New Build ZX Spectrum - Composite Video
For the composite video we are going to be using a piece from You Make Robots – https://www.youmakerobots.com/sinclair/75-zx-spectrum-composite-mod-for-16k-and-48k.html
You can also print blank PCBs to populate from https://www.pcbway.com/project/shareproject/Sinclair_Spectrum_Composite_Mod_PCB_for_Modulator_Can_Install_.html
The one thing to be wary of is that it needs to be soldered from the left and right holes onto the main PCB to correctly ground it. To do this we use a single header pin, put the shorter pin through the bottom, view the video above to see, and then solder it.
Once you have done both halves solder this to the board, and then patch wires to the MOD and 5V pads.