Very clear Andy, not a deal breaker to go from 35V to 50V, will add these to the BOM and thank you for also clarifying about C3 🙌
Edit, unfortunately noting in 50V flavour available, wait to hear about staying safe with 35V or look elsewhere for 50V ones
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@Gricko unfortunately, at least on the Italian Mouser, 50VDC ones are due to be stocked in quite a while, 35VDC are available but not too many of them so I rather go for 35VDC ones and have all the parts to then eventually upgrade when time for welding comes, thanks for pointing them out.
@Dennis Hui grazie Dennis, yes, the Sigma 22, once I get the boards, will have to output 30VDC to the BA-3
A source of confusion, for me as an Italian, is your AC/DC, no, not the Highway to Hell, vs our CA/CC where CA stands for Corrente Alternata and CC for Corrente Continua and I keep thanking Mr Tesla for his genius.
I am attaching here the last rev of the BOM, I wait for yours all approval and then submit it to my friend for another check as he has a lot of stuff in stock, once cleared I will go on and order and then move onto the PSUs
Grazie
@Dennis Hui grazie Dennis, yes, the Sigma 22, once I get the boards, will have to output 30VDC to the BA-3
A source of confusion, for me as an Italian, is your AC/DC, no, not the Highway to Hell, vs our CA/CC where CA stands for Corrente Alternata and CC for Corrente Continua and I keep thanking Mr Tesla for his genius.
I am attaching here the last rev of the BOM, I wait for yours all approval and then submit it to my friend for another check as he has a lot of stuff in stock, once cleared I will go on and order and then move onto the PSUs
Grazie
This is on-line reseller,just order and...voila.And this is parts Mouser dont have in stock.But as you wish.
I noticed you have RN60 resistors for a couple of values (47K and 22 ohms). Just keep in mind that they are physically somewhat larger than regular 1/4W resistors. If I read things correct they are used in the R2/R10/R11 positions which has fair bit of space on the PCB so they should be fine. RN60 at the R3/R4/R5 positions will probably be a bit cramped.
It keeps stunning me the eye you have for these things!
I went through the BA-3 BOM and the one I arranged onto Mouser, let's go through it again and sorry for ripping so much space and time for these basic issues; I did measure the space resistors take on the board, hole to hole about 13mm except R13 which allows 20mm, I pulled down the measures of the ones I picked on Mouser:
R1 1x 6,73mm
R2 1x 8,74mm
R3-4 2x 3,81mm (!!!)
R5-6-7-8-9-12 6x ??? isn't the same as R1? I got confused as on the BOM is either indicated 1K value or 100R one...
R10-11 2x 8,74mm
R13 1x 14,1mm
All the Resistors in my BOM are Vishay and 1% tolerance besides R13, what did I do wrong?
Oh, ok, @ozorfis I picked different series ones, CCF, CPF, RN60... which series should I pick from?
Grazie mille
There's nothing wrong with the parts you have chosen. There are simply a lot of variations in part sizes.
If you want a pick a uniform series to use, you might consider the Vishay CMF55 or RN55 resistors. I like them because the values are printed on the parts as opposed to the use of colour code.
If you want a pick a uniform series to use, you might consider the Vishay CMF55 or RN55 resistors. I like them because the values are printed on the parts as opposed to the use of colour code.
@Giovanni1968
The printed values make things much easier to troubleshoot should the need arise. Be sure to install them with the values visible if you choose these. As Dennis noted, there are a few different types in the BoM I sent you. That's just what I happened to have in my stash and/or were in stock at the supplier when I bought them. They all fit nicely. I built 4 with those parts, and they all happily sing. It would be more uniform to choose only one style, but I'm not that picky. 
I used CMF vs. RN in my latest build. If you're looking for substitutes, the only ones I would avoid are the 0.1% tolerance parts, if only because they are much more expensive and not needed. As Dennis mentioned earlier any 1% parts are just fine. No need to over-think it.
Ok I made a mess with values, series, sizes...
This is the updated BOM, all resistors should be correct now, Vishay RN series, 1% tolerance for them all besides the 330 Ohm, all same 8,74mm size, please give it another check and hopefully I can move on with this
Grazie and apologies
Giovanni
This is the updated BOM, all resistors should be correct now, Vishay RN series, 1% tolerance for them all besides the 330 Ohm, all same 8,74mm size, please give it another check and hopefully I can move on with this
Grazie and apologies
Giovanni
Grazie Patrick,@Giovanni1968
I did a recheck and hopefully done with BA3 BOM besides C3, all resistors from Vishay and RN series which should comfortably fit, will get a few more than necessary even tho the friend who's gonna help me put it all together has tons of stuff, better a couple more than one less...
I didn't check all the values against the schematic. I assume you've done that correctly. The only thing that jumped out to me was that your 47K resistor is a 0.1% part. Check the cost against the 1% part and make your choice. Saves you a few pennies if you go with the 1%. 
71-RN60C4702F/R is a good example. There's at least one more, but it's showing very low stock on my end.
Having a few extras is definitely nice.
71-RN60C4702F/R is a good example. There's at least one more, but it's showing very low stock on my end.
Having a few extras is definitely nice.
Updated the BOM with these ones, you guys are amazing, it sure takes time to find out these details and time is precious.I didn't check all the values against the schematic. I assume you've done that correctly. The only thing that jumped out to me was that your 47K resistor is a 0.1% part. Check the cost against the 1% part and make your choice. Saves you a few pennies if you go with the 1%.
71-RN60C4702F/R is a good example. There's at least one more, but it's showing very low stock on my end.
Having a few extras is definitely nice.
Free cold beer for all of you once here!!!
If you're ordering extras, see if it makes sense to go up to the next order quantity to get a price break. Sometimes it's cheaper to get 10 than to get 5 or 6. 🙂
Hello Dennis,
I will check it out, I have an extra BA-3 board and might think of filling it up for my friend and then maybe also add an extra Sigma 22, dunno if a good idea since he owns a high end 7K preamp but to go a few extra pieces won't break the bank and might come handy, will check before placing the order, important it that I know the BOM being correct!
Grazie
I will check it out, I have an extra BA-3 board and might think of filling it up for my friend and then maybe also add an extra Sigma 22, dunno if a good idea since he owns a high end 7K preamp but to go a few extra pieces won't break the bank and might come handy, will check before placing the order, important it that I know the BOM being correct!
Grazie
Giovanni,
Can you please check your order quantities? Based on the schematics on the first page I got the following for two channels:
1K x 2
47k x 2
10R x 4
100R x 12
22R x 4
332R (3W) x 2
500R trimmer x 4
100R trimmer x 2
1000uF x 4
Your 100R quantity in particular seems to be too low.
Can you please check your order quantities? Based on the schematics on the first page I got the following for two channels:
1K x 2
47k x 2
10R x 4
100R x 12
22R x 4
332R (3W) x 2
500R trimmer x 4
100R trimmer x 2
1000uF x 4
Your 100R quantity in particular seems to be too low.
This is the shopping cart, as suggested to buy ten is slightly more expensive than even 4 per part
Way too cheap
otherwise OK.
I think they will just about fit. But you should measure the boards /C3 position first, to be sure. Some use oversized caps. I prefer some that actually fit 🙂
Regards,
Andy