Shared Projects

GET THIS AS A FLEX PCB!

This is a board to help clean the 3 noisy power rails near the Game Boy Advance CPU. There is a guide for this but only covers 2 rails but it is a hard to do mod since the existing capacitors we solder onto are 0402 size which is real tiny.

Video Guide here: https://youtu.be/gOiidmRdIPA

Original Guide: https://support.retrosix.co.uk/support/solutions/articles/77000361029-removing-noise-from-gba-audio

The C1, C3, C5 capacitors are 10uf 6.3v 0805 size (get 10v version if you can)

The C2, C4, C6 capacitors are 1uf 6.3v 0805 size (get 10v version or higher if you can)

amplifies 4 raw signals coming out of XRM autotune revA for in-situ alignment purposes

Schematic: https://www.phys.hawaii.edu/~mza/PCB/XRM/zeist.revA.schematic.pdf

Replacement for wood desk clock

Breakout for nRF51822 (WT51822-S4AT module) sensor node

coax:diffpair interface via balun

use 2 oz copper, 0.8mm thickness

Schematic: https://www.phys.hawaii.edu/~mza/PCB/misc/balance-board.revA.schematic.pdf

FS5-15-04.0-L-DV-TH-K-TR breakout board

FS5-30-04.0-L-DV-TH-K-TR breakout board

ST Micro produced a great new chip! And then they packaged it inside a 9x9 0.5mm BGA… I tried to produce a PCB for it, but the limits were too great (tiny?) for OSHPark.

And then ST announced two more packages - and one wasn’t a BGA! It has fewer pins, and isn’t available yet, but this time I could stay within OSHPark’s parameters.

This board gives a breakout for all the GPIO pins (except see below), as well as components for all the special purpose sections. Note, however, the board has not been tested! I will be posting the schematic and BOM soon!

Features

Apart from the actual STM32WLE5C chip, this board has the following features:

• The board is tiny! It is designed to be used standalone, or as a module for a larger board (uploaded soon!).
• The antenna is attached via a U.FL connector.
• The 32 MHz TCXO and support components are included, and wired to PB0 (sorry, not available on a header).
• The PE4259 RF switch and RF signal path components are included.
• Both Low and High TX power paths are supported with solder jumpers JP1 and JP2 - one MUST be chosen and soldered before powering on!
• There’s an FTDI header (with extra pins for Battery), although it only supports 3v3 instead of 5v. Note that the linked device only supports 50mA, which is fine unless you’re using TX/PA High!
• The GPIO breakout is to 2× 17-pin 0.05" headers, for GPIOs and special pins:
  • Port A is on its own header, assigned to the correct pin numbers (starting at pin 0 ). There are also jumpers to connect to the FTDI RxD and TxD;
  • Ports B and C are on a second header, also assigned to the correct pin numbers - they coincidentally(?) interleave!
  • Special purpose pins are brought out, and are next to relevant pins for easy jumpering:
    • BOOT0 is next to GND (recommended) and 3v3 ;
    • Batt is available for the Real Time Clock;
    • NRST is available, and next to JTRST for jumpering if desired (not necessary);
    • VDDA is next to 3v3 , or can be connected to a separate supply if desired;
    • PC14 and PC15 are brought out directly - but have PTH footprints for a 32.768kHz crystal and capacitors if desired (note that the long trace lengths will affect the capacitance required);
    • AntSw CTRL for the PE4259 is available - connect to any GPIO.
  • JTAG / SWD is brought out to a CS10 CoreSight connector - SMD, PTH and Pogo footprints are overlaid. Thus the board can:
    • Be programmed standalone by Pogo;
    • Have an SMD or PTH connector soldered on for development work;
    • Be fitted to a larger breakout board, with (more usable) 0.1" headers and STLink serial programmer.

https://drive.google.com/file/d/1s302vvv1um1cYEb1dIAznU2ZQyoBu5ko/view?usp=sharing

Universal Mixer Board

NES Expansion board for Adding Expansion Audio to a Front Loader NES RGB Install. Search for these part numbers where ever you buy components.

R1 = CRCW08051K00FKEAC
R2 = CR0805-FX-4322ELF

See my github repo for more info: https://github.com/makhowastaken/12p-ffc/

propeller based VGA terminal with USB keyboard https://www.maccasoft.com/en/electronics/vga-serial-terminal/

A support for an ion trap for clouds or “whales” of laster cooled Sr+

Motor drivers for a star tracker with BT controls