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EHHA Rev A - Interest Thread - Page 7

post #91 of 1654
Thread Starter 

Gents, after much thinking and tinkering, it seems the only way to wire the two boards together is with ... wire.

 

So, here's a new layout. You can see that the amp and PS are totally separate now. To use the onboard PS you just wire across the terminal blocks.

 

I've had to make adjustments to the PS in order to place output caps on the regs for stability when it is operated stand-alone.

 

Still talking with Jeff about how to get this out to you.

 

EHHA Rev A Mod 3.pdf

post #92 of 1654
Thread Starter 

And just so you can also see the top layer ground planes.

 

EHHA Rev A Mod 3A.pdf

post #93 of 1654

That looks too awesome to pass up, I think I'll really have to grab a set of these. :)  Great work Alex.

post #94 of 1654
Thread Starter 

You know gents, now that we are this far, the next step would be pretty easy. That is, have two different boards. One board would have the rail PS at the back and the other board could have a DC heater PS. This would remove the nice channel separation that comes from each having its own reg section, but the linear regs are not bad and this may be a very small price to pay.

 

Then you get everything you need. Almost the single board requested earlier, but maybe more flexible??

 

I'd be willing to do this if you all want it, but it will make the boards more expensive since the lot counts will be cut in half for each board type. How much I don't know.

post #95 of 1654

Can the Out be moved to the side of the board? In a perfect world, it would be optional on R or L, just to make a cleaner wire path to the jack.

 

 

 

post #96 of 1654

Alex, I really like it.

I know the added complexities of adding the heater circuitry to the pcb would prove a headache. BUT...
Have you thought about including another separate matching pcb for the heater, this would make the build much easier, buying all the parts from one supplier. It could be included with the GJA kits additionally. 

post #97 of 1654
Thread Starter 

It won't be very hard to re-do the board by stripping off the rail PS and replacing it with a DC heater PS. Not hard at all. Then you have all that you need except for transformers, jacks, and pots.

 

Al, I'll look at how to get the O/P off to the sides.

post #98 of 1654

How reasonable would it be to add a DC heater supply in the middle of the split supply? :)

post #99 of 1654

Let's not have a separate amp board with dc heater... Its not really that hard to build from scratch, and there's tons of single supply boards on the internet that could be adapted. Pete Millett has it on ebay too. 

post #100 of 1654

Ooh, and it's regulated too. :)  Was just thinking of perfboard, but figured not everybody wants to work with it.

post #101 of 1654

 

Quote:
Originally Posted by ujamerstand View Post

Let's not have a separate amp board with dc heater... Its not really that hard to build from scratch, and there's tons of single supply boards on the internet that could be adapted. Pete Millett has it on ebay too. 


I’m just thinking about this as a package, remember this was supposed to be an easier build than the original EHHA, getting all parts from one source is way more attractive than sourcing parts and extra shipping costs. Not to say, this would be a bit of piss to do - so why not?

post #102 of 1654

The only reason that I could think of right now is to keep the manufacturing cost down. If Jeff will be packing kits for the boards, maybe he could include a breadboard, parts for a DC heater, and a detailed instruction to build one from scratch? It would be a good learning experience for those who never did it before. :p

post #103 of 1654
Thread Starter 

Well, while we continue to talk, here's a board with a regulated 12.6VDC heater supply. Same amp section. 

 

If you don't want the heater supply, maybe we can work it out so you can buy two of the amp boards with the rails PS.

 

EHHA Rev A Heater Mod 1.pdf

post #104 of 1654

Ooh, here's an idea.  Selling 2-board sets... 1 with heater supplies, 1 with dual supplies for amp.  :)

post #105 of 1654

Just curious as to how a 12.6VDC heater would work for each amp board as you’d only need one heater for a stereo amp? Am I not getting it?

 

I really like the onboard psu, my thinking was to offer a DC heater pcb and components along with the ehha rev pcb and components.   

 

 

Quote:
Originally Posted by runeight View Post

Well, while we continue to talk, here's a board with a regulated 12.6VDC heater supply. Same amp section. 

 

If you don't want the heater supply, maybe we can work it out so you can buy two of the amp boards with the rails PS.

 

EHHA Rev A Heater Mod 1.pdf

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