The remote control paratactic volume control - Page 3

amplifierguru · 26th April 2005, 03:06 AM

Hi audio-gd,

Can you scale the R's down so Rout = 1K . 10 times lower and what would be Rin loading for previous stage. High Z is more noisy also a good reason for low Z.

HFGuy · 26th April 2005, 04:21 AM

Thermal Noise (also called Johnson Noise)

en = sqrt{4kTRdelta(f)}

Reduce the bandwidth or Resistance

amplifierguru · 26th April 2005, 06:12 AM

Very good, HF Guy!
that little k is Boltzmann's constant = 1.38 x 10to the power -23 juoles/deg kelvin. Not something I have instant recall of always.

I always remember it as 4nV/ sqrt Hz for a 1K resistor and proportional to sqrt R for scaling.

It helps being a physicist.

audio-gd · 26th April 2005, 02:43 PM

Change the resistance can change the impedance, but a bit thick small will weightily load to forward stage, although it can lessen the noise and more.

amplifierguru · 27th April 2005, 01:22 AM

Audio-gd

How weighty - 10K loading on CD or line amp is OK.

mastertech · 27th April 2005, 01:37 AM

what parasitic?
what is parasitic volume control?
all i see is a logarithmic attenuatorl
please enlighten me

audio-gd · 27th April 2005, 02:21 AM

10K is ok, but if less than 10K, for example :1K, it's weightiness load to CD or some buffer.

amplifierguru · 27th April 2005, 02:34 AM

Just to clarify, you can make it so it is -

10K load on preamp and 1K source to power amp, yes?

audio-gd · 27th April 2005, 01:50 PM

No, I only can make as a manual volume controler

Artmaster · 28th April 2005, 03:26 PM

volume controler... what for?
could you change volume level in the concert hall?

I'm not think so.
I never do any volume control in my amplifier. I've set it up during instalation.
I have not problem about different room reaction by different sound precure

and I have clean fron panel as well
http://www.artmaydan.org.ua/hi-end/amp_s.jpg
http://www.artmaydan.org.ua/amp.html

28th April 2005, 03:26 PM	#30
Artmaster diyAudio Member Join Date: May 2004 Location: Kiev Blog Entries: 1	volume controler... what for? could you change volume level in the concert hall? I'm not think so. I never do any volume control in my amplifier. I've set it up during instalation. I have not problem about different room reaction by different sound precure and I have clean fron panel as well http://www.artmaydan.org.ua/hi-end/amp_s.jpg http://www.artmaydan.org.ua/amp.html __________________ Artmaster live in www.artmaydan.org.ua

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26th April 2005, 03:06 AM	#21
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Hi audio-gd, Can you scale the R's down so Rout = 1K . 10 times lower and what would be Rin loading for previous stage. High Z is more noisy also a good reason for low Z.

26th April 2005, 04:21 AM	#22
HFGuy diyAudio Member Join Date: Sep 2004 Location: Toronto, Ontario	Thermal Noise (also called Johnson Noise) en = sqrt{4kTRdelta(f)} Reduce the bandwidth or Resistance

26th April 2005, 06:12 AM	#23
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Very good, HF Guy! that little k is Boltzmann's constant = 1.38 x 10to the power -23 juoles/deg kelvin. Not something I have instant recall of always. I always remember it as 4nV/ sqrt Hz for a 1K resistor and proportional to sqrt R for scaling. It helps being a physicist.

26th April 2005, 02:43 PM	#24
audio-gd diyAudio Member Join Date: Oct 2004	Change the resistance can change the impedance, but a bit thick small will weightily load to forward stage, although it can lessen the noise and more.

27th April 2005, 01:22 AM	#25
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Audio-gd How weighty - 10K loading on CD or line amp is OK.

27th April 2005, 01:37 AM	#26
mastertech Banned Join Date: Mar 2005 Location: Australia	what parasitic? what is parasitic volume control? all i see is a logarithmic attenuatorl please enlighten me

27th April 2005, 02:21 AM	#27
audio-gd diyAudio Member Join Date: Oct 2004	10K is ok, but if less than 10K, for example :1K, it's weightiness load to CD or some buffer.

27th April 2005, 02:34 AM	#28
amplifierguru Account Disabled Join Date: Aug 2004 Location: Earth	Just to clarify, you can make it so it is - 10K load on preamp and 1K source to power amp, yes?

27th April 2005, 01:50 PM	#29
audio-gd diyAudio Member Join Date: Oct 2004	No, I only can make as a manual volume controler

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