Help! Searching for API 312 files...

[CheapChip]

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]

8)

 

[Sredna]

8)

 

[CheapChip]

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]

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]

PSU BOM

 

[Sredna]

PSU etch

 

[Sredna]

PSU layout

 

[Sredna]

R312

 

[Sredna]

R312 etch

 

[Sredna]

R312 BOM

 

[Sredna]

R312 layout

 

[okgb]

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]

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]

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]

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]

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]

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]

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]

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.