BOSOZ--variable impedance volume attenuator

[jh6you]

Hi, Wuffwaff and Stefanobilliano,

I was talking about sh*t of non-sense in this thread. Both of you (and other readers) will know what I mean. I feel full shame on my ignorance. I was wrong and you were right.

By the way, my BOSOZ has the drain resistor of 500 ohms and the gain control resistor of 200 ohms between the source pins. Therefore, the amp gain is approximated as about 14dB. Meanwhile, the above volume attenuator (the final one) provides a resistor between the drain and the ground of about 104 ohms with repect to AC. So, the amp gain is reduced by about -15 dB. Therefore, at maximum volume, my amp's total gain is about unity. This unity gain is considered enough for me.

By doing this, one thing I earned is that the variation of output impedance is managed low and narrow. I wonder whether this will work positive or not, though.

If you have any comment, would be appreciated.

[hifimaker]

Originally posted by tonywong
Hi,

you can shop for electronic components in Sim Lim Tower and Sim Lim Square in Singapore.

regards,
tony

Hi Tony,

I spent 4 years in Singapore. I used to love shopping in Sim Lim Tower and Square. I also liked Audio shopping in Adelphi shopping center by the court house. I never saw much Pass gear, but a lot of McIntosh, and Tube stuff. Pretty fun though.

I remember awesome grey market deals on Rotel and other gear made in Asia.

Take care,

-David

[jh6you]

Phew¡¦

I have been polluting this thread with non-sense and misprint.

Okay, here is overall view of my attenuator.
The indicated gain values are actually total gain at output,
and they are calculated by Excel (carefully).
The maximum gain is slightly less than unity gain.
This one is working well for my system.

It is getting warmer here. It seems that spring is arriving soon.