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Chip Amps Amplifiers based on integrated circuits

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Old 27th May 2003, 10:05 PM   #11
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I like it! You've got plenty of elbow room, too!

Steve
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Old 27th May 2003, 10:21 PM   #12
Nuuk is offline Nuuk  United Kingdom
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Hi Carlos,

I'm not sure what happened but I posted a comment on your Gainclone and it doesn't seem to have come up!

I think that you have done a great job and there is plenty of room for mods too! I will be very interested to hear how they get on with your father's 4 ohm speakers.
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Old 28th May 2003, 01:27 AM   #13
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Default Congratulations Carlos!

Whenever anybody actually finishes a project that I have promised to do myself, I get down on myself for (sometimes) not having finished yet and (mostly) not having started at all.

Really, the silence is just everyone's envy. We wish that it was us, also. That is why Peter generates such silence and noise. The silence is from those of us who aspire. The noise is from those who can't quite believe it is true.

:)ensen.
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Old 28th May 2003, 02:50 AM   #14
palesha is offline palesha  India
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Congrates! How about posting schematic & pcb drawing. Give the component details so that other can get/learn something.
MP
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Old 28th May 2003, 04:16 AM   #15
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Default Re: Congratulations Carlos!

Quote:
Originally posted by purplepeople
Whenever anybody actually finishes a project... -snip-
1000 people talk about it.
100 people plan it.
10 people start it.
1 person actually finishes it.

Congratulations sir. Also, there is certainly plenty of room "under the hood" for later additions if you want.
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Old 28th May 2003, 04:49 AM   #16
rdunnit is offline rdunnit  United States
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Nice job man!!! I have done a couple of gainclones but haven't finished one yet. I am still in the design process(and probably always will be) because after seeing Peter's work I drool and work hard to match it.

But really it is nice to see the designs everyone has. I mounted my components on a small board as well, except I only used one board and I also mounted a thermal switch on the heat sink that closes at 117 degrees Farenheit to turn on a small fan until the switch reaches 92 degrees then it opens, turning the fan off.
The fan is powered by a small 12VDC wallwart that I had laying around. As of right now, I have everything mounted on the back of an unfinished pine "WELCOME" sign that I had in my computer/electronics room. Everything is just sitting around on the board and even though I used some old Allen-Bradley resistors and cheap electrolytic caps, it sounds pretty damn good.
I used 4.7 uF metalized poly capacitors for the input and a stereo 50 Kohm Bourns pot that I stole from an old Lightning audio car amplifier.

So all in all I have to say good work dude!
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Old 28th May 2003, 10:39 AM   #17
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Default 3 audiophiles 'till 3 am

Quote:
Originally posted by Nuuk
Hi Carlos,
I will be very interested to hear how they get on with your father's 4 ohm speakers.

Hi Nuuk,

Well...
Yesterday it was until 3 AM...
Me, my father annd my brother.
I connected my amp to the pre out of my father's AMC amp.
The Allisons played well, but if we pushed the volume past the middle position (very loud!) the woofers flapped!
Bonc, bonc!
Well, we pushed it hard!
Those woofers were repaired a year ago, because the foam surrounds had gone.
Maby they are not "as good as new"...
But the sound was good, with a bass or much better deffinition and impact than the AMC.
I like to call it "slam".
Then we tested with some old Tannoy Stratford that my father also has but doesn't use.
I never liked the sound of this speaker.
But for the first time I heard good bass from these speakers.
Treble is bad, almost non-existent.
Those old Tannoy compression tweeters...
Than I said: look, I can bet that the best speakers here are the ones you have in your bedroom.
He went and got those.
Very cheap but very good Tangent Model Three I brought from London some years ago.
They are 8 ohms/87db, and have a little 10cm woofer and a little plastic tweeter.
But we never thought that these minuscule speaker would fill the big room.
They did.
What a sound, this is it!
Bingo!
My father didn't want to believe what he was hearing.
But the deam speaker is excelent.
I bought them new in London, where I was in vacancies, some five years ago for around 100 Euros.
My father had asked me to bring some small speakers from London, and this is what I bought.
Does Tangent still exist?
They never had distribution here in Portugal.
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Old 28th May 2003, 02:18 PM   #18
Nuuk is offline Nuuk  United Kingdom
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Hi Carlos, I hope that you are not too tired!

I haven't tried 4 ohm loudspeakers but your results with the other speakers are similar to my own. The 22 year old Mordaunt Short Pageants I have tested with most have never sounded anywhere as near as good as they do driven by the Gainiclones!

And my new experimental full-range speakers also fill the room with sound - it's weird listening to this sound and looking at those tiny monoblocks and trying to believe that they are responsible for it!

I have just tried to find Tangent through a search engine but there is no trace of them. Richer Sounds who used to sell Tangent Speakers no longer list any of their models. Your father's speakers the M3's were very highly rated when they came out a few years back (as were the smaller M2's).
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Old 28th May 2003, 03:10 PM   #19
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Talking man, I'm tired

You don't imagine the pain it was to get up today at 7.30 AM and come to work.
Anyway, yes, Tangent speakers were very raved at that time.
I was in a Hotel near Oxford street, and I got the underground to west London and travelled some 50km to hear them and buy them (while my wife was at the theatre ).
Beautiful city, by the way.
I forgot to say that yesterday we managed to "see" the chip's protection circuit in action.
With the Allison speakers (4 ohm), playing at silly levels, at a certain time they lowered the volume continuously.
Up and down.
But this was just for testing, because we never listen to music at that volume.
If my speakers at home were 4 ohm, I would do my Gainclone different from what it is now.
Instead of 24 volts secondaries, I would use 22 volts.
And instead of LM3875s I would use LM3886s.
Looking at the graph, it seams to me the LM3886 is more tailored to work with 4 ohm speakers.
For 8 ohm speakers, ther LM3875 seams better.
You can't have it all.
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Old 28th May 2003, 05:19 PM   #20
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Talking elbow room, that's funny

Quote:
Originally posted by mr_ro_co
I like it! You've got plenty of elbow room, too!

Steve

This may grow in the future to a multi-channel amp.
And that's when I convince myself that multi-channel is the way to go.
I'm happy with stereo.
And it's hard to convince wives that you really need 3 more speakers in the room.
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