Help! Searching for API 312 files...

CheapChip · Apr 15, 2013

Hi everyone!
I'd like to build a dual API 312 pre with OEP trannies. My wish is building it from A to Z (self-etching PCB, etc...).
But here is my problem: all links I could find through the web were dead, no PDF of any complete project available!

Has anyone archived something like this?

Thank you all!

Sredna · Apr 15, 2013

Sredna · Apr 15, 2013

CheapChip · Apr 16, 2013

Hey thanks Sredna!

But I already saw it and this layout is for 500 format. I'd rather like standard boards for a 1U rack.
So I need a preamp board layout, a PSU layout, a scheme and a BOM.
For example , it would be great if someone had the Fabio's R312_Rev3.PDF or such a thing. Every links I found were dead.

Though, thanks again!

Sredna · Apr 16, 2013

Like this?

Beware of a design mistake in the PSU, the relay voltage is taken from the 48V rail.
It's better to use the other + rail, could be done with a simple cut + jumper.

Sredna · Apr 16, 2013

PSU BOM

Sredna · Apr 16, 2013

PSU etch

Sredna · Apr 16, 2013

PSU layout

Sredna · Apr 16, 2013

Sredna · Apr 16, 2013

R312 etch

Sredna · Apr 16, 2013

R312 BOM

Sredna · Apr 16, 2013

R312 layout

okgb · Apr 16, 2013

there's so few parts you could make it point to point
the a-z info , you may have to put together yourself , plenty of modern information
you can use to build as authentic an 312 as possible [ there never was an original a.p.i. " kit " ]

CheapChip · Apr 16, 2013

Wooow!
Exactly what I was looking for!
Many thanks to you, Sredna!

I prefer building it on PCB as a base for starting. I think it's clearer in case of mistake.

Time to etch!

Thanks again!

Sredna · Apr 17, 2013

You're welcome!

But beware that the Reliqia312 project has many options and features that you may not need
(servo, relays, line in, hi Z in) so study the schematic and the threads to get an understanding of it
before you start building.

A way easier project ist the Access-312 from Jorge Aristondo (3nity), no self etching but very easy to build and excellent quality.

okrevolver · Jul 29, 2014

Hi, this is my first post.

Sorry for my noob question, is this pcb suitable for a 500 rack?

i own 2 oep a262a3e transformers and 2 jensen je123s outputs and i would like to build 2 500 series api preamps. Any tips?

Thanks in advance.

fallout · Aug 3, 2014

okrevolver said:
Hi, this is my first post.

Sorry for my noob question, is this pcb suitable for a 500 rack?

i own 2 oep a262a3e transformers and 2 jensen je123s outputs and i would like to build 2 500 series api preamps. Any tips?

Thanks in advance.

Nope, that looks like a clone of the original 312 card. The pinouts aren't the same for a 500 series rack.

MountCyanide · Aug 3, 2014

You CAN use it and wire up those terminations to standard VPR format on a 500 series edge connector adapter from Classic API and then mount it all on an L bracket.
Or just re-draw that file and re-route everything.

fallout · Aug 3, 2014

MountCyanide said:
You CAN use it and wire up those terminations to standard VPR format on a 500 series edge connector adapter from Classic API and then mount it all on an L bracket.
Or just re-draw that file and re-route everything.

Of course you CAN but whats the point when there's so many 500 series projects?

MountCyanide · Aug 3, 2014

To learn!
And because he's asking on this thread and not on a VP312, Access, Bicycle, etc one. I'm assuming he (also assuming "he" as well) wants to do a raw project to get some dirty hands and a bit more satisfaction because yes, indeed, there's a ton of ready to go and well documented current projects that those transformers can be popped onto. I did a pair of whistle rock 312's but then after that I used these for a more primitive DIY from-scratch project to remove some training wheels. And learned a bunch from that. So I figure he's got the same itch.

Help! Searching for API 312 files...

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