RTL8111E+RTL8105E application reference schematic

Schematic PCB

residential gateway

handheld radio communicator

Industrial IoT Router

wireless backhaul

IoT gateway/communication center

KW38 +20dBm Extended Range Reference Design Board

Schematic PCB

5G

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

Schematic PCB

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

Schematic PCB

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

Schematic PCB

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

Schematic PCB

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.

Schematic PCB

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.

Schematic PCB

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.

Schematic PCB

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.

Schematic PCB

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

Introduction: Based on HiSilicon Hi3861 chip, intelligent WIFI switch

Schematic PCB

[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.

Schematic PCB

410_UFI_HUB

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

Schematic PCB

SIM card adapter board

Introduction: eSim to SIM

nanoSim to SIM

eSim/nanoSim to SIM

Schematic PCB