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

W84219ASJ75_lighting detector

2-layer PCB 38.7 x 49.5 mm FR-4, 1.6 mm, 1, with wire spray tin, red solder mask, white silkscreen; lightning detector.

Schematic PCB

kicad USB splitter: a three-way USB splitter for personal design and use

A simple USB switch so I can swap a keyboard or mouse between two computers.

It is operated by 4 single mechanical switches, 1 for each channel. Simple designs can be implemented.

Schematic PCB

110/220VAC optically isolated zero-crossing detector module for DIN rail bracket mounting with 3.3V or 5V output - ideal for Arduino, ESP32/ESP8266

Detects Zero Cross point of AC supply (110/220VAC) and outputs a 1ms square pulse at 3.3V or 5V. 72mm x 20mm for DIN rail carrier mount.

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

10kHZ-255MHz signal generator OLED LCD

Schematic PCB

Simple, high-quality condenser microphone DIY for under $100

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

Smart Gate Drive Coupler Evaluation Board

This reference design provides design guidelines, data, and more for the smart gate drive coupler evaluation board.

Schematic PCB

Low-cost 2.5KV USB power isolation solution (schematic + BOM + gerber, etc.)

This is a low-cost isolation achieved through a power transformer. Since the transformer is more convenient for AC isolation, but DC is not suitable, ATtiny412 is specially used for control.

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

Teacher ChaN’s headphone amplifier design

Teacher ChaN’s headphone amplifier design

Schematic PCB

FPGA-based Ethernet controller (MAC) source code

Schematic PCB

51 microcontroller TCP-IP+ protocol stack ZLIP source code

Realizing network communication using limited resources on 51 microcontroller platform

Schematic PCB

EtherCAT communication development platform based on ARM processor-schematic diagram

Schematic PCB

5509A recording schematic diagram

Schematic PCB

ZTE 2400-48V50A communication power supply schematic diagram

ZTE 2400 48v50a circuit schematic diagram, available for maintenance

Schematic PCB

Schematic diagram of RTL8306 switch

Schematic diagram and pcb of RTL8306 switch, where the schematic diagram is orcad and the pcb is ad10.

Schematic PCB