article provides a simple circuit that detects the presence of an activated mobile phone by detecting these signals.
The basic principle of the mobile phone detector circuit is to detect radio frequency signals. In Schottky diode circuits, Schottky semiconductors are used to detect mobile phone signals because of their unique properties of being able to correct low-frequency signals with low noise rates. When an inductor is placed near an RF signal source, it receives the signal through mutual inductance. This signal is rectified by a Schottky diode. This low-power signal can be amplified and used to power any indicator light, such as an LED in this case.

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Teacher ChaN’s headphone amplifier design

Teacher ChaN’s headphone amplifier design

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12f629 microcontroller decodes KEELOG source code, commonly used remote control rolling codes

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51+sl811 source program + schematic diagram for reading and writing U disk

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TEA1721 Universal Mains White Goods Flyback SMPS Demonstration Board

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LPCXpresso43S67 development board

The LPCXpresso family provides a powerful and flexible development system for NXP Cortex-M microcontrollers. The LPCXpresso43S67 board was developed by NXP to enable evaluation and prototyping of the LPC4300 series MCUs, featuring the LPC43S67 in a 100-pin BGA package. LPCXpresso™ is a low-cost development platform provided by NXP that supports NXP's Arm-based microcontrollers. The platform includes a simplified Eclipse-based IDE and low-cost target boards with a JTAG debugger. LPCXpresso is an end-to-end solution that supports embedded engineers developing applications from initial evaluation to final production.

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BGU7031 Evaluation Board for Set Top Box Low Noise Amplifier

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BGU7045 evaluation board for set-top box low noise amplifier with bypass function

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BGU7044 Evaluation Board for Set Top Box Low Noise Amplifier

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BGU7042 Evaluation Board for Set-Top Box Low Noise Amplifiers with Bypass

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BGU7033 evaluation board for set-top box low noise amplifier with programmable gain and bypass functionality

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BGU7032 evaluation board for set-top box low noise amplifier with bypass function

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LPC54114 Audio and Speech Recognition Kit

The LPC54114 Audio and Speech Recognition Kit provides developers with a complete hardware and software platform for evaluation and prototyping of the LPC54114 family of processors. Developed by NXP, this product gives you everything you need to develop low-power, always-on voice wake-up products. LPCXpresso™ is a low-cost development platform provided by NXP that supports NXP's Arm-based microcontrollers. The platform includes a simplified Eclipse-based IDE and low-cost target boards with a JTAG debugger. LPCXpresso is an end-to-end solution that supports embedded engineers through every step of application development, from initial evaluation to final production.

Schematic PCB