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PostPosted: 09 Dec 2010, 18:08 
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Joined: 08 May 2009, 08:20
Posts: 918
Location: Duesseldorf, Germany
Hi and welcome!

Wow, an other great DIY project. Congratatulations! The project looks fantastic ;-).

Could you post some of your impressions about the sound?

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Cheers,
Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 09 Dec 2010, 22:23 
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Joined: 24 Jun 2010, 00:48
Posts: 788
Location: Christchurch, NZ
sampsulisami wrote:
clean, accurate, balanced sound.

More details please... :smoking:

1. Bass authority / control ?
2. Sound staging / imaging precision ?
3. Dynamics ?
4. Can it impart passion for music so you can listen for months/years ?
5. Warm, neutral or analytical sound ?

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Dinesh

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PostPosted: 10 Dec 2010, 17:13 
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Joined: 02 Sep 2008, 23:22
Posts: 103
Location: Australia
Nice build sampsulisami,

I like the case and the layout.

I have to say.... I cant help myself to say this... but add more capacitance in the Pi filter configuration..... it will make a big difference to dynamics.

The Rifa capacitors you chose are very good though.

other than that the build looks great.

-Dan.

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PostPosted: 10 Dec 2010, 17:25 
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Joined: 08 Dec 2010, 06:21
Posts: 13
hi.

-RMS 18W (8ohm speaker) and 36W (4ohm speaker)

-frequency response is stable/does not change 18hz-->30 000hz


my age is 20...which is why I do not have many years of listening experience...

this my thesis.


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Last edited by sampsulisami on 10 Dec 2010, 17:35, edited 1 time in total.

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PostPosted: 10 Dec 2010, 17:30 
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Joined: 08 Dec 2010, 06:21
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Dan wrote:
add more capacitance in the Pi filter configuration..... it will make a big difference to dynamics.

The Rifa capacitors you chose are very good though.

these capacitors are 2kpl 47 000uf... not it enough? how much more? twice?


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PostPosted: 12 Dec 2010, 11:30 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
In Dan's build of Jean Hiraga's "Le Monstre" he used a fully regulated supply with a total of 127,0000 uF capacitance per channel and a 500 VA.

In the original Jean Hiraga's "Le Monstre" article, 68,000uF per channel and a 160VA transformer were used.

So you are in the ballpark with 47,000uF.

Before you spend a lot of money and since this is a school project, you should calculate the ripple of your supply and also measure it. Then you can adjust your power supply to meet the noise level you want to acheive.

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 13 Dec 2010, 15:39 
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Joined: 08 Dec 2010, 06:21
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thanks comment. :)

my amp.... transformer is 2X18V (500VA)....

amplifier circuit operating voltage 20v


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PostPosted: 28 Jan 2011, 04:43 
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Joined: 08 Dec 2010, 06:21
Posts: 13
sine wave(930Hz) load 8ohm 11,99v~.... sine wave intersects the 12v~ after..

P=U²/R

U=11,99v~

R=8ohm

8 ohm load-> 11,99v~ ²/8ohm = 17,97W RMS

4 ohm load 11,99v~ ²/4ohm = 35,94W RMS


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PostPosted: 21 Feb 2011, 13:11 
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Joined: 14 Oct 2008, 17:35
Posts: 901
Location: Dartmouth, Nova Scotia
I LOVE IT!!!!!!!!! :blush: :P

It's sooooo shiny and clean with lots of heat conductive aluminum! That qualifies for being one of the nicer solid state Class A amplifiers I have seen.

Great job :up:

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My Mini 12AU7 Tube Preamp, Pioneer SX-D7000, JVC XL-V221BK, JBL L80T, DCM TF700


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PostPosted: 26 Feb 2011, 15:21 
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Joined: 26 Feb 2011, 15:02
Posts: 30
My PCB for my "Monstre".
The supply is in design: two 12V@63Ah batteries; 2kW PFC CCM, SMPS 310V/24V@10A/5V@2A, CV/CC Charger and SMPS 310V/2x14V@16A.
Attachment:
MONSTRE-AMP-PCB.pdf

More to come...


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