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Old 13th March 2011, 04:35 PM   #21
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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
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Old 13th March 2011, 04:53 PM   #22
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So 4Vpp divided 2,4mA = 1k666 for R6 & I will have 2Vrms?
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Old 13th March 2011, 07:43 PM   #23
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math is simple

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Old 13th March 2011, 10:07 PM   #24
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Thank you ZM
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Old 13th March 2011, 10:15 PM   #25
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you're welcome ;

answers are simple when questions are well constructed .
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Old 14th March 2011, 09:22 AM   #26
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Quote:
Originally Posted by Iloveswan View Post
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.
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Old 14th March 2011, 10:01 AM   #27
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leave R2 as is
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Old 14th March 2011, 10:13 AM   #28
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Old 16th March 2011, 05:19 AM   #29
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Quote:
Originally Posted by merlin el mago View Post
@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...
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Old 16th March 2011, 10:24 AM   #30
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naah .......

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