This project was made by Victor Trucco, I'm only sharing it fore ease of access.

TK-Pie for Spectrum ZX 48k, a home computer from 1983, which is an edge connection add-on that enables you to connect your Spectrum to a modern HDMI TV/monitor.

You can find more building instructions on my blog:

https://8bithardware.wixsite.com/website/post/building-tk-pie-by-victor-trucco

BOM:

PCB, 1 piece, 2 layer pcb

-RaspberryPi Zero,1 piece, we used RaspberryPi Zero, other types can be used with slight software modification (recompile the source code for the desired model)

-CPLD, 1 piece, we used EPM240T100C5N

-ZX Spectrum connector, 1 piece, edge connector 28x2P (double sided) Pin pitch : 2.54x5.08mm, 0.1"x0.2", you have to make some modifications.

-RPI connector-for board, 1 piece, 2x20 Pin 40 Pin header female, pitch 2.54

-RPI connector-for PiZero, 1 piece, 2x20 Pin 40 Pin header male, pitch 2.54

-JTAG connector-for programmator, 1 piece, 2x5 DC3–10P (2x 5 pins),pitch 2.54

-R1-R30, 30 pieces, 330 Ohm SMD resistor, size 1206

-R31, 1 piece (OPTIONAL for version 1), 0 Ohm SMD resistor size 1206, you can just short the via with solder, not needed for 9V version

-C1-C7, C10-C12, 6 pieces, 100 nF capacitor 50V ceramic THT

-C8, C9,2 piece, 100 uF capacitor (10V or 16V)

-U2,1 piece, LM1117, 3.3V LDO regulator (SOP or SOT223–4)

-U3,1 piece, L7805C2T, 5V positive voltage regulator

-CPLD Programmer

-Mini HDMI(Type C) Male to HDMI(Type A) Female