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Re: WHOOPS ! (oh not not him again)
Posted: Fri Jul 07, 2023 10:59 pm
by dublevay
robcfg wrote: ↑Fri Jul 07, 2023 10:00 pm
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 45621 times
Re: WHOOPS ! (oh not not him again)
Posted: Sat Jul 08, 2023 12:01 am
by 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.
Re: WHOOPS ! (oh not not him again)
Posted: Sat Jul 08, 2023 1:28 am
by dublevay
Thanks - that may help a lot. I'll take a look tomorrow.
- JCB_SS.jpg (105.54 KiB) Viewed 45614 times
Re: WHOOPS ! (oh not not him again)
Posted: Sat Jul 08, 2023 11:07 am
by robcfg
Oooooh, looking good!
Tell me if you need the file with all the layers.
Re: WHOOPS ! (oh not not him again)
Posted: Sat Jul 08, 2023 9:26 pm
by dublevay
Re: WHOOPS ! (oh not not him again)
Posted: Sat Jul 08, 2023 9:27 pm
by dublevay
I may replace the 2732 layout with a 2764-27512 one, to make sourcing EPROMs easier.
Re: WHOOPS ! (oh not not him again)
Posted: Sun Jul 09, 2023 12:08 am
by 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.
Re: WHOOPS ! (oh not not him again)
Posted: Sun Jul 09, 2023 12:44 am
by dublevay
robcfg wrote: ↑Sun Jul 09, 2023 12:08 am
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).
Re: WHOOPS ! (oh not not him again)
Posted: Sun Jul 09, 2023 2:12 am
by dublevay
- JCB_SS_largeROMs.jpg (731.08 KiB) Viewed 45575 times
Re: WHOOPS ! (oh not not him again)
Posted: Sun Jul 09, 2023 10:52 am
by robcfg
Nice!
I'll probably order some boards done so I can make one for myself.
Thanks a lot!