This is a very interesting matter. One of the things I was planing to build was a PC-high end dac, and was wondering if a high end PC power supply could work well with a dac. After all PC psu´s gives us 12v 5v and 3.3v lines, that can be usefull for audio.
Also there is the fact that GAN-fet are begining to be seen on the highest end power supplies, and those are supposed to get very very little ripple.
I have complete faith in the SMPS power supply - especially if Nelson does......
I built an amazing low-noise MC phono stage, designed by Wyn Palmer over at Audiokarma - and it was super-quiet. It used either this Meanwell SMPS supply (or one very similar). Wyn was impressed with the specs of this supply enough to use it for such an application
I built an amazing low-noise MC phono stage, designed by Wyn Palmer over at Audiokarma - and it was super-quiet. It used either this Meanwell SMPS supply (or one very similar). Wyn was impressed with the specs of this supply enough to use it for such an application
A linear PSU that is either regulated or has a capacitance multiplier will have about -50dB less 60Hz noise than a typical CRC. So that’s about —100dB to -110dB. Even shunt regulated supplies cannot get this low. I have not seen a regulated linear supply that can handle tens of amps have -130dB peak at 60Hz.
Attachments
A possible SMPS for a positive/negative rail supplied amplifier:
CONNEX SMPS300REh Power supply Module 300W +/-30V - Audiophonics
CONNEX SMPS300REh Power supply Module 300W +/-30V - Audiophonics
The new VFET amp has features in place to perform at a high level with a single SMPS power supply. In addition to the DC inlet filter, the input cards and the output stages have local 1000 uF power decoupling capacitors to improve channel separation.
That doesn’t mean that I won’t eventually build a dual mono linear PSU for it. I’m just funny that way. It does mean that the external linear supply will need to be a top of the line implementation to have a fair chance of letting the amp sound better. So, big and heavy, and full of AC line voltage. Something very similar to what I did for my F6.
That doesn’t mean that I won’t eventually build a dual mono linear PSU for it. I’m just funny that way. It does mean that the external linear supply will need to be a top of the line implementation to have a fair chance of letting the amp sound better. So, big and heavy, and full of AC line voltage. Something very similar to what I did for my F6.
It's done,all buttons pushed
I am one of the undeserving but lucky few from the bottom of the barrel, and trust me I could not be more surprised when I saw that my number was picked.
But before everyone more deserving start loosing it, I have donated to the HiFi community for the better part of 30 years, and I think it is safe to say that Peter Walker owns my left kidney and Leif Ernstsen the right one.
So fear not, this amp will live a rich and full life together with other Pass designs, quad amps, carver, dynamic precision etc.
As a teaser for myself I tinkered with some shelf ware and put together a TL speaker that I think will fit this little beauty perfect, aiming for +95dB in real life with AMT in the top, Audax PR17M0 in the middle and most likely Eminence deltalite dealing with the low end.
Anyhow, this was mostly written to spread some hope that even lurkers stand a chance, and at least this one knows what a special opportunity this is and will make the most of it.
Best of all is that fedex promisied that I get my hands on the chassie before end of business Monday, what a great start to a week.
Thanks to Nelson, Jason and everyone else whom made this possible.
Chris
I am one of the undeserving but lucky few from the bottom of the barrel, and trust me I could not be more surprised when I saw that my number was picked.
But before everyone more deserving start loosing it, I have donated to the HiFi community for the better part of 30 years, and I think it is safe to say that Peter Walker owns my left kidney and Leif Ernstsen the right one.
So fear not, this amp will live a rich and full life together with other Pass designs, quad amps, carver, dynamic precision etc.
As a teaser for myself I tinkered with some shelf ware and put together a TL speaker that I think will fit this little beauty perfect, aiming for +95dB in real life with AMT in the top, Audax PR17M0 in the middle and most likely Eminence deltalite dealing with the low end.
Anyhow, this was mostly written to spread some hope that even lurkers stand a chance, and at least this one knows what a special opportunity this is and will make the most of it.
Best of all is that fedex promisied that I get my hands on the chassie before end of business Monday, what a great start to a week.
Thanks to Nelson, Jason and everyone else whom made this possible.
Chris
So for +/- you hook the + terminal from one to the - terminal of the other?
Seems that you would hook the 2 - terminals together ....
Question from a non-technical type person.
Will playing a signal through the amp before the VFets have reached their operating temperature shorten the life the VFets, or harm them in any way?
My amp will be doing double duty, for music and for TV for my kid.
When doing TV duty, there's no getting a 4 year old to wait for more than a minute before the show has to start.
TIA
Will playing a signal through the amp before the VFets have reached their operating temperature shorten the life the VFets, or harm them in any way?
My amp will be doing double duty, for music and for TV for my kid.
When doing TV duty, there's no getting a 4 year old to wait for more than a minute before the show has to start.
TIA
This only works if the negative terminal is isolated from the earth ground. Which I think it is. I can check the Mean Well 24v brick I have. I have done this with the 24v 5A LED lighting SMPS on the M2. It worked like a champ. Very low noise and the hum went away.
Plus to minus forms the common 0v (analog ground).
Just checked. The earth ground is indeed isolated from the negative output (and positive output of course). This is a Mean Well GST60A24-P1J. 24v 2.5A SMPS “brick”.
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I should maybe have posted here Sony VFET Amplifier Part 2 as I intended to propose the use of this SMPS for a push-pull power amplifier like the originals Sony V-FET of NP.
I’ve used both Connexelectronic and Micro-Audio. The former was not anywhere near as quiet as the latter.