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Chip Amps Amplifiers based on integrated circuits

Toroid @ PE
Toroid @ PE
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Old 5th January 2005, 04:38 PM   #1
troystg is offline troystg  United States
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Default Toroid @ PE

Hi All-

Cross over thread from the SS forum.

http://www.partsexpress.com/pe/showd...number=129-090

It is a dual output, 5 amp toroid for 7 bucks!! + and - 40 volts for tube buffers and + and - 20 volts for LM38xx's.....

$7!!! Probably cost more to ship it. Joking....
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Old 5th January 2005, 04:50 PM   #2
BrianGT is offline BrianGT  United States
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Default Re: Toroid @ PE

Quote:
Originally posted by rabstg
Hi All-

Cross over thread from the SS forum.

http://www.partsexpress.com/pe/showd...number=129-090

It is a dual output, 5 amp toroid for 7 bucks!! + and - 40 volts for tube buffers and + and - 20 volts for LM38xx's.....

$7!!! Probably cost more to ship it. Joking....
Looks interesting... shipping for 1 is $8.08 and for 2 is $8.78 shipping.

I have a friend running an LM3875 amp with a 80vct transformer that I had laying around, but I wouldn't recommend it. I was suprised that the chip would run on rails a little over 50vdc, exceeding the numbers in the datasheet. be careful if you intend on trying it

This would work great for a leach amp, with 1 per channel. $22.78 shipped for 2 isn't bad at all.

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Old 5th January 2005, 04:53 PM   #3
troystg is offline troystg  United States
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Hi All-

I was suggesting the 20 volt section for the LM38xx chips.. Rectified to DC = 28 volt rails..

The 40 volt section would be good for other amps or tube stages...

Troy
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Old 5th January 2005, 05:10 PM   #4
chipco3434 is offline chipco3434  United States
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8 bucks to ship one???? The solution is to buy 8.


2 129-080 28V CT TOROIDAL TRANSFORMER $5.00 $10.00
6 129-082 14V CT TOROIDAL TRANSFORMER $5.00 $30.00
1 UPS-GroundTrac $13.16 $13.16

Brian... I ran out of time of parsing the 4780 thread. As sold, does your board implement parallel or bridged topology?

Also, I have a cigar box GC nearing completion. Looks pretty cool. Will send pics.
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Old 5th January 2005, 05:53 PM   #5
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by chipco3434
8 bucks to ship one???? The solution is to buy 8.


2 129-080 28V CT TOROIDAL TRANSFORMER $5.00 $10.00
6 129-082 14V CT TOROIDAL TRANSFORMER $5.00 $30.00
1 UPS-GroundTrac $13.16 $13.16

Brian... I ran out of time of parsing the 4780 thread. As sold, does your board implement parallel or bridged topology?

Also, I have a cigar box GC nearing completion. Looks pretty cool. Will send pics.
parallel. The main goal is for the LM4780 to be more suited for lower impedence speakers. The bridged configuration wouldn't be good at all with low impedence speakers. A bridged/parallel setup with 2 boards for 1 channel would be optimal if you are going for power.

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Old 5th January 2005, 10:17 PM   #6
jawbreak is offline jawbreak  United States
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Hey what does the 80V CT mean? 80 volts center-tapped? Sorry Im new to transformers.

Would two of these work for brian LM3875 mono block kit.

If I use the 20.2V rails and it has a current of 5.36A,
so 20.2 * 5.36 = 108.272VA which should be enough for each channel? I read somewhere the actual VA would be time 60%
so 108 * .60 = 64VA, 64watts per channels?

Is this correct? Thanks.
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Old 6th January 2005, 12:35 AM   #7
troystg is offline troystg  United States
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Hi-

One would be enough to drive a stereo pair of amps so two in mono configurations would be plenty.

As fo your calculations:

I believe "so 20.2 * 5.36 = 108.272VA" is correct.

I DON'T think "so 108 * .60 = 64VA, 64watts per channels?" is correct.

I think what you might have read is 108 * .60 = 64VA, which MAY be correct, but has nothing to do with "watts per channel".
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Old 6th January 2005, 02:05 AM   #8
jawbreak is offline jawbreak  United States
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DUH! Sold out

Anyone buy any extras and willing to part with 2
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Old 6th January 2005, 05:21 PM   #9
troystg is offline troystg  United States
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Yep sold out.

WAS A GREAT DEAL...

But gone now.
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Old 7th January 2005, 07:50 AM   #10
Fandu is offline Fandu  United States
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Is anyone sure of the rating on this transformer? All the specs say is that it's rated at 5.36A, it doesn't specify what that rating is for though. It could be:

40.4V * 5.36A = 216VA
or
80.8V * 5.36A = 432VA

Does anyone know??
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