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Chip Amps Amplifiers based on integrated circuits

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Old 31st October 2012, 01:08 AM   #611
bcmbob is offline bcmbob  United States
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Me Too !
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Old 31st October 2012, 09:16 AM   #612
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I have great news too, finally got the caps and almost finished the case, only the front panel is left now. Works fine, the case is barely warm (ambient is +27) after an hour of movies on moderate volume with a closed lid.

One board is soldered with Tackmans instead of smd part and shows 0.8mv offset. Other uses Vishay smd resistors and cement 0R47 (for testing purposes only) shows 4.5mv offset, still acceptable, though not sure what caused the difference.

Chip goes to solid aluminum plate 16x50x50 that is tightly attached to the case, thermal grease between them, no bolts used here

Remains of Kimber 4TC used from the boards to binding posts. Used CMC silver plated RCAs (actually didn't like them) with solid silver 0.3mm wire for the signal.

Will add 0.3-1mm aluminum shielding later between the boards and toroids.

What else to say, amp is dead silent and is my first diy PA! thanks to all guys here for helping me, especially Dario, AndrewT, Bob
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Last edited by dtses; 31st October 2012 at 09:20 AM.
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Old 31st October 2012, 09:20 AM   #613
atupi is offline atupi  Romania
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Great to hear that Dtses. You have a nice enclosure and also very pro pictures.
The two large capacitors looks a bit strange to me. What kind they are ?
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Old 31st October 2012, 09:24 AM   #614
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thanks!
Unfortunately this is the only lens I have now so looks a bit blurred, other pics are made with iphone
Caps are Panasonic 35x20mm, weird size for me as well, I ordered them from Germany, so hope that these are genuine.
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Last edited by dtses; 31st October 2012 at 09:27 AM.
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Old 31st October 2012, 09:28 AM   #615
atupi is offline atupi  Romania
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I see you are using 2x18v AC this gives you 25v after rectification theoretically. Dont you think your caps are on the limit on their working voltage ?
I'm always trying to use caps al least 5 v over the voltage.
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Old 31st October 2012, 09:55 AM   #616
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Guys, are you planning GB for final version of the amplifier?
If yes- when will it be (approx ) ?
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Old 31st October 2012, 10:10 AM   #617
bcmbob is offline bcmbob  United States
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That's one of the best uses of a small chassis I have seen. Classic simplicity !

Was interested to see if there was any interference/hum with the toroids being so close and parallel. Sounds like it worked just fine. Of course I think the braided leads are great and you have a super clean and efficient wiring layout.

Are you planning to include some bottom to cover convection ventilation? May not be necessary but wouldn't hurt.

Beautiful build and thanks for sharing.

P.S. Please post at least a link on the chipamp photo gallery.
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Last edited by bcmbob; 31st October 2012 at 10:12 AM.
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Old 31st October 2012, 01:23 PM   #618
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Quote:
Originally Posted by atupi View Post
I see you are using 2x18v AC this gives you 25v after rectification theoretically. Dont you think your caps are on the limit on their working voltage ?
I'm always trying to use caps al least 5 v over the voltage.
same rule for me. Unfortunately no space here for 40-50v caps. There were several alternatives to these PANAS that also fit the chassis - Elnas and Mallory, though I stayed with Panas more because of the price and that parcels from China should be waited for more than a month.
So I've got very close to 25VDC on them, 24.5-24.9VDC depending on the mains to be precise. Hope they could withstand that voltage for some time, alternatively I could always replace them later as there are options. Btw, I'm not planning to use the amp for many years, perhaps it would be sold later as I've already had an idea of ideal FE where four monos are placed in the same chassis (standard size now) and that would be a wonderful solution for biamping

Quote:
Originally Posted by bcmbob View Post
That's one of the best uses of a small chassis I have seen. Classic simplicity !
thanks for such a pleasant comment, Bob!

Quote:
Originally Posted by bcmbob View Post
Are you planning to include some bottom to cover convection ventilation? May not be necessary but wouldn't hurt.
there are no ventilation in this case at all! I know it's bad, but it feels hardly warm (chip, solid aluminum plate, both walls of the case) after a movies is played. Of course, I'll need more thorough and loud testing, but I was very surprised with these results. My plan is to add ventilation anyway, it would be done via laser by adding several long holes on both lids.

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P.S. Please post at least a link on the chipamp photo gallery.
will do once i finish case, the front panel in chrome is still to come.
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Old 31st October 2012, 02:53 PM   #619
AndrewT is offline AndrewT  Scotland
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you could buy 35V capacitors for 25+Vdc operation.
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Old 31st October 2012, 04:22 PM   #620
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Originally Posted by dtses View Post
I have great news too, finally got the caps and almost finished the case, only the front panel is left now.
Great!

I still think it's an extreme/borderline build but very well executed

I'll wait your listening impressions...

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Originally Posted by voxxonline View Post
Guys, are you planning GB for final version of the amplifier?
If yes- when will it be (approx ) ?
It depends on builders feedback and build rate...

So far I would say in the first 2013 quarter.
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