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my_ref revC group buy (Mauro Penasa LM3886 design)

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#148
Here is my Transformer. Its the last one on the 2nd page. I have it tied right now 1-6 and 2-5 to get 24V. I could tie 1-2 and get 30 but that 24 and 30 is assuming 240V and I have 115VAC. I dont fully understand what you meant so maybe you could check out the trafo spec sheet. I will try a few suggestions if you can specify pins to tie together.
Uriah

edit: Hmm it wont upload. To big. I will email it to you tomorrow if you can send me your email address.
 
#149
Here is my Transformer. Its the last one on the 2nd page. I have it tied right now 1-6 and 2-5 to get 24V. I could tie 1-2 and get 30 but that 24 and 30 is assuming 240V and I have 115VAC. I dont fully understand what you meant so maybe you could check out the trafo spec sheet. I will try a few suggestions if you can specify pins to tie together.
Uriah

edit: Hmm it wont upload. To big. I will email it to you tomorrow if you can send me your email address.
 
#154
I have been putting together one channel today. Its going well and everything is fitting so far. I had missed a goof on the BOM and ended up ordering a 390k resistor instead of 390. Lucky I had one on another board and removed it from the other. So, all resistors are now populated. Off to do the caps and LM318. My transformer should get here tomorrow. I will probably be able to test one channel tomorrow, but only if I have time. I have some Christmas shopping to do tomorrow and I have to look at replacing my Drill Press as it has given up the ghost. Its been a really bad week, but today was fantastic and made up for the whole rest of it. My daughter is 2 1/2 years old and watching her get excited about Christmas is so much fun.
But, I think things are moving along well with the Group Buy and I have a good feeling that everything is going to work out well. You guys are gonna be pleased!
Uriah
 
#158
So here is the status.
I have the board almost 100% assembled.
A few problems. The .22uf caps that are replacing the .1uf caps are kind of large. They needed to be placed on the bottom of the board. Not a big deal, but not perfect. This is C7, C17, C18, C19, C20, C21. The problem is that they are a bit fat. We will look at an alternative, but this is not a big deal and if an alternative is not as nice as the caps already there then placement on the back of the board will be recommended.
The Faston connectors that go on the board seem to be keyed. We have to find some with exactly the same footprint on each side so that they fit the holes. They wont go in very well right now.
Easy fixes.
Uriah
 
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