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Old 11th July 2003, 01:54 AM   #1
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Default Bosoz

Hi all

I am in the middle of building a bosoz pre amp, but I will only be using the + input and + output. My question is if the following parts are necessary for my application:
C1, R9, R11, R8, and R14.


Thanks
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Old 11th July 2003, 02:05 AM   #2
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lawbadman,

You will find details of the single ended operation in the original article.. http://www.passdiy.com/pdf/balzenpre.pdf

macka
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Old 11th July 2003, 02:55 AM   #3
eLarson is offline eLarson  United States
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Default Re: Bosoz

Quote:
Originally posted by lawbadman
Hi all

I am in the middle of building a bosoz pre amp, but I will only be using the + input and + output. My question is if the following parts are necessary for my application:
C1, R9, R11, R8, and R14.
You don't need C1, R9, and R11 for sure.

I left R8 and R14 on mine. I ended
up installing a balanced input on mine. Son of
Zen's bride does good work as a
balanced-to-single-ended converter.

Erik
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Old 11th July 2003, 05:50 AM   #4
moe29 is offline moe29  United States
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Just build it per the article. Short the negative input to ground.

then enjoy

Then when you want to use it as a unbalanced to balanced
converter (to run, say an Aleph 2) you're all set. I've run mine
unbalanced into an Aleph 3 for a while now and it sounds great.
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Old 11th July 2003, 04:23 PM   #5
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Thanks for the info guys.

I left out C1, R9, R11 and R8.

Has anyone done any modifications to the power supply for better sonics?
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Old 14th July 2003, 03:10 AM   #6
eLarson is offline eLarson  United States
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I made a minor adjustment by using a
choke-input filter after the rectifiers.

I can't say for sure that it made a colossal
improvent, but the basic quality of the
remaining crud was more of a hum than a buzz.

I suppose the hum would have driven me
crazy(*) more slowly than a buzz would, but I
still couldn't tolerate it. Therefore I ended up
adding the zener/source-follower
"regulator" from the article (lower voltage,
though, naturally).

Now it is plenty quiet enough for my listening
room where the ambient noise level is rather
higher than I'd like.

Erik

(* Okay, it's not a drive; it's more of a short,
leisurely stroll. )
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