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Old 11th January 2006, 07:10 PM   #1
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Default 6 monoblocks finished

My 6 monoblocks are finally finished

They are DC coupled LM3886 inverted amps with gain of 17,4 and feedback servo.
Supply for each of this amps is made of one 200VA 2x28V toroid transformer and 2 LM338T regulators. Before each regulator there is 3x2200uF + 470nF of capacitance, and after regulators 47nF near the regulator and 1000uF + 100nF by the LM3886 on each rail.
On regulator boards I left space for the snubber network, but tweaking will have to wait until I get to know the sound of this amps a little better.
I will use them for triamping my unfinished diy speakers.

I haven't had too much time for listening this amps yet, but in this little time I noticed that bass is phenomenal. It is deep and strong, but in the same time very well controlled with great dynamics. The highs are very detailed. Sound of this amps is little more opened than the of the last ones I had which were based on TDA7293.

More serious listening will have to wait until I finish speakers and preamp with active crossovers for them.
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Old 11th January 2006, 07:17 PM   #2
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More pictures
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Old 11th January 2006, 07:27 PM   #3
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And some more:
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Old 11th January 2006, 07:29 PM   #4
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The inside
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Old 11th January 2006, 07:29 PM   #5
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Those are some very nice looking amp!

How will you use them?
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Old 11th January 2006, 08:04 PM   #6
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At first I intended to triamp my new 2-way loudspeakers with them, but now I think I will go biamp because they drive 4 ohms with such ease, and they get just slightly warm even after long time full power listening. So now I have to think of a way to use the 2 spare amps I will have.

Speakers in the picture are closed box Q=0,7 2-way system with Westra XW165-1368 midbasses

http://www.elektro-akustik-labor.de/...W-165-1368.pdf

and Seas 25TFFC (H519) tweeter.

http://www.seas.no/seas_line/tweeters/H519.PDF

The first step now that amplifiers are finished is to finish this loudspeakers so I can finally start to listen some music because I gave my old speakers to my dad few days ago for his resthouse in hills so I now have nothing I can connect to outputs of this amps
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Old 11th January 2006, 08:24 PM   #7
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One more pic of the inside:

The box of the amp is made from 10mm MDF painted in black, except the front panel which is 22mm MDF veneered in padouk and the sides which are made of pear tree.
The amp is completely silent with no input signal present, and I can't hear any hum by putting my ear near the speakers.
The regulated supply works so fine that I can't measure any deviation in output voltage of regulators even at full power bass attacks.
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Old 11th January 2006, 08:31 PM   #8
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Picture of one of the regulator boards:
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Old 11th January 2006, 08:59 PM   #9
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Very nice. You fall into the category 'Fearless Amplifier Builder'.
I admire your courage to finish all six of them in a proper way.

/Hugo
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Old 11th January 2006, 09:53 PM   #10
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Thanks, Netlist !

Quote:
I admire your courage to finish all six of them in a proper way.
It all went very smoothly until I made 5 amps, and started to build the last one. Then I got nervous asking myself: When will this all be over ? I can't take it any more ! I thought I'll never finish them. Making so many amplifiers at once was a big bite and a great test for my nerves.

But now, just looking at that array of amps makes me forget all my troubles.
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