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First One - mosfet amplifier module
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Old 2nd May 2014, 03:45 PM   #631
shanachai is offline shanachai
diyAudio Member
 
Join Date: Apr 2014
Hi Lazy Cat and all,

This is my first post in the community so your help would be much appreciated in reaching a decision.

My goal is to build an integrated amplifier. I am leaning seriously towards FO.

Am I correct to assume that I need:

One PCB module per channel (i.e. 2 FO modules)
An SMPS (most probably the one from Connext with the Rubycons)
One stereo chassis.

Correct?
What other components will I need to build an FO integrated?
Are the FO PCBs the power amplification section only? Will I be needing a pre-amplification section?

Many thanks in advance.

P.S. If I may say so: I may be totally new in the DIY, but I can judge if someone is methodical, pays attention to detail, and has a good head on his shoulders.
Lazy Cat, kudos, really well done
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Old 2nd May 2014, 04:17 PM   #632
sebbyp is offline sebbyp  United Kingdom
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Join Date: Aug 2011
Location: London
Can I switch two modules and no chassis.

I would prefer to see the different options available around chassis, it also sounds like there will be plenty of modules around so I can buy more later.
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Old 3rd May 2014, 12:49 AM   #633
Overkill Audio is offline Overkill Audio  United Kingdom
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Join Date: Oct 2006
Default Just 3 mono chassis, all black.

Hi Andrej,

Yes just 3 black mono chassis.
7 FO boards....4 will be built into active speakers, 3 will go into the mono chassis.
Thanks
Derek.
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Old 3rd May 2014, 01:46 PM   #634
Lazy Cat is offline Lazy Cat  Slovenia
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Join Date: Sep 2007
Quote:
Originally Posted by shanachai View Post
What other components will I need to build an FO integrated?
Are the FO PCBs the power amplification section only? Will I be needing a pre-amplification section?

Many thanks in advance.

P.S. If I may say so: I may be totally new in the DIY, but I can judge if someone is methodical, pays attention to detail, and has a good head on his shoulders.
Lazy Cat, kudos, really well done
Thanks for kind words shanachai

First One is power amplifier module with input impedance 10 kOhm and 1,5 Vrms input sensitivity for full power output.

Preamplifier is needed to switch between the inputs - input selector and to have at least output buffer - volume control. It can have 0 dB or + 10 dB voltage gain too, depending to your source's output level.

My suggestion: RelaiXedSMD -- DIY balanced pre-amplifier
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Old 3rd May 2014, 01:49 PM   #635
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by sebbyp View Post
Can I switch two modules and no chassis.

I would prefer to see the different options available around chassis, it also sounds like there will be plenty of modules around so I can buy more later.
Yes, I will update GB list. Wait and see and decide then, no problem.
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Old 3rd May 2014, 01:50 PM   #636
Lazy Cat is offline Lazy Cat  Slovenia
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Quote:
Originally Posted by Overkill Audio View Post
Hi Andrej,

Yes just 3 black mono chassis.
7 FO boards....4 will be built into active speakers, 3 will go into the mono chassis.
Thanks
Derek.
Ok, so I'll correct to 7 FO only.

Mono chassis you can order later when it will be available.
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Old 3rd May 2014, 03:42 PM   #637
Lazy Cat is offline Lazy Cat  Slovenia
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Join Date: Sep 2007
Exclamation First One GB list update

luca 4
danny_66 2
woofertester 4
rainerco 2
pinnocchio 2
jokari69 2
mksung 2
ZZoran 2
Edgar 2
Eric06 2
kimon 2
maxidcx 2 (chassis black)
edbk 2 (chassis)
metallicus69 2
scoutOne 4
quan 2
Greg Stewart 2
colesey 2 (chassis)
analogsa 4
Theodosis O. 2
chunek 2
CaféNoir 4 (chassis)
Nikitas 2 (chassis)
meanman1964 2
jeremysk 2
Dane 2
mikvous 2 (chassis)
PreSapian 2
coolewater 2
edionysus 2 (chassis)
jaggel 2 (chassis)
fredlock 2
HiroPro 2 (chassis)
Turbon 2 (chassis)
r8833 2
androa76 2
JethroTull 2
stonehome 2 (chassis)
commstech 2
we417 2
hcbonfim 2
stormsonic 2 (chassis)
fishball79 4
Catal 2
Overkill Audio 7
touchdown 2
sebbyp 2
a333bt 2
flyboi 4
rellum 2
huibert34 2 (chassis)
tjencks 2
back 4
gusto142 2 (chassis)
julcat 2 (chassis)
taccodude 2
glt 2
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Old 3rd May 2014, 08:39 PM   #638
jaggel is offline jaggel  Greece
diyAudio Member
 
Join Date: Oct 2012
Location: Athens
I also changed my chassis to black...

