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 11th July 2008, 07:54 AM #11 Vix   diyAudio Member     Join Date: Nov 2003 Location: Somewhere on Planet Earth It looks to me that you should simply build the Boz as in original schematics, adjust for 40 mA bias, and use some input attenuation, if overload is an issue. You can use 47 K pot first, and then, after you have found the appropriate setting, measure the resistance and replace the pot with fixed resistors. Then, use the pot at the output as a volume control. Vix
 11th July 2008, 05:07 PM #12 rtate   diyAudio Member   Join Date: Jan 2002 Location: Burlington, Ontario, Canada How do I determine a value for input attenuation? I have read post stating anywhere from 47k to100k to 470k The different values must make a difference....
 11th July 2008, 05:31 PM #13 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders Attenuation is a ratio, not a value. -20dB = 1/10 -40dB = 1/100 The resistances in the attenuator create that ratio. __________________ regards Andrew T.
 11th July 2008, 06:14 PM #14 rtate   diyAudio Member   Join Date: Jan 2002 Location: Burlington, Ontario, Canada So for a CD player with a specified output of 2Vrms , what value resistance would be needed to get the proper ratio?
 11th July 2008, 06:47 PM #15 AndrewT   R.I.P.   Join Date: Jul 2004 Location: Scottish Borders to get a ratio you need two resistances. 1r0 and 100r gives -40dB similarly 5k0 and 500k gives -40dB. or any value in between can be arranged to work as a -40dB attenuator. The pot/attenuator is a variable PAIR of resistances that usually give attenuation ratio between 0db an -80dB. __________________ regards Andrew T.
Manu
diyAudio Member

Join Date: Nov 2002
Location: Vienna, Ostrich
Quote:
 Originally posted by rtate How do I determine a value for input attenuation? I have read post stating anywhere from 47k to100k to 470k The different values must make a difference....
Your ear will determine what is best for you.
and if your layout allows it, try different values ...
My experience is that too much input attenuation makes sound less dynamic...

How should, I say thats not math, thats life...

Manu

 11th July 2008, 07:04 PM #17 rtate   diyAudio Member   Join Date: Jan 2002 Location: Burlington, Ontario, Canada other articles that i have read say that input attenuation will limit the bandwith by rolling off the HF above 15kh Is this true in this case?

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