This is version 1.1 USB-A of the FelinæPurr.

FelinæPurr (you can also write it FelinaePurr if your keyboard does not allow you to make that nice character) is a COMLynx compatible device. The COMLynx is the name of the Atari Lynx cable to connect two Lynx together. As the Lynx use RS232 protocol for that connector, it’s also the name of devices that allow to connect your Lynx with your computer.

This is an OSHW project, and more information can be found on the github page: https://github.com/986-Studio/FelinaePurr

8 channel ICP signal conditioner

A low voltage (12v DC) all-tube (12DS7) headphone amp described by Ron Quan and laid out (and enhanced a bit) by Mark Smith, @SmittyHalibut.

There was a category of vacuum tubes called “space charge tubes” which were designed to provide usable power at 12v DC for use in automobiles. The 12DS7 is one such type of tube, another common one being the 12K5 (*).

This design is an all-tube (no “hybrid” FET after the tube, as is common) using these unique space-charge tubes, headphone amplifier that provides useful power into at least 50 ohms impedance (the higher the better) requiring no high voltage as is usually needed for power tubes.

Components are as marked on the board. Use good quality 1% resistors, more for matching between left and right than because of the precise values.

The four 1uF caps that have “3 pins.” Those are just flexible outlines, so you can use 2.5mm or 5.0mm pin spacing on the 1uF caps. The square pad is always used, the two round pads are tied together.

The 12DS7 tubes can be found in a variety of places for about $5 each, such as: Tube Depot, or The Tube Store, or search on eBay for “12DS7 Tube.”

The volume pot can be any of: - Alps RK27 “Blue Velvet” audiophile pots. - Alps RK097 “Green Blob” cheap-but-still-pretty-good pots. - Any of the common .2" spaced dual-gang cheap pots. Luckily, there are good, inexpensive stepped attenuators in the same form factor.

Headphone connector is a Neutrik NRJ6HF.

The PopStopper components are the same as on my PopStopper page : Relay, and TL7700. (And I’m just now noticing that I screwed up on the IC outline on this board too. You’ll have to fold the pins under the TL7700 to make it fit on this outline. Sorry about that.)

(*) Note that the 12K5 is NOT a plug-in replacement for the 12DS7, but it should be a very similar ELECTRICAL replacement. So if you decide to use a 12K5 or similar instead of the 12DS7, you’ll need to wire it differently into the tube socket on the board. But no other modifications should be necessary.

Enigma Machine Charlieplexed External Lamp Field

https://github.com/arduinoenigma/USBHostExternalLampField

http://arduinoenigma.blogspot.com

Mega Shield

TL866CS/A PROGRAMMER EEPROM 16BIT ADAPTER 27C4096 TO 27C160/800/400

Battery voltage microOSD

Very small and simple Battery voltage OSD.

It supports 1S-4S battery. Supply voltage of OSD is 3.3-5.5v

More info here: https://github.com/nppc/B-uOSD

PCB for Persistence of vision Project on youtube.

Excelitas' CaliPile thermopile IR sensor with built in presence and motion detection algorithms as well as temperature. Ultra low power.

Power Distribution Unit for https://www.thingiverse.com/thing:2463154

Parts:

1 x https://www.sparkfun.com/products/8432

5 x https://www.sparkfun.com/products/119

Tiny chicklet to connect 9mm Alpha pots to breadboards.

This is the board for the DEF CON 25 Darknet Badge

Info on assembly here: https://github.com/thedarknet/defcon25-badge

LCD, Arduino Nano, Si5351A Frequency Synthesizer

Breakout for PixArt Imaging’s PMW3901MB optical motion tracking chip for use as a UAV positioning sensor.

MSX break board slim