Shared Projects

Container PCB

Payload PCB

CuriousMarc’s HP 09825-66552 Crowbar Circuit Reproduction.

Crowbar protection circuit for the HP 9825, 9835 calculator

https://www.curiousmarc.com/computing/hp-9825-scientific-computer#h.xrov16yr03br

Provides power and data connection from ASTRA ground station to a PC and DC Power Supply

Slight update to avoid ground loop

Power supply replacement for the Toshiba T1200 laptop computer. This is revision 1.0. It has been tested and working with basic functionality (the computer boots). KiCad files and some more details are on GitHub.

This is a Leveler Controller that will power and automatically and turn on/turn off a LogicBlue LevelMatePro, Rhino Storm LevelerPro, or Kohree RV Leveler. All of these levelers are bluetooth controlled, and they use 3V button cells for power. The Leveler Controller provides 3V power from the RV’s battery system to alleviate having to change out button cells frequently..

The MCS-3C Leveler Controller consists of a power supply, opto-isolated trigger circuit, and ATTiny85 microcontroller to control the behavior of the controller. Upon the receipt of a trigger signal, the controller will turn on the leveler in one of 5 different methods - set by a mode switch on the pcb.

Rev B cosmetic changes. Order 2 oz copper if you need the 1A version, or 1 oz if you need the 500mA version.

See www.rv-project.com/tips/level2.php for BoM and construction document.

https://www.openhardware.io/view/586/E73-2G4M04S-Breakout#tabs-design

A smol board to build a Joule Thief, using Maker Tape or wire battery leads.

modified fuzz rite

Breakout board for the ADS112C04IPWR ADC from TI.

Connect LIS2DW12 INT2, replace LDOs with 3V0 TPS7A0230PQD both powered by PWRIN.

BOM/Parts on Digikey:

• Microfit Connector
• Fuse Holder
• Fuse
• Terminal Block for VIN

20 channel DC filtering board

This file is outdated, contact Thomas Bennett for the updated file

Simple JTAG adapter, may work to connect ESP-PROG to a D1 Mini32 board.

(NOTE: YOU MUST VERIFY DESIGN YOURSELF BEFORE USE.)

Fits even with Ethernet Shield

Fits with TwilightLord’s ethernet shield. May also fit with other ethernet shields.

Normally-open solder jumper for 3v3

The ESP-PROG does not appear to require this to be connected. Check your debugger board to see if they require this (e.g., to detect which level signal to output).

JTAG header may be soldered on either top or bottom

Due to space constraints, the center two pins are shared, so only one JTAG header can be attached per board.

Used pins are marked with silkscreen

• Circle for the four JTAG signal pins: TDI, TDO, TCK, TMS
• Square for ground pins (note: only on bottom of board until v1.5)
• Dashed-circle for optional 3v3 pin

Other Parts (BOM)

A through-hole 1.27mm JTAG connector (keyed IDC box header) is the only non-obvious part. An example description might be CONN HEADER VERT 10POS 1.27MM or similar. Two examples:

• LCSC: Wcon 3130-10SG0BK00T1
• Digikey: CNC Tech 3220-10-0100-00

You likely also want standard 0.1" pins or sockets, to allow you to stack this board onto an existing ESP32 D1 Mini board. Specifics will vary by use case, so those 0.1" headers / sockets are not listed here.