It looks like the board accommodates different pot pin layouts. 3 pins aligned or 3 pin triangle like the 3386k. I have used the 3296Ws - it seems like it would work with the flexible layout - here is the 2k part.
652-3296W-1-202LF
652-3296W-1-202LF
I have compared the 2, and the only specced difference I can see is that the 3299 is specced to handle up 125 degrees C while the 3296 is specced to 150 degrees C. But I will add it as another option on the list.
I also see that for the 3299 series they spec the Number Of Turns as Multi-Turn, while the 3296 is specced as 25. What does that actually mean?
3299 added as an option.
3299 added as an option.
I believe the wiper on the 3299 is a little heaver, maybe a double. Just more duarble part. Difference in price is minimal, in the schem of things. Unimportant if you plan on replacing with fixed resistor.
I agree that the price difference is irrelevant. We just need to make sure it fits since the 3299 is larger: 3/8" square vs. 1/4" square for the 3296.
Actually, I think both will be fine. I have scaled the PCB on my PC screen and I believe the 3299 will fit.
Actually, I am more concerned about C2 and C3. I would seem from my measurements on screen that the 50V Nichicon Muse (KZ) and Elna Silmic II options with 7.5mm lead space will not fit. The Nichicon Fine Gold (FG) option will fit though. I do see however that there is a 35V Elna Silmic II that will fit, but that specific part is not yet available from Mouser. There is unfortunately not a Nichicon Muse in 35V available. So I leave it to the builders to make up their own minds as I believe that the Nichicon Fine Gold is a good enough cap for those positions.
C2 and C3 5mm spacing. Maybe we can add later in final rev PCB so it can accomodate 5 and 7.5 mm caps.
Pots 2.54mm spacing
Didiet
Pots 2.54mm spacing
Didiet
Didiet
Is it possible that I can get a PDF of the top layer only to print. It will make it easier for me to check spacing without having to measure with a ruler on the PC screen?
Henry
Is it possible that I can get a PDF of the top layer only to print. It will make it easier for me to check spacing without having to measure with a ruler on the PC screen?
Henry
Good, now that I have a nice printed copy of the top layout I can see that the 3296Y and 3299Y models of the trimpots will also fit, and is actually a better choice than the W variants since the mounting to the board will be sturdier because of the staggered layout of the pins. I will add the Y variants to the list of pots and consider the selection of pots on the BOM now more than adequate unless somebody has something else worthwhile to add.
Updated BOM.
BTW, for some odd reason MS Words conversion to PDF is not working too well as you can see that some table lines are missing when viewing on screen. It does show on the printed version but somewhat thinner than the other. Odd.
BTW, for some odd reason MS Words conversion to PDF is not working too well as you can see that some table lines are missing when viewing on screen. It does show on the printed version but somewhat thinner than the other. Odd.
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