help with SCA A12

pritsinghs3 · 21st January 2012

I'm kind of stuck in a weird position. I bought some DIY preamps from Seventh Circle Audio. This post of for people who are familiar with their products and have built or at least tried to build these things. I just completed my first A12 preamp with transformer and sc25 opamp. When I power it up, the LED light on the module doesn't turn on. I'm sure I did everything correctly. My soldering also looks fine. The only thing I can recall doing is sometimes (maybe happened 4 times) I had soldered the wrong thing, and then I had to un-solder it and solder on the right component. Other than that, I KNOW I have the right components on the right part. What can I do?

PS: The ONE and only thing that didn't make sense to me wat item 18, which is the 2 way pin header. For some reason, the bill of materials say J1, J2, J5, J6 but the quantity is ONLY 1!!! Doesn't it mean install it in "either" one of those? I then looked at the high def photos of the module, and there are actually NO J1 and J2 reference points and the J5, and J6 reference points are EMPTY, so I left it empty as well. PLEASE HELP!

superwack · 21st January 2012

Sorry I can't help BUT this is posted in the NEW PRODUCTS forum - you might have more luck in GEEKSLUTZ - good luck

a zombie · 22nd January 2012

thread was reposted here

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21st January 2012	#1
pritsinghs3 Gear interested Joined: Mar 2009 Posts: 19 Thread Starter	help with SCA A12 I'm kind of stuck in a weird position. I bought some DIY preamps from Seventh Circle Audio. This post of for people who are familiar with their products and have built or at least tried to build these things. I just completed my first A12 preamp with transformer and sc25 opamp. When I power it up, the LED light on the module doesn't turn on. I'm sure I did everything correctly. My soldering also looks fine. The only thing I can recall doing is sometimes (maybe happened 4 times) I had soldered the wrong thing, and then I had to un-solder it and solder on the right component. Other than that, I KNOW I have the right components on the right part. What can I do? PS: The ONE and only thing that didn't make sense to me wat item 18, which is the 2 way pin header. For some reason, the bill of materials say J1, J2, J5, J6 but the quantity is ONLY 1!!! Doesn't it mean install it in "either" one of those? I then looked at the high def photos of the module, and there are actually NO J1 and J2 reference points and the J5, and J6 reference points are EMPTY, so I left it empty as well. PLEASE HELP!

21st January 2012	#2
superwack Lives for gear Joined: Mar 2007 Location: Burbank, CA Posts: 1,409	Sorry I can't help BUT this is posted in the NEW PRODUCTS forum - you might have more luck in GEEKSLUTZ - good luck __________________ - "I don't know if we OVER think mixing but I do know we seriously UNDER think recording... which is really a damn shame." - CN Fletcher, 2012 -

22nd January 2012	#3
a zombie Gear addict Joined: Apr 2009 Location: Seattle, WA Posts: 438	thread was reposted here ******//www.gearslutz.com/board/geeks...2-mic-pre.html __________________ www.customanalogservices.com

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