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Re: SNAC 6 button support?
Posted: Fri Aug 28, 2020 12:38 pm
by retrorepair
Told you
Here's the datasheet for the level shifter ICs:
https://www.ti.com/lit/ds/symlink/sn74l ... co.uk%252F
It looks like the DIR pin is tied to GND so the input will be the B pins and the output the A pins.
So yes, pin 1 is indicated by the line. Both of the top pins on this side (1 and 8) are VCCA/B and you can see are tied to smoothing caps.
The rest should be self explanatory.
Re: SNAC 6 button support?
Posted: Fri Aug 28, 2020 7:39 pm
by dshadoff
retrorepair wrote: ↑Fri Aug 28, 2020 12:38 pm
It looks like the DIR pin is tied to GND so the input will be the B pins and the output the A pins.
So yes, pin 1 is indicated by the line. Both of the top pins on this side (1 and 8) are VCCA/B and you can see are tied to smoothing caps.
Strictly speaking, one chip is "outbound" signals, and the other two are "inbound". The direction pins should not all be set the same way (this is based on my design, but it is laid out dfferently).
Re: SNAC 6 button support?
Posted: Sat Aug 29, 2020 11:53 am
by antoniovillena
Hi Brettster
Follow his BOM:
https://github.com/dshadoff/MiSTer_PCE- ... v3/bom.csv
I have not changed his designators
Re: SNAC 6 button support?
Posted: Sat Aug 29, 2020 12:52 pm
by Brettster
Thanks guys, but as this is my first time building something like this and I'm only a beginner, how do I know where to place each component? the bom lists C1 etc can you draw on my image or is there something readable in the gerbers to help me place them?
Sorry for the noob questions!
Re: SNAC 6 button support?
Posted: Sat Aug 29, 2020 2:22 pm
by antoniovillena
Attached positions of components
Re: SNAC 6 button support?
Posted: Sat Aug 29, 2020 2:23 pm
by antoniovillena
Latest one
Re: SNAC 6 button support?
Posted: Sat Aug 29, 2020 7:43 pm
by Brettster
Re: SNAC 6 button support?
Posted: Sat Aug 29, 2020 8:58 pm
by dshadoff
You did this as a first-time project, and ended up with those results ?
I am truly impressed !
Re: SNAC 6 button support?
Posted: Sun Aug 30, 2020 11:46 am
by antoniovillena
Yes. Very professional. Congratulations
Re: SNAC 6 button support?
Posted: Sun Aug 30, 2020 2:09 pm
by Brettster
Thank you for the compliments! I can understand why everyone would get these made with the pick an place machine now!
I'm just happy to have my favourite controllers working with PC Engine on MiSTer now
Re: SNAC 6 button support?
Posted: Wed Sep 02, 2020 8:36 am
by retrorepair
I agree, that's excellent work indeed! Well done!
Re: SNAC 6 button support?
Posted: Wed Nov 18, 2020 1:32 am
by antoniovillena
Finally I am producing fixed version of PCE splitter
Re: SNAC 6 button support?
Posted: Wed Nov 18, 2020 1:51 am
by Squaresoft74
Ordered one, many thanks Antonio.
Re: SNAC 6 button support?
Posted: Wed Nov 18, 2020 7:47 am
by Brettster
wow like the simplified design and just one IC to solder
Re: SNAC 6 button support?
Posted: Thu Nov 26, 2020 3:33 pm
by Squaresoft74
I received the fixed version of PCE splitter today, works like a charm.
Many thanks Antonio.