KW38 +20dBm Extended Range Reference Design Board

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5G

2019 Electronic Competition Question E-Internet-based signal transmission system (Xidian University)

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2021 Undergraduate Electronic Design Competition Title E National Second Grade Work (Digital and Analog Signal Mixed Transmission Transceiver)

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WS281x LED RS485 transceiver

2 Layers PCB 10 x 18 mm FR-4, 1 mm, 1, HASL with lead, White Solder Mask, Black silkscreen;Cofigurable RS485 TX-RX transceiver for long range serial LED strip communication

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10.5GHz (X-band) patch antenna

4 Layers PCB 60 x 171 mm FR-4, 1.6 mm, 1, HASL lead free, Green Solder Mask, White silkscreen;10.5GHz, 8 element, patch antenna. Make your own phased array for communications or radar. Full instructions at github .com/jonkraft

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PicoCray: 9 Raspberry Pi pico RP2040 for parallel computing

The PicoCray project connects multiple Raspberry Pi Pico microcontroller modules into a parallel architecture, utilizing the I2C bus to communicate between nodes

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1.6kW 48V output telecommunications equipment power supply

This reference design provides design guidance, data and other content for a 1.6kW 48V output power supply using semi-bridgeless PFC and isolated phase-shifted full-bridge DC-DC converters.

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1kW Full-Bridge DC-DC Converter

This reference design provides design guidelines, data, and more for a 1kW server power supply using a phase-shifted full-bridge DC-DC converter.

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500W server power supply using TOLL package DTMOS

This reference design provides design guidelines, data, and other content for a 500W server power supply using continuous current mode PFC and LLC DC-DC converter. Using TOLL packaged MOSFETs in the PFC circuit reduces the overall size and increases power density.

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555 timer: 4MHz (80 meter band) CW transmitter

Might not be an actual working transmitter, but it does produce a few mW of RF power at 4 MHz using only two LMC555s.
Principle of Operation (see attached simplified schematic):
At lower operating voltages, the flip-flop (TR) input of the LMC555 can be used as an inverting comparator input to control the output of the device. This requires the Threshold (TH) input to be active (high). This circuit applies a DC bias at the switching threshold of TR and superimposes a small AC feedback signal to create an oscillator. An inverted version of the same signal is applied to the second LMC555 to produce two complementary open collector outputs (the device's discharge output). The output is then connected as a standard push-pull RF amplifier. The TH input is used as the enable input to key the transmitter.

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Cat.1 DTU extended version

Introduction: With 485 interface, Quectel EC600N-CN module is used as the communication module, and a 20pin custom interface is reserved.

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[Internet of Things] Hongmeng Smart WIFI Switch +4212619A

Introduction: Based on HiSilicon Hi3861 chip, intelligent WIFI switch

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[Solicitation Order] One-way relay switch

Introduction: A relay switch based on ESP8266, used with the HASS open source smart home platform, and communicates through MQTT.

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410_UFI_HUB

Introduction: The expansion board for 410 UFI uses SL2.1A as the Hub master

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SIM card adapter board

Introduction: eSim to SIM

nanoSim to SIM

eSim/nanoSim to SIM

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ADS-B 1090Mhz filter amplifier

Introduction: ADS-B 1090Mhz filter amplifier

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W806 IoT clock and temperature and humidity sensor

Introduction: This project uses W806 chip for development, adds a light sensing module, a temperature sensing module, leads out most of the pins, and adds WiFi8266 ​​as a network interface, which can expand the functions of the development board and truly realize the Internet of Things function.

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pico rocker chip

Introduction: Pico-based joystick chip

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FC red and white machine game flash card Mapper0

Introduction: For proofing thickness, you need to choose 1.2mm FC red and white machine game burning card Mapper0. The board is being printed and has not been verified yet. You need to cooperate with kazzo to burn the game.

Schematic PCB