Shared Projects

https://github.com/Infinest/GENESIS2PCE

Balanced line driver based around THAT Corp 1646 or similar chip

Documentation: https://www.diyrecordingequipment.com/pages/balanced-input-output-assembly-guide

https://drive.google.com/file/d/1M4i6ef4WODtPkuXQxiPonWQ8hKF1Lv4i/view?usp=sharing

https://github.com/adlerweb/uPoff

Minimal board for DS2406 feat. pullups

Custom display using 4 8x8 38mm dot matrix panels.

https://github.com/erikvanzijst/dotmatrix

Breakout board for a combined Ethernet and USB jack. Details here: https://forum.pjrc.com/threads/61367-T4-1-ETH-USB-combo-breakout-testing

BOM: (sorry for crappy formatting, I can’t get MD to work for me)

Part Value Package Mouser DigiKey

C1 1nF 2KV C1206 791-1206B102M202CT 478-1206GC102MAT1ACT-ND

C2 100nF C0805 710-885012207072 399-1177-1-ND

C3 1 uF C1206 80-C1206C105M3R 1276-3086-1-ND

C4 100nF C0805 710-885012207072 399-1177-1-ND

C5 1 uF C1206 80-C1206C105M3R 1276-3086-1-ND

J1 0821-1X1T-36-F BEL MAGJACK 530-0821-1X1T-36-F 507-1424-ND Alternate MagJack/USB Combo - Abracon ARJE-0032

J2 2X3-2MM 2X3-2MM 855-M22-2020305 1849-1000-ND

R1 1M R0805 652-CMP0805-FX-1004L 311-1.00MCRCT-ND

0.1” Pin Headers  2.54mm pitch    varies  

Wheelwriter Typewriter Sniffer, allows listening or transmitting on the internal bus as well as pulling various signal lines low, to request bus, power-on-reset, etc.

https://github.com/RussellSenior/ww5teletype/tree/master/hardware/reverse-engr

This is a circuit board with all of the connections needed to form an OR gate. The transistors and their pins are labeled appropriately.

A circuit board with all the necessary connections needed to make an inverter, or NOT gate. The transistors and their pins are labeled appropriately.

A circuit board with all the connections necessary to make an AND gate. The transistors and their pins are labeled appropriately as Source (S), Drain (D), and Gate (G).

CS5490 Single-phase energy monitor breakout v0.2. This board has not yet been assembled and tested. Use at your own risk. Github

https://www.eevblog.com/forum/blog/eevblog-1144-padauk-programmer-reverse-engineering/msg3095602/#msg3095602

An updated version of the VirtualCable board, changing the difficult install method to one that is much simpler and more mechanically reliable, as well as adding ease-of-use and test point features.

Bluejay

Allows the use of Sega Genesis or 2600 controller to work on 5200

I took the cloned UNO R3 design from Shamduino, replaced the FTDI chip with CH340 chip. FDTI costs about $4.50 each from legit source, and fake FTDI may be cheaper but once before a driver update bricked fake chips. CH340 is cheaper and there’s no driver bricking but you may need to manually install the driver on Windows and Macintosh. I also tweaked a few things. You have a choice of CH340G (cheaper, requires 3 additional components) or CH340C (doesn’t required additional components but slightly more expensive).

Soldering CH340, the dual op amp, and one MOSFET is probably the hardest part of this board.

I kept most of the parts the same using larger SMD for easier soldering. Printable copy of part location map and BOM can be seen below: “A” on map denotes anode of diodes, observe polarity! Also watch for notches or pin 1 marker on the 3 ICs. Orient the polarized capacitor with the angled end matching silkscreen. Crystal oscillators, ceramic capacitors, and resistors are non polarized and can be installed any way without issues.

text based BOM:

*CH340G requires external oscillator and 2 capacitors. If you have CH340C instead, the oscillator and 2 capacitors marked C15, C16, and Q1 above can be omitted.

Audio Active low Pass Filter Sallen-Key WA7MLH