Shared Projects

UNTESTED, passive magnetic pickup/driver coil

Tauntek 8080ICE redesigned board with THT components.

Design is copyright R. Grieb / Tauntek. Permission has been obtained to replicate / distribute.

The KiCad schematic capture and board layout are my work.

Implementation of the Tauntek 8080 ICE with a socketed CPLD and THT components.

Original design is copyright R. Grieb / Tauntek. Permission has been obtained to replicate / distribute.

The KiCad schematic capture and board layout are my work.

version 0.2.1 Fixed the issue with the switch short circuit from v0.2

https://github.com/MiSTer-devel/Main_MiSTer/wiki/IO-Board-Assembly-(DIY)

Widened led trace.

XS SDRAM Board for MiSTer FPGA project

https://github.com/MiSTer-devel/Main_MiSTer/wiki/SDRAM-Board-Assembly-(DIY)

Adjustable square wave generator for my Oscilloscope

Keyboard and Display Using 2 X ATMega328p as per design by Grant Searle.

PCB for QX5252F Solar Light Controller

Rev. B here: https://oshpark.com/shared_projects/qyVkkKLJ

A RGB and audio amp for your PC Engine and friends (Core Grafx, Turbo Grafx and whatnot). Mega Drive 2 compatible video plug, RGB SCART cable should have 75Ohm resistors (and preferably also 220uF caps) which the cables should have already. Audio is also amplified a little to get higher volume, as it is a bit low from the expansion port.

• U1 3x23 Pin 2.54mm pitch header. Samtec SSQ-123-02-T-T-RA, SSW-123-02-T-T-RA (or -F-T-RA versions). As such only the left 2x3 pins and the right 3x3 pins are connected, thus any combination of plugs that covers those are adequate. 3xSSW-102-02-T-T-RA should thus also be good, or 2xSSW-103-02-T-T-RA. Note that Samtecs portfolio is huge, and there are many combinations of plugs that will work as long as they have 2.54 mm/0.100" pitch, are triple row and right angle.
• U3 MINI-DIN-9PIN (I used MDC-209 from tme.eu, but MD-90S from Mouser should be just as good)
• C1,C2,C3,C4 0.1uF 0805 MLCC SMD capacitor
• J1 1x02 Pin 2.54mm pitch connector (not necessary if you dont wanna disable the filter)
• R1,R3,R4,R5,R6,R11,R12 10K 0805 SMD resistor
• U2 THS7374 video amp
• C6,C7 2.2uF 0805 MLCC SMD capacitor
• C10,C11 1uF 0805 MLCC SMD capacitor
• R7,R8 1M 0805 SMD resistor
• R9,R10 2K7 0805 SMD resistor
• U4 TS922A opamp SOIC-8
• C5 10uF 0805 MLCC SMD capacitor
• C8,C9 10nF Film capacitor THT L7.2mm, W2.5mm, P5.00mm
• C12,C13 10uF electrolytic SMD capacitor 5x5.3
• R2 75R 0805 SMD resistor

Capacitors should be rated for 16V or higher (lower should also work, no voltages should exceed the 5V).

I recommend to 3D print one of these brackets to provide a mechanical stabilization of the card when used in PC Engine or Core Grafx: https://www.thingiverse.com/thing:3245238 I don’t have a TG16 to measure the port and make a similar for that.

An L293D based simple motor controller board for the Wemos D1 Mini.

Note: There is no reverse-polarity protection on this board. Make sure you wire the power in the right way! Note: The silkscreen shows ‘L298D’ wheareas the chip to be used is a ‘L293D’

More information and BOM can be found here: https://averagemaker.com/2018/09/wemoto-wemos-motor-controller.html

RX POE board

The PCB offers the option to connect a consolized NeoGeo MVS with impedance matching RGB and Sync signals to a regular TV.

If the CMVS is connected to a TV by using a SCART cable (e.g.) no additonal parts (capacitors, resistors) are needed inside the SCART plug.

If the 5V output of the PCB is connected to SCART pin 16 (RGB switching) an additional 180 ohm resitor is needed.

Jumper J1: The THS7374 has four SD-video filters (used for /CSYNC, R, G and B).

All four filters can be bypassed by using jumper J1. close J1: internal filters are NOT bypassed leave J1 open: internal filters are bypassed

It is not possible to set the four SD-video (THS7374) low pass filters individually!

Normally, you don’t need a LPF inside your MVS output. There are just a few capture cards out there who don’t have a anti aliasing filter for is ADC inputs. There you have to have the LPF turned on.

On analog devices a LPF is not needed. On professional upscaling solutions like the Framemeister and OSSC you have an anti aliasing filter prior to its ADC circuits. This means you can leave the filters of the THS7374 off, too.

The picture looks great! :)