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BOSC - HiFi Monoblock Class-D GaN Amp

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wilson36

Member
Joined 2019
Hi, first post here, just place an order for 2 of these amp modules (these could be in stock soon). I plan on building these as mono blocs but in slightly larger cases. I'm just trying to decide on the power supplies; cui 56v vs murata 54v, both have similar specs. Tending towards cui as that's the one Leo uses plus its plug and play (the murata could be a neater one box solution). Are there any other reasons for choosing one over the other?

First amp/electronics build so I'm on a learning curve, one question I have is regarding stand off height, would 8mm be sufficient?
 
orchardaudio

orchardaudio

Member
Joined 2017
orchardaudio.com
wilson36 said:
First amp/electronics build so I'm on a learning curve, one question I have is regarding stand off height, would 8mm be sufficient?
Click to expand...

Yes 8mm is sufficient for standoffs.

The Murata power supplies are the ones I use inside my integrated amp (see picture). Both CUI and Murata deliver the same performance.

Good luck!!!
 

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poseidonsvoice

poseidonsvoice

Member
Joined 2004
audiocircle.com/gallery/index.php?cat=48485
Paid Member
BWRX said:
I'd be interested in hearing if any of you were able to successfully build up a board because I'm going to attempt the same thing - as long as all the components are available that is.
Click to expand...

You have to use a stencil if you want to build this successfully. I am quite good at SMD soldering but there are some incredibly small parts where a microscope would come handy. On a few of the parts I had to enlist local help but thankfully the stencil made it easy.

Here is my build:

Orchard Audio Bosc (GaNFET Class D) vs. Hypex & Co. ? | Audio Science Review (ASR) Forum

Leo was kind enough to measure my build to verify I didn’t screw it up.

It continues to be my Class D reference.

Best,
Anand.
 
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BWRX

BWRX

Ex-Moderator
Joined 2005
I'm also very proficient at soldering with the proper tools but am still considering converting a toaster oven to a mini reflow oven just to do these boards. If you've already built some boards with a stencil would you still happen to have that stencil and be interested in selling said stencil? :) (I'm assuming there is only one version of the board in production)

Leo - if you'd prefer that we have this conversation outside this thread just let us know.
 
orchardaudio

orchardaudio

Member
Joined 2017
orchardaudio.com
BWRX said:
I'm also very proficient at soldering with the proper tools but am still considering converting a toaster oven to a mini reflow oven just to do these boards. If you've already built some boards with a stencil would you still happen to have that stencil and be interested in selling said stencil? :) (I'm assuming there is only one version of the board in production)

Leo - if you'd prefer that we have this conversation outside this thread just let us know.
Click to expand...

I do no have any stencils, if you would like to get one from somebody here who had them made (eg poseidonsvoice) you are welcome to do so.

As for the version the current boards that I am shipping are rev 2.0b, many people here who purchase boards a while ago and have not assembled them yet have version 1.5.

The only difference between rev 1.5 and rev 2.0 is addition of an input buffer which also gives rev 2 board an input impedance of 44k versus the 5k on rev 1.5.

Audio performance on both revs is identical.
 
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