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First One - mosFET amplifier module

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#2,788
maxidcx said:
Hi LC
any news about S version ?
I couldnt wait so I ve just order M version, but later I absolutely want to test biamping with 2 S. Any chance you could already post the drill plan for the S version please ?
Click to expand...

I don't want to rush on this one, since I'm in the middle of testing of S and L prototypes, just before finishing PCB. After PCB is sent to production it's all too late for any correction to take place, so momentarily great care is taken to the last detail.


maxidcx said:
in order to test I have only ordered 1 hypex 1200A400 and then I was thinking about why the hell it would be so much better with dual psu. In fact its all about the problem of the ground current return and the fact that wires are resistor and then a voltage is showing up. But to avoid any cross talk or interraction between signal and reactive load we just need a clean Star and connect the signal ground to the star point instead of the "in-" of the FO, right?? let see;
Click to expand...

For me there should be only one GND point to which analog signal is referenced and that is at I/V conversion inside DAC or at MM/MC pick-up. After this, all along audio chain to its end at speakers, any L & R GND short connection will introduce some new artifacts, interference currents and distortions not common to original signal in DAC or other analog source. So we need to avoid doing this and that is only possible with monoblocks or strict dual-mono amplifiers. In this way we get best stereo image with depth and resolution unmatched to common GND classic stereo amplifier.


maxidcx said:
At the moment I m using a dual mono smps+classD amp from Audiopower (each 0V only connected to signal ground input) and the result is excellent
http://www.gopix.fr/image-E88F_56C0B9D5.jpg
but its too brilliant in the highs (may be thd)... I hope FO will solve that and that FO+Hypex will give the same clean and powerfull bass as this DPA400. Cheers
Click to expand...

Me hope you'll be happy. :cheers:
 
#2,789
Lazy Cat said:
Jay, I don't know what are you talking about here?! This is commercial part of the forum, therefore your assumptions have nothing in common with First One v1.4 amplifier since you don't own one, nor know anything about its schematics. Please post your theoretical philosophy in some other threads in Solid state part of the forum, not here.
Schematic of FO v1.4 is light years ahead of what you know regarding CFA (FO v1.2), so please take my words seriously.

Regards, L.C.
Click to expand...

quote: FO v1.4 is light years ahead of what you know regarding CFA (FO v1.2), so please take my words seriously.

🙄🙄🙄🙄🙄🙄🙄🙄
 
#2,791
Cresnet said:
Conducting some tests..

Deadly silent, Zero Noise, Zero Hum, even when nothing is connected to its input.

Sound is just superb, clean and clear mid / highs. Deep and low BASS. Total control of the speaker!

great work LC
Click to expand...

Looks like Flukeland.

About the vent. When i was calibrating the amp DC offset and bias they were floating quite quickly. I did not understand why. Later i discovered that my lung exhalations into diamond buffer termally changed the transistor sweet spot. When corrected the amp was stable.

For best sound quality you really need stable enviroment for the amps front end. And then magic happens.
 
#2,792
hose4 said:
Looks like Flukeland.

About the vent. When i was calibrating the amp DC offset and bias they were floating quite quickly. I did not understand why. Later i discovered that my lung exhalations into diamond buffer termally changed the transistor sweet spot. When corrected the amp was stable.

For best sound quality you really need stable enviroment for the amps front end. And then magic happens.
Click to expand...


Yes, I am not using a FAN at all, sound is just big, when its hot!

So I leave it hot!
 
#2,793
Hi Cresnet,

I believe it's your own power supply in the background. If it's a great match with the FO you should create a thread to talk about it. Not many choices out there when it comes to high performance bipolar supply that can be used for Audio. More trusty manufacturer like you are most welcome.

BR,
Eric
 
#2,795
hose4 said:
Looks like Flukeland.
Click to expand...

Probably The Best First One measuring calibration equipment on the :earth:

hose4 said:
For best sound quality you really need stable enviroment for the amps front end. And then magic happens.
Click to expand...
First One's magic happens with just the right heat sinking at +/- 60 V/280 mA/45° C :wiz:

FYI, all bridge structures whether it is Wheatstone, Maxwell, Kelvin, Wien, ... , Diamond or just a plain one, needs stable environment to be able to set it to equilibrium. :cloud9:
 

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#2,796
e_fortier said:
Hi Cresnet,

I believe it's your own power supply in the background. If it's a great match with the FO you should create a thread to talk about it. Not many choices out there when it comes to high performance bipolar supply that can be used for Audio. More trusty manufacturer like you are most welcome.

BR,
Eric
Click to expand...

Alleged power supply that would beat SMPS1200A400 will be the winner for my :hbeat:


e_fortier said:
Hi LC

Is the PSRR of FO 1.4 much better than 1.2 ?

BR,
Eric
Click to expand...

Yes. There are plenty housekeeping parts taking care of this. :nod:

Again, FO v1.4 is completely different amp, brief look to the photos tells everything, like someone has said before new version should more appropriately be v2.0
 
#2,797
e_fortier said:
Hi Cresnet,

I believe it's your own power supply in the background. If it's a great match with the FO you should create a thread to talk about it. Not many choices out there when it comes to high performance bipolar supply that can be used for Audio. More trusty manufacturer like you are most welcome.

BR,
Eric
Click to expand...


Yes, that's my own power supply running the FO module perfectly, I am also in the design stage of the new 1000W SMPS also.

I only have 4 volts drop at 225W output @ 4R dummy load @ 1Khz Sine wave!

Thank you for your trust.
 
#2,798
Fo v 1.4 feed-back

Lazy Cat said:
Probably The Best First One measuring calibration equipment on the :earth:


First One's magic happens with just the right heat sinking at +/- 60 V/280 mA/45° C :wiz:

FYI, all bridge structures whether it is Wheatstone, Maxwell, Kelvin, Wien, ... , Diamond or just a plain one, needs stable environment to be able to set it to equilibrium. :cloud9:
Click to expand...


-----------------------------------------------------------------------------------------
Hello,

Just Few word to tell the fo v 4 is the best amp i ve ever heard.previously i had hypex ucd 180 the hypex ncore then fo v 1.2.

The 4 version is better than all hypex amp and than 2 version.
More transparency
More bass and détails...


I use a linear psu that gives much more results than the hypex ncore psu.

I know that lazy cat thinks the opposite but the thrue is so.


Congratulations lazy cat for your amazing job,

When. Do you release a 5 version...,,


Laurent
 
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