F5 power amplifier - Page 468

nicoch58 · 31st July 2009, 12:53 PM

good point ! plus advantage to put near the speakers with short cable

nicoch58 · 31st July 2009, 12:55 PM

two trafo, small space, a lot crossotalk and eddycurrent

bobodioulasso · 31st July 2009, 12:56 PM

Quote:

Originally posted by nicoch46
I joke I mean that trafo will run hotter

any one can report what gain in sound with dual mono psu ??

or at last one trafo and dual mono cap/diode......

A normal F5 channel draw 25v x1.3A x 2halves = 65w

The stock F5 (http://www.6moons.com/audioreviews/firstwatt7/f5_2.html)

works with a 300va trafo which is 150va per channel

One channel supplied at +/-20v dc and biased at 1.3amp will draw

20v x 1.3A x 2 = 52w

120 va per channel is ok. even without lowering the bias.

If you are afraid, you can start with 1A bias

20v x 1 x 2= 40w your trafo is 3 times this power.

AndrewT · 31st July 2009, 01:00 PM

Quote:

Originally posted by labjr
Are you saying that separate cases make a larger difference than using separate transformers?

I cannot confirm that.
Just that monoblocks are always better sounding.

nicoch58 · 31st July 2009, 01:01 PM

thanks a lot , as I need a buy two 300va for my Erno amp ,4 are too much money

reuse are eco friendly

nicoch58 · 31st July 2009, 01:11 PM

nicoch58 · 31st July 2009, 01:26 PM

I prefear use franch r-core trafo and FR ,girl too

Razorblade · 1st August 2009, 02:27 PM

Hey,

since i am building two F5 Monos at the moment, can anybody help me out with some questions regarding the power supply?

I have already posted it here

two pages back

For example: in spice simulation i get a power dissapation of ca. 100mw when using 0.15 Ohm resistance in a crcrc configuration, wouldnt 1 3w resistor be enough then?

AndrewT · 1st August 2009, 03:38 PM

what would be the peak current through the 0r15 if the speaker load demands 20Apk?
Most of that peak demand will be met by the last cap in the chain.
What percentage of rated dissipation would you aim for in the or15 for transient demands and continuous demands?

brianco · 4th August 2009, 05:33 PM

Can any Uk or Euro member recommend a supplier for the Power Supply caps and inductor coils. I have searched and other than a few difficult to understand sites can find little suitable. I would naturally like to get both from the same source as a single order.

I am also looking for adequate heatsinks for this amp and am having similar trouble in finding well specified items in small quantity.

Many thanks for any replies.

Brian

31st July 2009, 12:53 PM	#4671
nicoch58 diyAudio Member Join Date: Oct 2004	good point ! plus advantage to put near the speakers with short cable __________________ Sic58

31st July 2009, 12:55 PM	#4672
nicoch58 diyAudio Member Join Date: Oct 2004	two trafo, small space, a lot crossotalk and eddycurrent __________________ Sic58

31st July 2009, 01:01 PM	#4675
nicoch58 diyAudio Member Join Date: Oct 2004	thanks a lot , as I need a buy two 300va for my Erno amp ,4 are too much money reuse are eco friendly __________________ Sic58

31st July 2009, 01:26 PM	#4677
nicoch58 diyAudio Member Join Date: Oct 2004	I prefear use franch r-core trafo and FR ,girl too __________________ Sic58

1st August 2009, 03:38 PM	#4679
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	what would be the peak current through the 0r15 if the speaker load demands 20Apk? Most of that peak demand will be met by the last cap in the chain. What percentage of rated dissipation would you aim for in the or15 for transient demands and continuous demands? __________________ regards Andrew T.


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1st August 2009, 02:27 PM	#4678
Razorblade diyAudio Member Join Date: Jun 2008	Hey, since i am building two F5 Monos at the moment, can anybody help me out with some questions regarding the power supply? I have already posted it here two pages back For example: in spice simulation i get a power dissapation of ca. 100mw when using 0.15 Ohm resistance in a crcrc configuration, wouldnt 1 3w resistor be enough then?

4th August 2009, 05:33 PM	#4680
brianco diyAudio Member Join Date: Aug 2005 Location: Scottish Borders - Kelso; on the famous Tweed River!	HELP NEEDED in UK PLEASE Can any Uk or Euro member recommend a supplier for the Power Supply caps and inductor coils. I have searched and other than a few difficult to understand sites can find little suitable. I would naturally like to get both from the same source as a single order. I am also looking for adequate heatsinks for this amp and am having similar trouble in finding well specified items in small quantity. Many thanks for any replies. Brian

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