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First One - mosFET amplifier module

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bobo le chat

bobo le chat

Member
Joined 2006
Hello
Sorry, a car accident forced me to delay this project, I admire the professionalism of Lazzy, very nice work.
Best regards
Roger

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
edbk 2 (chassis)
metallicus69 2
scoutOne 4
quan 2
Greg Stewart 2
colesey 2 (chassis)
analogsa 4
Theodosis O. 4
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 (chassis)
JethroTull 2
stonehome 2 (chassis)
commstech 2
we417 2
hcbonfim 2
stormsonic 2 (chassis)
fishball79 4
Catal 2
Overkill Audio 7 (chassis)
touchdown 2
sebbyp 4 (chassis)
a333bt 2
flyboi 4
rellum 2
huibert34 2 (chassis)
tjencks 2
back 4
gusto142 2 (chassis)
julcat 2 (chassis)
taccodude 2
glt 2
 
Overkill Audio

Overkill Audio

Banned
Joined 2006
7 boards with 3 mono chassis

Hi Andrej,


I only need 3 mono chassis as the other 4 boards will be built into the back of my active speakers....
Also I would like to wait until you have tested all PS options and " the dust has settled" so to speak.....Once I build in the FO modules and install the speakers I can not risk any problems or changes....It would be messy!

I don't mind if I have to miss the first round of orders...June is fine for me as my speaker cabinets wont be ready till then.

Also, once again many thanks and congratulations for this fabulous breakthrough in real world amplifier design and performance.....Plus THE best Group buy R&D collaboration and organisation I have ever seen .....You are the man!



Lazy Cat said:
Hi to all GB members :wave2:

Here's the latest GB list, checked today from the start of this thread. ;)

According to the latest development I'm in a strong position to deliver First One modules and C1 Chassis only. Full kit mark on your offers will be transformed into First One modules and C1 Chassis. ;)

Power supplies whether SMPS or classic linear have to be ordered by each GB member individually. Good luck with SMPS suppliers. :xfingers:



luca 4
danny_66 2
woofertester 4
rainerco 2
pinnocchio 4
jokari69 2
mksung 2
ZZoran 2 (Connex SMPS2000R)
Edgar 2
Eric06 2
kimon 2
maxidcx 2
edbk 2 (full kit)
bobo le chat 2
metallicus69 2
scoutOne 4
quan 2
Greg Stewart 2
colesey 2 (full kit)
analogsa 4
Theodosis O. 4
chunek 2
CaféNoir 4 (chassis)
Nikitas 2 (full kit)
meanman1964 2
jeremysk 2
Dane 2
mikvous 2 (full kit)
PreSapian 2
coolewater 2
edionysus 2 (full kit)
jaggel 2 (full kit)
fredlock 2
HiroPro 2 (full kit)
Turbon 2 (full kit)
r8833 2
androa76 2 (full kit)
JethroTull 2
stonehome 2 (full kit)
commstech 2
we417 2
hcbonfim 2
stormsonic 2 (full kit)
fishball79 4
Catal 2
Overkill Audio 7 (chassis)
touchdown 2
sebbyp 4 (chassis)
a333bt 2
flyboi 4
rellum 2
huibert34 2 (full kit)
tjencks 2
back 4
gusto142 2 (full kit)
julcat 2 (full kit)

Offers will be send to your PM today. :up:
Click to expand...
 
Lazy Cat

Lazy Cat

Member
Joined 2007
Here 1. and 2. May are holidays, so I can't check postal shipment costs to be 100% sure. Since I want to prepare offers with lowest shipment costs and don't want to correct later, it would only take double time and work, so it has to be check personnally, postal price list enables few options. :)
 
T

Theodosis O.

Member
Joined 2006
2 instead of 4. Thanks


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
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 (chassis)
JethroTull 2
stonehome 2 (chassis)
commstech 2
we417 2
hcbonfim 2
stormsonic 2 (chassis)
fishball79 4
Catal 2
Overkill Audio 7 (chassis)
touchdown 2
sebbyp 4 (chassis)
a333bt 2
flyboi 4
rellum 2
huibert34 2 (chassis)
tjencks 2
back 4
gusto142 2 (chassis)
julcat 2 (chassis)
taccodude 2
glt 2
 
S

shanachai

Member
Joined 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 :)
 
Lazy Cat

Lazy Cat

Member
Joined 2007
shanachai said:
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 :)
Click to expand...

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 ;)
 
Lazy Cat

Lazy Cat

Member
Joined 2007
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
 
J

jaggel

Member
Joined 2012
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
 
stormsonic

stormsonic

Member
Joined 2008
Black for me :D

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
 
Lazy Cat

Lazy Cat

Member
Joined 2007
SMPS shootout - Hypex strikes back, HARD !

Hi GB members :wave2:

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. :wiz:

Have fun building the First One amplifiers. :cheers:
 

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