Shared Projects

NOT TESTED - ORDER AT OWN RISK Intermediate board to allow a drop-in replacement of an improved RGB video encoder chip CXA1165 in typical applications such as megadrive/genesis, Amiga A600/A1200 models. the 16K needs to be a 1% tolerance (or accurately tested) resistor and Y/C connections are broken out for S-Video mods to be attached (extra 75R + 220uF RC components needed in line with each)

Legacy Driver Interface Unit (DIU) power connector for Ridelogic/Popufare bus fare system.

All files here are under a CC0/Public Domain license.

Legacy power connector for the driver interface unit (DIU).

All files here are under a CC0/Public Domain license.

This is an old version, the latest version is here: QGPIO

TRL Board v0.3 (PCB 1.6mm) 4 Layers OSHPark For more details see GitHub 4Layers_trl-board_v0_3

This board is based on Mario Hellmich’s design see https://www.mariohellmich.de/projects/trl-cal/trl-cal.html

TRL Calibration Board for evaluation of Southwest Microwave 1092-02A-5(up to 40 GHz) or BELFUSE / Cinch 142-0771-831(Up to 26.5GHz) or cheap SMA connectors. 50 Ohms Impedance matched with OSHPark 4Layers FR408-HR

It contains following features:

• A thru standard for TRL

• A 50 Ohms match standard

• A 25 Ohms mismatch standard for verification

• An open standard for verification

• A short standard, used as a reflect standard for TRL

• A line of 45 mm length (Called also “Line 76mm” to reflect total length), used as a line standard for TRL

• A series fixture for 0402 components

• A shunt fixture for 0402 components

The board is designed assuming the following parameters (based on OSH Park 4 Layers 190Tg FR408-HR specifications):

• Base Material / Board thickness: 1.6 mm (63 mil)

• Conductor Height 0.17mm FR408-HR

• Center Conductor Width: 0.36 mm (14.17 mil)

• Gap Width: 0.25 mm (9.84 mil)

• Permittivity: FR408-HR 3.66 (3.68 @2GHz)

• Loss Tangent: 0.0092 @2GHz

• Copper Weight: 1oz outer (35µm), 1/2oz inner (17.5µm)

• Trace surface: Cu + ENIG

• Impedance: 50 Ohms (+/-2 Ohms)

• PCB Finish: ENIG (Gold)

Business Card Sized Zilog Z80 Single Board Computer GitHub

Mega Drive to CPC 2 Player Adapter

BOM: Mouser

For further instructions please vistit circuit-board.de (German website).

This is a replacement flex cable for the Turbo Express and PC Engine GT flex cable that goes from the mainboard to the 8 pin DIN for the Tuner.

AIBSOPT motor control shield. Improved connection points for v1.2

A board for interfacing a bare chip or wafer dice with a card edge connector.

This board is untested. When it arrives and gets tested (and maybe when someone reminds me), I’ll replace this message.

power distribution board version 2.

For using Teensy 4.1’s Ethernet

1   Ethernet Magjack            Cetus J1B1211CCD, Digikey 1278-1052-ND
1   Capacitor, 0.1uF         Vishay K104K15X7RF5TL2, Digikey BC1084CT-ND
2   Header, 3x2, 2mm pitch      Digikey 1849-1000-ND
2   Socket, 3x2, 2mm pitch      Amphenol FCI 89361-706LF, Digikey 609-3139-ND
1   Ribbon Cable, 120mm      Digikey HF06S-5-ND

This board and the required parts are also available as a kit from PJRC (but with a green PCB - not glorious OSH Park purple of DIY builds)

https://www.pjrc.com/store/ethernet_kit.html

Takes a gate (10v-15v) and converts it to a Buchla-style pulse with a transient of the input voltage followed by a sustain with a voltage set by RV1.

TSL1401R-LF breakout board, narrow

https://drive.google.com/file/d/1OSwQ6lUrDPc83HERk8sExm0cPPtqaNjS/view?usp=sharing

psu to XT60 Adapter