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 17th February 2012, 11:39 AM #221 diyAudio Member     Join Date: May 2008 This in case no diodes are used. As diodes minimize losses.
 17th February 2012, 11:47 AM #222 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders I would expect the diodes to have at most a marginal effect on current contribution while the amp is operating in ClassA mode. The diodes would in my opinion only provide significant increases in available current when output current is significantly more than the Max ClassA output. If the diodes were already passing significant current in ClassA mode then I think you will find that they over-rule the stabilising effect of the source resistor. __________________ regards Andrew T. Sent from my desktop computer using a keyboard
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Join Date: May 2004
Location: Westland
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Quote:
 Originally Posted by MASantos Hw did you decide on the value of K and what does it represent?
Hiraga mentions a formula (le classe A)
Pmax = 2Vcc*a)^2
8*Rl

and uses a = 0,85 for bipolars, being the 'collector loss'; with FETS there is also inefficiency in driving, first of all a voltage component (not so much resistance) and there are source resiatances that dominate...
For his amp at 18V+/- he gets 15 watts; his formula at 33 volts this gives 50 watts too! I assume that this K is a similar 'drivability'.
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 17th February 2012, 12:01 PM #224 diyAudio Member     Join Date: May 2008 At 3.5A, loss is 1.65v into source resistor let alone . Diodes should keep about 0.65 volts across that resistor at the same current. Which is 1volt less. Last edited by bobodioulasso; 17th February 2012 at 12:03 PM.
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Join Date: Apr 2009
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Quote:
 Originally Posted by AndrewT I too get lost with the introduction of k. Prior to that K, everything is correct. ... ClassA output current.

I have assumed the power factor of the linear power supply at the range of 0.6~0.8
Shouldn't it be calculate in this way? If its wrong, please point me out
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 17th February 2012, 01:50 PM #226 diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao peak output voltage level + voltage loss across the drain resistor + voltage to open up the output devices. (and a little extra ) __________________ A veces la Moral y la Ley no están de Acuerdo. Si No, se puede esperar a mi llegada, el placer es todo mío. https://www.youtube.com/watch?v=RD4XzlCo60I
 17th February 2012, 03:38 PM #227 diyAudio Member     Join Date: Jul 2011 Location: India and Kuwait where can i buy the f5 turbo PCB s from ?
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Join Date: Mar 2004
Location: Bangalore
Quote:
 Originally Posted by biju55 where can i buy the f5 turbo PCB s from ?
Just about now, people are discussing few layouts. They are not available to buy from anywhere. You can probably make your own PCB following the layouts discussed here.
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 17th February 2012, 04:40 PM #229 diyAudio Member     Join Date: May 2008 If you are in a hurry, you might use Cviller F5 V2 boards from diyaudio store.
 17th February 2012, 06:17 PM #230 diyAudio Editor     Join Date: Dec 2001 Location: San Francisco, USA San José, Costa Rica Or the F-5c V2 boards from the store But they would both need some reworking.. __________________ 2016 S.F. Burning Amp Festival To Be Nov. 13 Burning Amp thread here on diyAudio Last edited by Variac; 17th February 2012 at 06:20 PM.

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