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Old 27th December 2010, 07:48 PM   #671
wahab is offline wahab  Algeria
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Quote:
Originally Posted by osscar View Post
Tnx Wahab!

I myself still wonder - how much it is - 8W
its not sounding but singing amp
That s fairly enough for domestic use provided the speakers
have at least 90db/W/1M efficency, although, it works best
in a triphonic scheme with a 20W amp for the basses..
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Old 27th December 2010, 07:53 PM   #672
Root2 is offline Root2  United Kingdom
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Quote:
Originally Posted by masag1 View Post
My Friend Klaus did a very nice Pcb for me.

Look for the short signal traces!

Use a Silver Mica for feedback compensation, 1,5nF to 2nF, watch the scope.

You can tray to test Bulk Foil or Tantal-R or Riken Resistor in the feedback path, you can trimm the sound with the 220R resistor.

With kind regards

SAm
can't Sliver Mica be a little "Micro phonic" ?

Best Colin
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Old 27th December 2010, 08:33 PM   #673
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Beautiful work, Osscar!!!!!!!!!!!!!
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Old 28th December 2010, 07:35 AM   #674
masag1 is offline masag1  Germany
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Hi Colin,

I don't want to start a Cap discussion

The 8Watt is a nice amp, where everybody can play with parts substitution.

Did you you compared the sound of the 8 Watt with several setups?

The 8 Watt is not expensive, so you can build 2 stereo sets for comparism.

In the moment we do a new design, where we add a current source to the inputstage.
Matching of the j-fet would be easier, and only four sound relevant resistors.

Regards

SAm
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Old 28th December 2010, 10:56 AM   #675
Root2 is offline Root2  United Kingdom
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Quote:
Originally Posted by masag1 View Post
Hi Colin,

I don't want to start a Cap discussion

The 8Watt is a nice amp, where everybody can play with parts substitution.

Did you you compared the sound of the 8 Watt with several setups?

The 8 Watt is not expensive, so you can build 2 stereo sets for comparism.

In the moment we do a new design, where we add a current source to the inputstage.
Matching of the j-fet would be easier, and only four sound relevant resistors.

Regards

SAm
Dear Sam

No compliant about the design none, but I have tried Silver Mica in filters and I was trying to avoid other having the same problem, and that is all.

Just due care to my fellows on this site.

Regards Colin
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Old 28th December 2010, 11:57 AM   #676
WuYit is offline WuYit  Sweden
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Colin,
I would use polystyrene or polypropylene. Maybe its not even needed. Have you built Le Monstre?
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Old 28th December 2010, 12:08 PM   #677
masag1 is offline masag1  Germany
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@Wuyit

No polystyrene cap, polyprop is ok, but you have to try

You will need compensation cap over the 220R feedback resistor. There was always a peak on the squarewave signal.

With the 2SA1407/2SC3601 we could scale down to 1nF.

I have built more then 10 pairs of 8 Watt amps.

Regards
Sam
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Old 28th December 2010, 12:33 PM   #678
WuYit is offline WuYit  Sweden
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masag1,
I would try to avoid that capacitor, would rather reduce the resistor value from 220 to 100 Ohms (or more).
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Old 28th December 2010, 01:41 PM   #679
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Default Compared with LM1875 ?

[QUOTE=osscar;2412058]After a two-night listening, I can tell you something, compared with F5:

Thanks for your comparison with the F5.
I was curious. Have you compared it against the LM1875 ? levels have to be matched . You can even use low voltage mains hum as a signal source and measure the levels on both amps with a DMM. Quick and dirty way of doing this. You have to make sure you don't clip the 1875.

Can you please try this and let us know ?
Thanks.
By the way your LM1875 implementation looks great !
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Old 28th December 2010, 01:53 PM   #680
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by osscar View Post
Today Just finished my Le monstre, pots still don't delivered to me, so i soldered instead of pot to fixed resistors - for one channel 2x680R - works fine - bias 0.7A DC offset - in range of 10mV. Other channel - 2x 100R -bias around 0.7A , DC offset - 150mV , i will solder pots when received them.
Supply voltage around 13.6V with load.
Now will be listening tests.

Thanks to all DIYers from this thread - Lineup, Gaborela, Nezoi , and others who create PCB and explain things. And also thank you Mr. Hiraga

Inform you about sound later

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
Very tidy job again Oscar ..... Scope pics ? ...

Quote:
Originally Posted by osscar View Post
After a two-night listening, I can tell you something, compared with F5:

Monstre have more gain;
it is not as sharp as F5;
Detailed - like F5;
Bass - very good, but more rounded then in F5;
Microynamics - very good.
I really like the classical and instrumental music with this amp and it not so hot like F5.
Le monstre sounds good at very low levels also...

I am a bit confused - different they sounds, but at the same time the same in some way
I like electronic music with F5 and also Le monstre sounds very good.
In winter i will use F5 -in summer - Monstre


F5 is more than double the power i would have expected better dynamics , do you have anyway of testing your speakers impedance vs mag vs phase.

Last edited by a.wayne; 28th December 2010 at 01:55 PM.
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