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 13th March 2011, 04:35 PM #21 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain for your needs - you need to decrease sum current for regs to - say ~ 60mA max ( increase R1 in both regs to 10 ohms) there is no need for more of that , if active stage is drawing 20mA that way - roughly -overall consumption per channel is 60mA x Vdc = 60mA x 1,41 x 30V x2 regarding needed amplitude of output signal considering that current output of PCM for full blast is +/-1.2mA - just divide your needed p-p amplitude with 2,4mA and you'll get value for R6 this way ( with R6 1K5) , you'll have 3V6pp on output if you're going to use set of regs for both channels - go for 100mA as programmed current ; in that case R1's must be around 6R5 __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM Last edited by Zen Mod; 13th March 2011 at 04:38 PM.
 13th March 2011, 04:53 PM #22 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe So 4Vpp divided 2,4mA = 1k666 for R6 & I will have 2Vrms?
 13th March 2011, 07:43 PM #23 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain math is simple __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 13th March 2011, 10:07 PM #24 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe Thank you ZM
 13th March 2011, 10:15 PM #25 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain you're welcome ; answers are simple when questions are well constructed . __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
merlin el mago
diyAudio Member

Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
 Originally Posted by Iloveswan You should raise R2a's value a little bit unless you can accept around 1Vrms output. If you raise R2a's value, you need to change source resistors value accordingly too. About Mosfet match, it's easy to get a 1% Vgs matched pair from same production batch.
@ZM
So don't need to change R2 as Iloveswan suggested & he do bad calculations 1Vrms instead 1.8Vrms?

Last edited by merlin el mago; 14th March 2011 at 09:45 AM.

 14th March 2011, 10:01 AM #27 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain leave R2 as is __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
 14th March 2011, 10:13 AM #28 merlin el mago diyAudio Member     Join Date: Sep 2009 Location: Catalonia - Europe
Iloveswan
diyAudio Member

Join Date: Oct 2010
Location: San Jose
Quote:
 Originally Posted by merlin el mago @ZM So don't need to change R2 as Iloveswan suggested & he do bad calculations 1Vrms instead 1.8Vrms?
Correct. you should change R6 not R2... sorry for typo...

 16th March 2011, 10:24 AM #30 Zen Mod   Official Court Jester diyAudio Member     Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain naah ....... what's few numbers between friends ...... __________________ my Papa is smarter than your Nelson ! clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM

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