Shared Projects

An ESP32 2.45 GHz 35-j10 to 50 Ohms L-pad.

For more details please refer to https://twitter.com/mishkathebear/status/1287179090236182537

For those wishing to build their own DIY TCB Gerald Rude created this shield intended to be used with a RobotDyn Mega 2560 Pro Arduino board. It is built almost entirely with through-hole components for ease of assembly and the few SMD components are easy to solder by hand.

When you flash the firmware to your Arduino, be sure to select the “TCB - DIY Version” firmware in OP Config.

• Discussion thread for DIY TCB designs
• Eagle Board and Schematic (zip)
• Printable Schematic (PDF)
• Bill of Materials (Excel)
• Board Assembly notes (PDF)

Am9511A APU Module - Designed for RC2014.

The RC2014 needs support or fast integer, long, floating point, and transcendental arithmetic. This Am9511A Module provides just that option to hand-off complicated mathematical calculations.

Made during the covid pandemic when I couldn’t get my hands on a console SCART cable or THS series RGB amp for a bypass.

IMGUR - Vajskids Consoles

Crisp and vibrant picture, plenty of room to adjust colour temperatures in the televisions OSD.

I haven’t got enough consoles to do thorough testing to determine whether my console is causing a mismatch between RGB channel outputs or if I have a dud amp on my prototype.

I have .7vpp on green and 1.3vpp on red and blue (all under load) with these same values on the board. This can be balanced by lowering the resistor value on top right of board for corresponding channels. In my case 20ohm resistor for R/B and 75 for G gave me a balanced .7vpp load across channels

I’d also recommend switching out the 7805 regulators for a pair of LM2940CT’s with a 63vdc low ESR cap across ground and outputs which fit easily under the board (absolutely necessary to step it down to 5v output) AND a new DC powerpack.

I’ve tried multiple and my favourite is a switchable 3v/4.5v/5v/6v/7.5v/9v/12v off eBay 2amp max draw. (Through polarity switcher as most are centre positive)

My external prototype with these regulators in the console along with the megadrive works as low as 6v but drops supply to the external amp (running from console regulator input pin to external case with its own external filtered 7805) to around 3.3v output thus dropping VPP on RGB channels to .4v and causing some haze.

Set this supply to 7.5v and you have a happy pair of regulators that won’t even warm the heatsink and one happy sega running perfectly at 5v. My vpp readings were taken @ around 4.75v input to the amp. Dark blues and colours made up of strong blue hues still showed some jail bars so I’ve had to cut track 50 next to the vdp. Lifting the corresponding leg at the CXA chip had no effect. Only Currently tested on a Megadrive one “HD graphics” PAL model Externally (@60hz)

Stay tuned :)

Amiga 2000 CPU Adapter V1

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Amiga 500 CPU Relocator V5

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License

Want to Support my work? Feel free to Donate!

Display driver board for the Korad KA3005P/KA3005D power supply. It can replace an original K002_V3.x board.

For more info check http://github.com/djedditt

https://github.com/74hc595/Amethyst

MIDI Female to Female adapter board with both DIN-5 MIDI and TRS MIDI. There are DPDT switches to choose either Type A or Type B TRS MIDI, as well as resistors and LEDs to indicate MIDI power and signal.

Save some cash, and save the environment, just solder two of these together after sanding and you have a full breakout board.