This is an update to the board that allows easy access to the 4 wire (Kelvin) connection interface of the DE-5000 LCR meter. The prior board required direct soldering to the ENIG surface, which lead to re-soldering problems. This board adds isolated VIAs(two for each channel) along with a strip of GUARD along the bottom with it’s own VIAs. Eagle brd files available at https://github.com/gclarkii/DE-5000-LCR-Meter-4-wire-slot-interface

Shrink of pyroesp’s PS1 reset Mod board, which supports in-game reset function using a controller button combination.

Note: This version is deprecated, unless you really need a solution that wires directly to the mainboard. See the Github repository or my other shared projects for One-wire QSB solutions.

Kicad project for this board is available on Github. Microcontroller code, original PCB project, usage, installation and programming instructions on pyroesp’s github

Features

• Small form factor of 82mm x 42mm
• Uses ESP32-WROOM-32D module
• Uses 128x64 0.96" inch OLED module
• Uses DS3231 RTC with battery backup (CR2032) for timekeeping
• Powered by 3.7V 300 mAh LiPo battery
• Uses MCP73831 for charging LiPo battery
• Uses TPS63001 Buck Boost Converter IC for efficient 3.3V power supply, with input range from 1.8V - 5.5V
• Uses TPS22919 Load switch to control power to OLED and RTC chip
• Autoselect power source, i.e., battery or USB
• USB Type-C for charging only (no data pins connected)

Github Link: https://github.com/Open-Authenticator/hardware-design

Breakouts 8-SOIC, SOT-23-6 (also SOT-23-5) and TSSOP-8. You can maybe fit others on here (like SOT-353), but I didn’t check.

Inspired by this reddit post: https://www.reddit.com/r/electronics/comments/ktahpo/diy_smd_package_breakout/

A board to produce a custom flickering effect for the 1/144 Bandai Slave One engines.

The same circuit as my 1AA Joule Thief - just smaller.

https://github.com/therealdoctorprojector/SMD-Joule-Thief

Slight tidy-ups since original release

The Camputers Lynx was a Z80 based microcomputer from the early 1980s. This is a recreation of the joystick interface created using a schematic provided by Pete Todd.

Board for diagnostic light. See www.rv-project.com/repairs/fusepanel.php for project details and BoM.

DIP16-300 to QFN16-0.65

Buzzer Board for short detector. See www.rv-project.com/repairs/fusepanel.png for build details and Bill of Materials.

Veglia Tacho Conversion

http://www.dinoplex.org/tachoconversion/

This FrSky S.Port to UART adapter is a tiny (9x7.7mm) device that allows connecting the single wire, half-duplex inverted FrSky S.Port signal to a regular, non-inverted, two wire UART.

List of components required:

• 2 * 2N7002 MOSFET in SOT-23 package
• 2 * 4.7k SMD resistor in 0603 package
• 1 * 330R SMD resistor in 0603 package
• 2 * 1x3 right-angle 2.54mm header pins (optional)

Adapter board for Razar Automatic power switch. For details and BOM see: www.rv-project.com/projects/razar2.php

School Project – Logarithmic Conductivity Tester

1,2,3, or 4 LEDs light up if the conductivity between P1/P2 is greater than 1uS, 10uS, 100uS or 1mS, respectively.

Test conductivity of your skin, apples, rain-water etc. Due to the logarithmic feature a large range is covered. Each LED indicates 10-times better conductivity that it’s neighbour.

The downloadable file contains the complete KiCAD project.

User interface board for AR LLRF

Adapter board for Razar Automatic power switch. For details and BOM see: www.rv-project.com/projects/razar2.php