The YARRA Preamplifier/HPA for Melbourne DB Group Buy

[yourownbuzz]

It will work fine without the Yarra (but kind of messy), and you will need a clean dual rail PSU. 18v should be ok for a HPA - you will need to adjust the resistors on the CCS to get the current up to, say 80mA to 100mA for driving lower impedance phones. I used mine with only 42mA bias and they worked surprisningly well on 55ohm headphones.

Maybe just get a set of Melbournes to play with? They are TH.

Yep that sounds good - which resistors would need changing?
I'll send you a PM about board order instead of clogging up this thread

 

[xrk971]

I finally have word that the Yarra production boards are shipped and on their way.

 

[gary s]

That is good news X - more work for you once received at your end.

 

[zman01]

Good to know X. Can't wait to see the builds happening.

 

[TboneAK]

Thats Great news! The parts are trickling in for the build.

 

[JPS64]

Hello builders,


here link for eDrawing file download (viewer tool is free):

YARRA PREAMPLIFIER_GX383.EASM - Google Drive


JP

 

[batty]

Here is my Melbourne board for the Yarra so far, have I got the shorting links in the right place? I just want to make sure before I go any further.
Thanks

 

[xrk971]

Yes that looks good. R101, C103, C121.

 

[batty]

Cool, thanks.

 

[Vunce]

Hello All,
I just looked at the Mouser Yarra cart and it’s missing a few items that were originally there. I don’t know how that could happen but, hold off on placing your order until I confirm. Sorry for the inconvenience.

Vunce

 

[Vunce]

The Schurter power entry items have returned to the cart
Regards,
Vunce

Mouser Electronics

 

[batty]

Thanks

 

[Oracle1]

For the C155,156,157,158,175,176,177,178 instead the 4700uf/35v can i use

(647-UKT1V682MRD) 6800uf/35v ?

 

[xrk971]

The Yarra boards arrived yesterday. They look great and this has got to be the heaviest shipment I have ever received in PCBs. This stack of 30 boards weighs 15lbs - a truly magnificent bruiser of a PCB. Superb layout by JPS64 as usual. I also ordered some extra input panel PCBs with a modified pin geometry for the rotary switch. I will include those at no cost and they will give you a spare input panel with holes for both a Lorlin and a C&K rotary switch.

 

[TungstenAudio]

Those are beautiful

 

[gary s]

Hi x, looking good, I assume you will be sending out Paypal invoices for these as well very soon, looking forward to starting that build.

Do you know where JPS is up to with regards pricing on the enclosure?

regards,

Gary..

 

[batty]

Have the power entry parts on the BOM dissappeared again, I just made my order and once purchaced I checked the listing and there were no power entry parts.

 

[xrk971]

Hi Gary,
Sorry I did not know you had yet been invoiced for the Yarra PCB. Will send that out.

I don’t know what is happening with the custom case GB but we have probably 20 interested people. Will have to wait to hear from JPS64.

 

[Vunce]

You are correct Batty!!
I just checked and they are missing again, also the whole Yarra cart has vanished from my Mouser account!
This is the second time this has happened and it’s the only saved project affected. I’m a bit baffled by this??????

 

[gary s]

Hi x, just sent through me Paypal payment for the Yarra PCB, thanks.

regards.

Gary..