Shared Projects

Fire Fly’s 2.0 with ATtiny10

USB power supply module

Project by Sean Scanlan

Project by Sean Scanlan

ESPHome-based 3D printer filament dehumidifier

Board to adapt TO252-3 transistors to 0.1" pitch through-hole. I used them to replace transistors in a circa-1990 NAD 5000 CD player (Q101-Q109). The original transistors (Qodd: 2SB1237 PNP / Qeven: 2SD1858 NPN) are obsolete Rohm Semiconductor parts and I couldn’t find good replacements in a through-hole package. Instead, I replaced then with onsemi 2SB1215 PNP and 2SD1815 NPN which are parametrically similar, handle more power and are still active and available.

The centers of the three through-holes in this board are spaced 0.158" from the bottom edge of the board for this Sullins right-angle header (holes are purposely tight; wiggle the connector pins and they’ll go through). The large TO252-3 pad (collector) is surrounded by thermal vias and both sides of the board are copper floods connected to the collector. Suggest ordering 2oz copper to maximize heat transfer to the board.

A pair of boards (“Balancer” and “Unbalancer”) which convert unbalanced and balanced audio signals back and forth.

BOM

Contact me if there are questions.

One application would be a frontend to a function generator which itself is single ended. Together with the “Balancer” board, that function generator would give a balanced output. When equipped with AD8033 and AD8034 OpAmps from Anolog Devices, the boards can be driven with 5V - 24V (center pin positive), so line level audio signals are easily produced.

The boards have the following input and output terminals:

• A common BNC connector
• Balanced XLR panel mount receptacles from the Neutrik D series, NC3MD-H (male) and NC3FD-H (female)
• Unbalanced TS mono jacks from Marshall, MESKTP00005

Schematics:

3D Model:

This is a simple board to give left stick priority for elevator trim activation in Experimental category light aircraft.

This PCB fits between the solder cups of D-sub connector J1 and is soldered to the connector’s cups. The assembled module fits inside the connector backshell listed in the bill of materials.

All trim switches must pull this board’s inputs to ground. Both outputs from this board pull to ground. Do not connect the outputs directly to a trim motor; the module is intended to provide “up” and “down” signals to an elevator trim controller such as a TCW Technologies Safety-Trim unit or a relay deck.

Connect +12V, trim switches and trim controller to this module using a female 9-pin D-Sub receptacle and appropriate sockets. If a center trim switch is not installed, do not populate pins 3 and 7 of the mating receptacle (the center trim switch is provisioned to accommodate aircraft like the Kitfox, which is designed to have a single trim rocker switch on the center console; adding stick switches results in three sets of switch contacts).

This project is intended for use in Experimental category aircraft only. Do NOT install it in a CAR Part 3 or FAR Part 23 certificated aircraft without FAA Field Approval.

SCHEMATIC & WIRING DIAGRAM: Download here.

BILL OF MATERIALS (Digi-Key): https://www.digikey.com/en/mylists/list/MWE6AGTBZJ

This is a board for the OBEGRÄNSAD hack project found here: https://github.com/ph1p/ikea-led-obegraensad

The goal is to make the wiring easy, to add I2C, and Microphone

v1

Power converter that takes 10V to 28V in and puts out 3.3V. V1 Errata: * LDO footprint is incorrect, but can be bodged to work

Power converter that takes 8.1V to 28V in and puts out 5V and 3.3V. This design has not yet been tested.

Adapter board to connect an FTDI UM232H module to a WebFPGA ShastaPlus board.

This allows the Lattice iCE40UP5K FPGA to communicate with a host computer via any of the modes supported by the FT232H, including synchronous 245 FIFO (up to 40Mbytes/s).

Series resistors are provided on each connection to protect the I/O ports of both devices.

A 14-pin expansion connector is also provided for spare FPGA pins.