WHOOPS ! (oh not not him again)

[dublevay]

Oh, Rolf, if you could take a picture of the solder side with a bright light shining at the component side (with the components removed), I think we would be able to see most connections.

Don't hate me

Thanks, but I've got the underside done correctly. It's the remaining silver tracks on the component side that are stumping me, though you clearly have better eyesight than me on some of these links. I just could not see the link between the transistors.

JCB_Speech_Synthesis_Module_PCB_Bottom.jpg (577.75 KiB) Viewed 42744 times

[robcfg]

Let's see if this helps

Green is component side and orange is the solder side.

Notice that there are a couple of links missing because of the sockets.

[dublevay]

Thanks - that may help a lot. I'll take a look tomorrow.

JCB_SS.jpg (105.54 KiB) Viewed 42737 times

[robcfg]

Oooooh, looking good!

Tell me if you need the file with all the layers.

[dublevay]

Right - I think I've done it finally.

Board.png (61.6 KiB) Viewed 42712 times

Schematic_complete.png (60.28 KiB) Viewed 42712 times

JCB_SS.jpg (725.24 KiB) Viewed 42712 times

[dublevay]

I may replace the 2732 layout with a 2764-27512 one, to make sourcing EPROMs easier.

[robcfg]

That is one nice looking board!

I think using 2764-27512 is a good idea, and I'd like to expand on that by asking if it would be possible to include the 28/29F010/20 as they have basically the same pins as the 27512 save for the Vcc and the 4 extra pins.

I think they would be even easier to find (I have several from old PC motherboards) and we get one more option to source chips.

[dublevay]

That is one nice looking board!

I think using 2764-27512 is a good idea, and I'd like to expand on that by asking if it would be possible to include the 28/29F010/20 as they have basically the same pins as the 27512 save for the Vcc and the 4 extra pins.

I think they would be even easier to find (I have several from old PC motherboards) and we get one more option to source chips.

I'll give it some thought - depends what I can squeeze in. I'm not going to make these boards - but will offer the files/gerbers on my Github. This whole exercise is because I want to use this as a sample project for a CPLD experimenter board that I am making (SuperBob).

[dublevay]

JCB_SS_largeROMs.jpg (731.08 KiB) Viewed 42698 times

[robcfg]

Nice!

I'll probably order some boards done so I can make one for myself.

Thanks a lot!