10kHZ-255MHz signal generator OLED LCD

Schematic PCB

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

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.

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Homemade flexible capacitive sensor

By CNC engraving a PCB in the following manner, the curved pad can perform capacitive sensing in 3 different directions and ultimately detect the 3D position of the finger.

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

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5509A recording schematic diagram

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.

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PCF2131/PCA2131 Arduino ^® Shield expansion board

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SD/SIM Level Converter Evaluation Board

Schematic PCB

PCF85063TP-ARD Evaluation Board

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PCA85263ATL-ARD Evaluation Board

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Evaluation Kit - 33905D3, 2nd Generation SBC with CAN and LIN

Schematic PCB

MC68HC908JW32 Evaluation Kit Hardware/Software Example

The KITUSBSPIEVME evaluation kit is an available hardware/software example that allows users to become familiar with the MC68HC908JW32 through practical applications, USB to SPI and USB to parallel converters. The main function of this demo board is to support a PC without a parallel port, which can communicate with other NXP evaluation boards through the USB port. USB ports are a standard feature on almost every new PC. The kit utilizes the MC68HC908JW32's built-in USB, SPI and parallel ports.

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CAN/LIN communication expansion board

DEVKIT-COMM is a hardware plug-in adapter board that supports 4 additional CAN and 6 additional LIN/SCI connections when plugged into an existing development kit

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PTN5150A-PTN36043 USB Type-C CC Logic Evaluation Kit

Schematic PCB

PTN5110 Type-C Demonstration Kit

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Automotive Ethernet 100BASE-T1 PHY Customer Evaluation Board

Schematic PCB

MC33664ATL Isolated Network High Speed ​​Transceiver Evaluation Board

Schematic PCB