F5 power amplifier

[npapp]

Originally posted by Nelson Pass


The Oracle sees all, tells all.

1 It doesn't matter as much as you think it does.

2 Yes, and No.

Answers from the master chef himself. Thank you

Now I just need to find sinks to dissipate 160w per channel

[Nelson Pass]

Originally posted by npapp
Now I just need to find sinks to dissipate 160w per channel

I'm the Oracle, not a miracle worker.

[toufu]

Originally posted by Nelson Pass


I'm the Oracle, not a miracle worker.

Papa oracle, do you see me happy with an F5 in the near future?

[Sisyphism]

npapp,
You can get huge heat sinks in Switzerland.
They offer from 20mm up to 1000mm length.
I do not know much about the seller, but this PDF looks interesting:

http://www.elinter.ch/media/img/01%2...M-P215-77A.pdf

Perhaps you need two of them in full lenght?
Sure very expensive to USA, but who knows...

[Sisyphism]

Dear Oracle,
Does really no one like to explain how those thermistors should be calculated?
Post #4604
I'm confused, because you used two of them in your circuit from Power Supply First Watt F3 :
http://www.firstwatt.com/downloads/F...-manual-sm.pdf
Thanks for sharing.


I'm pretty sure you are not interested in this, but i miss something:
My Edit Button. Can i get some?

That would be enchanting.

Regards Sisyphism

[elviukai]

Originally posted by Nelson Pass


I'm the Oracle, not a miracle worker.

good sense of humor

[bobodioulasso]

Sisyphism,
According to the PDF file one cl60 works for a 300va/230v transformer.
The CL60 imeasures 10 ohms@25° and 0,5 ohm@2.5Amp
One for each transformer will work fine.
The one to ground is usefull too.

You cannot make a mistake if you follow the PDF.
Your prior schematic was right to my sense.


http://www.gesensing.com/products/re...asheets/cl.pdf

[AndrewT]

one CL60 works for 110/120Vac 300VA transformer.

For 220/240Vac use try two CL60 in series.

I would never expect a CL60 to drop to 0r5 with 2.5A passing on a 220/240Vac mains supply.
2.5A @ 230Vac ~600W passing into the primary of a 300VA transformer.

[bobodioulasso]

Post #4638 one CL60 works for 110/120Vac 300VA transformer. For 220/240Vac use try two CL60 in series.

Is not the PDF showing the opposite?
-one cl60 for 220v
-two cl60 for 110 v
I use one per 250va 220v transformer.
I never have blown any 1.25T fuse.

[Razorblade]

Hi all,

i gathered 90% of the parts for my F5 Monos only some of the Panasonic 3w resistors and the thermistors are missing but before i order the missing stuff from digikey i have some questions left, maybe you can help me out.

1. What digikey part number to choose for the 4.7k thermistors? They have like a gazillion different types avaible and i am getting confused here.

2. The power supply: I want to go full mono with one 330VA transformer per channel and C-R-C-R-C, but i still have problems choosing the right values for R, C will be 22.000uF 50V Nichicons.

So, in the original stereo f5 we have C-R-C, 30.000uF - 0.1175R - 30.000uF
Thats for stereo, my amps are mono so there will be only have the current flowing, so I can double the resistance to 0.22R and will still have the same voltage drop, since i want to go C-R-C-R-C i need to split up the resistance equal and end up with 22.000uF - 0.11R (2x0.22R 3W) - 22.000uF -(2x0.22R 3W) - 22.000uF per rail. Should give the same Voltage drop as the original supply and since 12W rating for the resistors is ok for a stereo amp i guess i should be on the safe side using 6W for my monos, , or did i oversee something fundamental?

Thanks for your help