API 312 layout/PCBs

**fallout** · 10-03-2003 10:48 AM

Well, i guess it's API fever time now that the output trannies rolled in.. So has anybody come up with any PCB layouts yet? [img]smile.gif[/img] My plan is to make 4 with the Avedis 1122's and 4 with 990's, incorporating a phase reversal switch and phantom power to the circuit. I'd assume the only differnces in the layout would be for the input transformers? Perhaps the Lundahl 1538 XL for the 1122's and a Jensen model for the 990's? Is anyone up for a group order of PCBs, perhaps some nice plated through hole types? I'd be willing to do the ordering.. Let me know what you guys think..

-Jay

**kato666** · 10-03-2003 11:47 AM

I've asked about this before with no responses. As far as I can tell, nobody has a PCB file yet - at least not one they care to share.

So, since this is DIY, I decided to DIM. (do it myself.) However, this will be my *first* PCB EVER - so you can't really count on me to do it right - but I promise to do my best. And I'll be happy to share when it's done.

I just downloaded some software to make schematics / PCB traces and I'm learning how to use it now.

I will post my artwork when it's finished (hopefully next week.) I'd love some feedback if the experts want to check it for errors. Stay tuned!

More thoughts on the subject:
I think the main reason we don't have an API 312 Group standard PCB trace is that it will be impossible for everone to agree on a configuration. Some are using Jensen inputs, others Lundahl - some will be mounting them on the PC board, others will use the standard ones with wires hanging out, etc.

If anyone out there has an unpopulated 312 card, please drop it on your scanner bed and make a scan. It would be an excellent starting point that most people could agree upon. Then we can all modify to our hearts content...

Kato

**rascalseven** · 10-03-2003 01:01 PM

I have a couple of Brent Averill-racked 312's at the studio. I'd be glad to take a couple of pictures and send them to anyone interested in laying out the circuit.

I won't be able to do it till Monday, however (not going back to the studio over the weekend).

If anyone is interested, PM me.

Peace,

Joel

**Mark Burnley** · 10-03-2003 01:06 PM

But for now, this'll have to do!
(I can't remember where I got this from- I just snagged it and put it in my "useful TechTalk Folder"- thanks to whoever posted it originally [img]graemlins/wave.gif[/img] )

...I reckon I'll have to get in on the next batch of transformers...

Good luck to all you API'ers, looking forward to seeing some top projects!

[img]graemlins/thumbup.gif[/img]

Mark

**fallout** · 10-03-2003 02:02 PM

Do you guys think a phase reverse switch would be too much trouble to implement in this circuit? The only thing i really 'need' is phantom power, which shouldnt be a problem.. Anyone have a nice power supply that work well with the 312 w/ Phantom power?

-Jay

**Tadgos** · 10-03-2003 02:32 PM

Hey guys,

I have a pcb layout I've made with express pcb. It's the first prototype but it is functional. It's layed out for the Sphere input transformers that Dan Kennedy has for sale and the TX's we got from James. I've already made one card (but used the 2623 output TX) and everything works fine. I used Peter C's green pre psu (+15/-15v) to test. I'm very pleased with the result. If anyone would like to get a copy of the pcb file they're more than welcome to it. You can alter anyway you see fit for your purposes.

Later,

**ciminosound** · 10-03-2003 02:50 PM

Hi John,

I'd love a copy, sent it to ciminosound at yahoo.com

Gerry

**Flatpicker** · 10-03-2003 03:25 PM

I'd like one too, John. Thanks!

**Tadgos** · 10-03-2003 03:43 PM

Hey Gerry,

Check your email. Flatpicker, Could you pm me your email?

Oh yeah, I don't have onboard phantom or phase yet. I will put phantom on there. Probably no phase though. My console and my daw both have this function so it's not neccesary at this time.
later

**moby@ptt.yu** · 10-03-2003 06:32 PM

Hi everybody. Are you talking about 312+ 2520 onboard, or some other op? If sobebody finally made 2520 traces it will be nice to hear and have a copy of that! [img]graemlins/wave.gif[/img]
Sergio
P.S. Something interesting, please email at moby@ptt.yu

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