Shared Projects

I DO NOT KNOW WHAT I AM DOING USE AT YOUR OWN RISK

I made this to adapt the JTAG cable coming from my Altera USB Blaster clone to the programming header on my QMTECH Xilinx FPGA Artix7 Artix-7 XC7A100T DDR3 Core Board.

I use this through openFPGALoader to program the board.

This is just a straight mapping. It is a convenience item. I do not know electronics well enough to know if this is a good or bad idea. It is just something that has been working for me,

A low cost, low-part-count board that, together with the SeeedStudio XIAO C5 w/ WiFi, exposes the full capabilities of the ADS1299 up to 4 boards at 1000 sps.

This board shifts each of the 8 channels by 1, for use when calibrating Metric Halo Labs' modern interfaces. Requires two DB-25 cables. UNTESTED

Fanout from Analog Devices USBi, with Extended SPI Latch Signal Pinout connections, to five separate SPI Control Ports.

This is a breakout board that exposes all the pads of a XIAO RP2350 board. You can also attach a 2 pin JST connector for a battery.

I’ve successfully used a hot plate and solder paste to reflow bare PCBs onto this board. The through-holes are placed such that you can insert into a breadboard.

designed to use either a l7805 or lm4931 voltage regulator but may be used with other pin compatible regulators. only populate U1 OR U2! not both!

all resistors 10-22R~ all diodes 1n4148 or similar all capacitors 10-50uf~

3 pin header labelled R - G is used with a 2 pin jumper to switch between Reg and Gnd on the second highest rail.

the regulator, caps (C3,C4) and resistor (R3) can be omitted from assembly if the functionality is not desired. one could also simply solder the two pins used to select Gnd on the 3 pin R - G header together in this case to save the two components.

9pin to USB quadrature mouse adapter for Amiga/Atari ST. It allows you to certain USB mice and game controllers with your Amiga or Atari ST. Uses a CH554 chip.

USB to Atari ST Quadrature Mouse Adapter based upon JJ Michel open source firmware (https://github.com/jjmz/Atari-Quadrature-USB-Mouse-Adapter). This design is mainly THT with the exception of the CH554 SOIC-16 chip.

The CH554 is programmed by first solder bridging the BOOT pads, then plugging it into a computer’s USB port via a double USB-A cord, and then running the Windows WCHISPTool to download and flash the firmware. After successful programming, use copper desoldering braid to remove the boot bridging.

Also works quite well as an Atari 8-bit computer mouse.

Schematics and downloads will be made available at: https://ataribits.weebly.com/

Schematic and BOM at https://github.com/rvl-system/rvl-boards/tree/main/serial-adapter

A Fully-Configurable DCC Dual Power Breaker - providing protection for two power districts. The design uses an Arduino Nano to allow all operational parameters to be set easily.

Requires one SN74LS158DR and one SN74LS32 (both narrow-body), one 33 ohm 1206 resistor, one 40 pin strip of turned machined pin header strip, cut into two 20 pin strips, one single-pin horizontal header for RA8 (J2), and one 40 pin socket.

Socket the PIA chip (6520) and right row of ramchips. Run a wire between all pin-1 pins on the right row of ram sockets and attach header plug (Dupont connector) for RA8 connection on module. Install 256k ramchips in sockets. Install module underneath PIA and attach RA8 wire from RAM socket pin-1. That’s it.