SNAC 6 button support?

retrorepair
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Re: SNAC 6 button support?

Unread post by retrorepair »

Told you :lol:

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.
dshadoff
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Re: SNAC 6 button support?

Unread post 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).
antoniovillena
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Re: SNAC 6 button support?

Unread post by antoniovillena »

Hi Brettster

Follow his BOM:

https://github.com/dshadoff/MiSTer_PCE- ... v3/bom.csv

I have not changed his designators
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Brettster
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Re: SNAC 6 button support?

Unread post 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!
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antoniovillena
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Re: SNAC 6 button support?

Unread post by antoniovillena »

Attached positions of components
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comp4.png
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comp3.png
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comp2.png
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comp1.png
comp1.png (83.19 KiB) Viewed 661 times
antoniovillena
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Re: SNAC 6 button support?

Unread post by antoniovillena »

Latest one
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Brettster
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Re: SNAC 6 button support?

Unread post by Brettster »

Well I have built it and it works perfectly :) Thank you so much for the help guys and especially to Antonio for Routing the board and putting up with my endless questions.
My soldering isn't the best of course but these things are super tiny!!

Tested with Avenue pad 6, Avenue Pad 3 and everything is working as it should, inc turbo fire and slow motion.
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pcb1.jpg
pcb1.jpg (1.95 MiB) Viewed 645 times
:D :D :D :D :D :D :D :D :D
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dshadoff
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Re: SNAC 6 button support?

Unread post by dshadoff »

You did this as a first-time project, and ended up with those results ?
I am truly impressed !
antoniovillena
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Re: SNAC 6 button support?

Unread post by antoniovillena »

Yes. Very professional. Congratulations
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Brettster
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Re: SNAC 6 button support?

Unread post 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 :)
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retrorepair
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Re: SNAC 6 button support?

Unread post by retrorepair »

I agree, that's excellent work indeed! Well done!
antoniovillena
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Re: SNAC 6 button support?

Unread post by antoniovillena »

Finally I am producing fixed version of PCE splitter

Image
Squaresoft74
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Re: SNAC 6 button support?

Unread post by Squaresoft74 »

Ordered one, many thanks Antonio. :)
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Brettster
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Re: SNAC 6 button support?

Unread post by Brettster »

wow like the simplified design and just one IC to solder :)
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