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Old 11th November 2012, 01:26 AM   #2261
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Quote:
Originally Posted by Pato666 View Post
What if you use 4 or 5 or more 2200uF? that's better than one huge 10.000uF and works well for low range, I think.
paralleling them lowers the ESR (total).

(that's a good thing)
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Old 11th November 2012, 10:39 AM   #2262
AndrewT is offline AndrewT  Scotland
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Zimmer,
each mains transformer deserves it's own mains fuse.
Each 400VA running on 110/120Vac will likely need a T8A, or T10A to start repeatedly over a large number of years and avoid nuisance blowing.
Fit a soft start to each toroid. The same timer can pull in a double pole single throw relay. One set of poles shorting the resistor in the primary feed to one transformer.
Quote:
They continue to blow, when i switch the amp on. I guess the two 400va toroids use a lot of current initially. Even 6A fuses blow. I currently jumped the fuses......
AND put back in the mains fuse that you shorted out !!!
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Last edited by AndrewT; 11th November 2012 at 10:42 AM.
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Old 11th November 2012, 10:46 AM   #2263
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Quote:
Originally Posted by AndrewT View Post
Zimmer,
each mains transformer deserves it's own mains fuse.
Each 400VA running on 110/120Vac will likely need a T8A, or T10A to start repeatedly over a large number of years and avoid nuisance blowing.
Fit a soft start to each toroid. The same timer can pull in a double pole single throw relay. One set of poles shorting the resistor in the primary feed to one transformer.

AND put back in the mains fuse that you shorted out !!!
Hi Andrew,

Thank you for your reply. We run 230V here. I will install a soft start ASAP and put back the fuses....

Michael
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Old 11th November 2012, 10:51 AM   #2264
AndrewT is offline AndrewT  Scotland
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400VA/220Vac = 1.8A. You are probably on a 220Vac mains supply. But it varies a lot.
Use a T1.6A pr T2A for each 400VA with a soft start.
Without a soft start, probably T5A or T6.3A for each.
And the mains fuse to start both, without a soft start, would be around T8A to T12A.
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Old 17th November 2012, 07:34 PM   #2265
Stixx is offline Stixx  Germany
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Switzerland has 230V mains voltage since 1987 or so..
and when it's like Germany voltage varies maybe +- 2%.
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Old 18th November 2012, 12:17 PM   #2266
yassud is offline yassud  Indonesia
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I am Sorry, photo Gallery but it most discussions.

Regard,

Yassud
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Old 20th November 2012, 09:52 PM   #2267
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Quote:
Originally Posted by yassud View Post
I am Sorry, photo Gallery but it most discussions.

Regard,

Yassud
Have to agree! there a few members that like to blow there own trumpet!
Lets stick to piccies and forget about trying to get more technical than the last post,
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Old 27th November 2012, 07:00 PM   #2268
6L6 is offline 6L6  United States
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So what does one do on a cold day with an old dying amplifier, a pair of Chipamp.com boards and a well-stocked bits box? Make a chipamp, of course!

It will be put to use as the amp for my project bench.

Click the image to open in full size.

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Last edited by 6L6; 27th November 2012 at 07:02 PM.
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Old 3rd December 2012, 09:58 PM   #2269
Einric is offline Einric  United States
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Default LM4780 Dual Parallel

Here is my newly finished AudioSector LM4780 Dual Parallel kit.
I have used the "Snubberized" power supply with 17.2kF per rail.
The entire chassis was made from parts in my "scrap" bin.

It sounds very nice, even better than when the left channel was running stereo by itself.
Attached Images
File Type: jpg Front Finished.JPG (823.0 KB, 162 views)
File Type: jpg Inside Finished.JPG (830.6 KB, 293 views)
File Type: jpg Back Panel.JPG (869.1 KB, 273 views)
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Old 3rd December 2012, 10:53 PM   #2270
6L6 is offline 6L6  United States
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Einric - very nice! A clean layout.

I also like the wood.
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