For the benefit of some members (otto) who may be interested in some additional details of this build, I've included a few more pictures.
Special notes:
1) The MUSE volume control I/O is connected to the same location of the VC on one of the 3, Yarra supplied breakout boards. I used the BO board that was designed for a small ALPS VC. That BO board was then attached using SIL connectors as designed for the Yarra. I just had to add small pieces of wire to each end to make everything fit properly.
2) The MUSE volume encoder was attached directly to the front panel with the supplied nut. I had to countersink the back of the front panel to allow more clearance on the front for the nut to fit. It was tight, but it tightened securely and will work just fine.
3) The PSU I used was a simple regulated PCB (from China), that was adjustable to dial-in the +-15volts required. I used a small toroidal xformer and put it under a small foil-lined cardboard cage to help minimize interference. The regulator board is no longer in my eBay history, but you should be able to fine something similar to use and that would fit.
4) The Adafruit display was fit to the front panel using my retro-design of the FP using Front Panel Express. It is simply using 3 small aluminum clips to hold it securely in place. The black tape around is used to help light leakage around the edges and hold some wires/connector in place. Not my best work.
5) As can be seen in most of the attached images, I used various connectors to fit everything the way I needed, and twisted all cables.
6) A little extra studying of the Yarra schematic and layout, along with the MUSE PCB will be helpful to understanding how everything fits together.
Hope this helps. I had a to do a little dismantling of my pre to get these new pictures, so hope they will provide more clarity to those wanting to tackle this build.
?Attachments
Thank you.
Research? I’ve learned over time, upfront often saves time later
And thank you again, for your efforts generally
Btw I should let you know
For me at least, lately, there have been delays, in some cases several days (!)! before I get a notification of a new post on a thread I’m following
Those RCA jacks
would be a solution, tho exxy … As six pairs are needed it would total ~ USD 90. ~ $ 120 in my currency. Might you do a better price for six, especially as getting the Yarra boards, a couple of daughterboards.
(And several BTSB, When I finally(!) decide for certain which ones would work best for me) Your specific response to me about options for cases for it - unless I accidentally deleted the email – extremely unlikely – I only came across by accident
Cheers
xrk,
Reconciling Redjr’s description with what’s now on Etsy, and generally
Redjr wrote -
1) The MUSE volume control I/O is connected to the same location of the VC on one of the 3, Yarra supplied breakout boards. I used the BO board that was designed for a small ALPS V
From Etsy, * all of the amp boards are now sold separately
While the “Yarra suppled breakout boards”, Etsy says
“Included in boardset are an input selector switch panel for rotary switch and RCA jacks, board for remote volume pot (various types), and dual rail dual monoblock PSU”
… BO is an acronym(?) for the remote volume pot board?
Thank you
Reconciling Redjr’s description with what’s now on Etsy, and generally
Redjr wrote -
1) The MUSE volume control I/O is connected to the same location of the VC on one of the 3, Yarra supplied breakout boards. I used the BO board that was designed for a small ALPS V
From Etsy, * all of the amp boards are now sold separately
While the “Yarra suppled breakout boards”, Etsy says
“Included in boardset are an input selector switch panel for rotary switch and RCA jacks, board for remote volume pot (various types), and dual rail dual monoblock PSU”
… BO is an acronym(?) for the remote volume pot board?
Thank you
@otto,
BO commonly refers to 'break-out' board. The Yarra, if memory serves, is supplied with 3 different sized, small BO boards design to accommodate different sized VC pots. The large ALPS and small ALPS styled - depending upon the user preference and what they have on hand, or prefer. They all use SIL plugs to connect to the pre-amp 'motherboard' using the same layout and spacing (obviously) required by the mobo.
The design of the Yarra did try and (and very well at that), to accommodate a plug-n-play approach to the fittings as well as the modular pre-amp daughter cards. Suited to allow the user to mix and match various components to their sonic liking or for better matching to downstream equipment. Brilliant!
BO commonly refers to 'break-out' board. The Yarra, if memory serves, is supplied with 3 different sized, small BO boards design to accommodate different sized VC pots. The large ALPS and small ALPS styled - depending upon the user preference and what they have on hand, or prefer. They all use SIL plugs to connect to the pre-amp 'motherboard' using the same layout and spacing (obviously) required by the mobo.
The design of the Yarra did try and (and very well at that), to accommodate a plug-n-play approach to the fittings as well as the modular pre-amp daughter cards. Suited to allow the user to mix and match various components to their sonic liking or for better matching to downstream equipment. Brilliant!
Have you had sound come out with other DB’s so the issue the Melbourne DB? Or this is a brand new system and no sound ever? Because it might be your connections on the main board.
As always, check to make sure the DB is getting power. Does DMM shows +/-v supply at the bolts labeled + and -?
Then turn source on and use volts AC and probe the input bolt on the DB. Is there signal in the tens to 100 mV rms range?
If no signal then it won’t play.
Check bias current of Melbourne across the resistors above the collector or below the emitter of the main output transistor.
As always, check to make sure the DB is getting power. Does DMM shows +/-v supply at the bolts labeled + and -?
Then turn source on and use volts AC and probe the input bolt on the DB. Is there signal in the tens to 100 mV rms range?
If no signal then it won’t play.
Check bias current of Melbourne across the resistors above the collector or below the emitter of the main output transistor.
