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Other options for a headphone amplifier.

Posted 15th December 2011 at 01:02 PM by rjm
Updated 15th December 2011 at 01:08 PM by rjm

While I wait for the guys at 47 labs to get the Treasure 0247 together, I took a look around at some of the alternatives.

The Yulong D100 looks quite attractive and for about 2/3 the price of the 0247 kit you get a fully assembled unit!

review at head-fi

Or if you can do without a DAC, HLLY audio has your standard "transistor buffered op amp" implementation in a no-frills case:

HLLY RMK-5

It's listed at $240 but for sale on eBay for only $99 right now.

Of course there are dozens, but I single those two out as being particularly deserving of "honorable mentions". I'm still set on the 0247 though.
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47 Labs "Treasure" Model 0247 DAC/Headphone/Preamplifier

Posted 14th December 2011 at 05:56 AM by rjm
Updated 17th December 2011 at 01:36 AM by rjm

Just placed my order for this. I am customer no. 00028!

47 Labs web page

I figure I owed it to them. 47 Labs has been good to me, and the DIY community over the years, one way or another: gainclone, phonoclone, even the DAC-of-the-Klones.

Besides, several reasons:

1. I really want to finally hear 47 labs gear, instead of trying to reverse engineer it all the time!
2. It will be interesting to compare it against the sapphire amp.
3. I'm sure it will be fun to build and examine up close.
4. It's my Christmas present.
5. And hammertone. Finish a audio product in grey, or even better, green hammertone, and its as bees to honey...

Will blog the unboxing, building, and testing right here.
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RJM Audio Kits : Available ... again!

Posted 11th December 2011 at 11:09 PM by rjm
Updated 13th December 2011 at 05:08 AM by rjm (updated with price info)

Back by popular demand, I have decided to go ahead and prepare full kit version of the VSPS300, Phonoclone 3, and Sapphire projects.

10 kits of each project will be available - contact me to reserve.

Phonoclone Kit : $125 (10 availble) Set of two boards and components to populate.
VSPS 300 Kit : $117 (10 available) Set of two boards and components to populate.
Sapphire Kit : $113 (10 available) Set of two boards and components to populate.

Kits will be shipping shortly after the New Year.

Current status: necessary parts shipped from Mouser, should be able to assemble kits this weekend. Also have to prepare the documentation.

RJM Audio Kits
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RJM Audio, now on Google+

Posted 21st November 2011 at 11:06 AM by rjm

I hate facebook but I'm willing to give Google+ a go. Now they have "product" pages as well as "people" pages, I have made a little port to RJM Audio.

RJM Audio Google+ page
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Sapphire Desktop Headphone Amplifier Kit

Posted 8th September 2011 at 05:26 AM by rjm
Updated 10th December 2011 at 01:23 PM by rjm (add some photos)

Update: kits were sold, but another run of boards is going ahead!

There will be 10 kits available, at a cost of $100 each. The boards (rev. 14a1) and all parts for the boards will be included. Shipping is included.

Info here and here.
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VSPS Kit

Posted 3rd August 2011 at 12:21 AM by rjm

My notes tell me the first VSPS Kit was shipped on July 24th 2009. Two years later, there are just over 15 of the 100 kits left unsold. This was a limited edition, once gone they are gone and at the current rate that will happen before the end of the year.

So if you had it in mind to get one...

ordering page
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Emitter resistors and diamond buffers and distortion

Posted 3rd April 2011 at 03:36 PM by rjm

Plenty of helpful advice in response to my question on emitter resistors, here.

And so finally I finish my prototype Sapphire amplifier, pictured below. The case is from Chinese audio outfit hlly, and very good. I bought it on eBay.

The rest of the components are described on my web page.
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Sapphire Headphone Amplifier

Posted 28th March 2011 at 02:15 PM by rjm

Since I was effectively blogging my progress with the project as a forum thread anyway, perhaps it would be better to make it a blog rather than a post. I'm open to the idea, but does anyone ever read these blogs?
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