luca 4
danny_66 2
woofertester 4
rainerco 2
pinnocchio 2
jokari69 2
mksung 2
ZZoran 2
Edgar 2
Eric06 2
kimon 2
maxidcx 2 (chassis black)
edbk 2 (chassis)
metallicus69 2
scoutOne 4
quan 2
Greg Stewart 2
colesey 2 (chassis)
analogsa 4
Theodosis O. 2
chunek 2
CaféNoir 4 (chassis)
Nikitas 2 (chassis)
meanman1964 2
jeremysk 2
Dane 2
mikvous 2 (chassis)
PreSapian 2
coolewater 2
edionysus 2 (chassis)
jaggel 2 (chassis black)
fredlock 2
HiroPro 2 (chassis)
Turbon 2 (chassis)
r8833 2
androa76 2
JethroTull 2
stonehome 2 (chassis)
commstech 2
we417 2
hcbonfim 2
stormsonic 2 (chassis)
fishball79 4
Catal 2
Overkill Audio 7
touchdown 2
sebbyp 2
a333bt 2
flyboi 4
rellum 2
huibert34 2 (chassis)
tjencks 2
back 4
gusto142 2 (chassis)
julcat 2 (chassis)
taccodude 2
glt 2
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Old 3rd May 2014, 10:05 PM   #639
stormsonic is offline stormsonic  Slovenia
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Join Date: Aug 2008
Black for me

luca 4
danny_66 2
woofertester 4
rainerco 2
pinnocchio 2
jokari69 2
mksung 2
ZZoran 2
Edgar 2
Eric06 2
kimon 2
maxidcx 2 (chassis black)
edbk 2 (chassis)
metallicus69 2
scoutOne 4
quan 2
Greg Stewart 2
colesey 2 (chassis)
analogsa 4
Theodosis O. 2
chunek 2
CaféNoir 4 (chassis)
Nikitas 2 (chassis)
meanman1964 2
jeremysk 2
Dane 2
mikvous 2 (chassis)
PreSapian 2
coolewater 2
edionysus 2 (chassis)
jaggel 2 (chassis black)
fredlock 2
HiroPro 2 (chassis)
Turbon 2 (chassis)
r8833 2
androa76 2
JethroTull 2
stonehome 2 (chassis)
commstech 2
we417 2
hcbonfim 2
stormsonic 2 (chassis black)
fishball79 4
Catal 2
Overkill Audio 7
touchdown 2
sebbyp 2
a333bt 2
flyboi 4
rellum 2
huibert34 2 (chassis)
tjencks 2
back 4
gusto142 2 (chassis)
julcat 2 (chassis)
taccodude 2
glt 2
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Old 4th May 2014, 01:22 AM   #640
Lazy Cat is offline Lazy Cat  Slovenia
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Join Date: Sep 2007
Lightbulb SMPS shootout - Hypex strikes back, HARD !

Hi GB members

As promised few days ago, just before deliveries started, me and two competent audio friends performed First One SMPS's AB testing today.

Three First One amplifiers on the test, each one equipped with different power supply: first with Hypex SMPS1200A400, second with Audio Power DPS-500/63 and third with Connex SMPS2000R.

Variety of music material selection from classical music, blues, rock, to electronic. We picked five diverse tracks for testing.

AB comparison started between two regulated SMPS-s: Connex and Audio Power. It was not really hard to recognize better, since bass was really on a weak side of Connex, probably the reason lies in a single SMPS2000R for both amp's channels, nevertheless the soundstage was narrow, instruments weakly presented, thin bodies, no real feeling of involvement into the music. DPS-500/63 were in dual mono configuration, meaning one per channel. Transparancy and details resolution was very similar but the bass was one step ahead over the Connex. Still no real musical involvement presentation here, sound more or less sticked to the speakers, instruments with weak bodies, sounstage not well formed. From both regulated SMPS we got an impression that the problem lies in voltage regulation principle, too much interfering in audio signal is probably the worst thing it could happen from amp's power supply.

After half an hour of mental pause, test continued between Hypex SMPS1200A400 and Audio Power DSP-500/63. First we listened to DPS-500/63, musical impression stayed very much the same as it was in the first session. Weak presentation left us more or less cold, music is simply too thin, uninvolving.

Hypex's turn then settled the things where they should belong, suddenly real music in the room. It was imediately clear to all of us who's having magic stick in its sleeve. SMPS1200A400 shocked us with music so real that others two seemed like that there was something broken in them. Hypex presented bass so low and strong that our jaws just dropped for a while, dense wall of air moved with lowest possible frequencies we could still hear, still with ease. Soundstage completely another story from previous contenders, no speakers in the room only musicians and instruments, this time with fully developed bodies, atmosphere of a recording stage, whether real or artificial, presented in full scale. SMPS1200A400 puts the First One amplifier in the first league of power amplifiers no matter the price level.

My suggestion to all GB members would be, of course if you want to get the most out of the First One amplifier, buy Hypex SMPS1200A400 power supply, normally one SMPS per First One module.

Have fun building the First One amplifiers.
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