New M-dac power supply

[realysm42]

Excellent Martin, some facts are much appreciated...

I'm building suspense

I'll say no more until I've actually received and reviewed it

[MCRU]

Well I may not want to let it go as I am "burning" it in for you currently

I have these in the house currently:-

M-DAC
R-DAC
Bushmaster
Furutech Esprit
Teac just arrived (selling off 1/2 price at Richersounds)

Luckily I have enough PSU's to suit them all and the differences are quite amazing when all are played through the same source (SB Touch with enhanced digital output), I won't say which is best or worst as I am still evaluating and you can be the judge on the effect of the M-DAC PSU.

[bobbasrah]

I'm building suspense

I'll say no more until I've actually received and reviewed it

Not suspense necessarily, rather more a large pile of....conjecture....

Certainly sounds quite intriguing what David's supplied unit will bring to the party given the existing performance...

[realysm42]

Well I've not said anythign regarding it's performance yet, so I'm not sure about conjecture; I'm excited to see what it's capable of though, that's for sure!

[bobbasrah]

Well I've not said anythign regarding it's performance yet, so I'm not sure about conjecture; I'm excited to see what it's capable of though, that's for sure!

Nothing you said at all mate....

[realysm42]

Sure.

[Reid Malenfant]

Here the internal psu board schematic

I'd hardly call that or should I say those - precision regulators

Using a P channel device in a positive regulator & an N channel device in a negative regulator means that they will be slow in comparison to a regulator that acts like a source follower.

So they already have compromised regulation at higher frequencies & that's before going into any more detail.

That can very easily be bettered

[sq225917]

Those are just the pre-regs, there's a couple more local regs on the main pcb.



The schematic you're looking at if for the small pcb along the RHS edge.

[Reid Malenfant]

Ah, so I see Yes, they'd help

[sq225917]

I was speaking to John about it over the weekend and he's got a few more things in mind.

He's moved the kelvin sense point for one of the regs, and he's implemented a slightly revised design around some higher bandwidth op-amps with lower noise that he reckons pep things up a bit as well. There's a couple of further mods to two of the regs on the main pcb, different decoupling scheme and local gnd path. He's going to offer them as a package for people who currently have Mdacs.

He's going to ship a modded pcb over in a the next week or so and I'll do some back to backs. With the mdac removed from it's casework it should only take 20 seconds or so to swap main boards over which isn't going to be much worse than swapping IC's over between two dacs. Should be decent enough for some AB stuff.

Be interesting to see how much closer it comes to the Weiss.