Mezmerize DCB1 Building Thread - Page 19

AndrewT · 29th January 2011, 04:27 PM

That's a stepped attenuator.
All the components would need to be 0.1% or better.

The sums of components in the two balance halves would have to be 0.1% or better.
The resistances across the contacts would need to vary by an amount of less than that, that would cause more then 0.1% of mismatch in any of the sums of values.

It can be done, but it will need a lot of matching (=time)

johnwmclean · 29th January 2011, 08:58 PM

Dact offer 0.1% or better accuracy.

Stepped Attenuators - Soundlabs Group

ramallo · 1st February 2011, 10:39 PM

Finally I did the hot-rod first stage and I'm very impressed, the bass are incredible, as well the sound stage are wider and deeper.

I'm using two 16 Ohm resistors in parallel, the DCB1 are now close to 200m to 210mA (The voltage across the resistor drops a bit) (The DCB1 is cold).

A photos of the "near to finish" Mezmerize:

Thanks Salas!

Horio · 1st February 2011, 11:05 PM

Looks great Ramallo!

How warm does the bottom of your case get with the hot-rod (200mA)? I'm doing something very similar.

Salas · 1st February 2011, 11:07 PM

Quote:

Originally Posted by ramallo

Thanks Salas!

Nice pictures, nice build. You are welcome, and enjoy.

ramallo · 1st February 2011, 11:17 PM

Quote:

Originally Posted by Horio

Looks great Ramallo!

How warm does the bottom of your case get with the hot-rod (200mA)? I'm doing something very similar.

Is cold

. The hottest

part of the pre are the 7812 and the power resistors.

The bottom are a 3mm aluminum.

johnwmclean · 2nd February 2011, 01:54 AM

Beautiful build ramallo!

bkdog · 2nd February 2011, 02:30 AM

Indeed that is a lovely build Ramallo - may I ask what the case is?

ramallo · 2nd February 2011, 09:06 AM

Quote:

Originally Posted by bkdog

Indeed that is a lovely build Ramallo - may I ask what the case is?

Is a Hifi2000 case, 1NGXA347 modu

AndrewT · 2nd February 2011, 09:43 AM

Hi Ram,
looks fantastic. Be proud and enjoy.

I am surprised at your remark "cold".
Using a 15+15Vac transformer and 200mA CCS there is some 8W of dissipation. That should not feel cold.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
WTB Mezmerize PCB	3GGG	Swap Meet	3	16th January 2011 09:15 AM
FS : F3 PCB + PSU - Hypnotize - Mezmerize - LightSpeed	korben69	Swap Meet	13	17th May 2010 12:56 PM
My XXLS Subwoofer building thread...	harrisni	Subwoofers	9	28th October 2007 08:21 PM
Fave song from SOAD 'Mezmerize'?	PeteMcK	Music	6	8th March 2006 03:12 AM
Gainclone building thread based on BrianGT's boards	meat	Chip Amps	752	8th August 2004 06:25 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

29th January 2011, 04:27 PM	#181
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	That's a stepped attenuator. All the components would need to be 0.1% or better. The sums of components in the two balance halves would have to be 0.1% or better. The resistances across the contacts would need to vary by an amount of less than that, that would cause more then 0.1% of mismatch in any of the sums of values. It can be done, but it will need a lot of matching (=time)

29th January 2011, 08:58 PM	#182
johnwmclean diyAudio Member Join Date: Oct 2009	Dact offer 0.1% or better accuracy. Stepped Attenuators - Soundlabs Group

1st February 2011, 10:39 PM	#183
ramallo diyAudio Member Join Date: Nov 2004 Location: Madrid	Finally I did the hot-rod first stage and I'm very impressed, the bass are incredible, as well the sound stage are wider and deeper. I'm using two 16 Ohm resistors in parallel, the DCB1 are now close to 200m to 210mA (The voltage across the resistor drops a bit) (The DCB1 is cold). A photos of the "near to finish" Mezmerize: Thanks Salas!

1st February 2011, 11:05 PM	#184
Horio Newbie diyAudio Member Join Date: Mar 2010 Location: San Francisco	Looks great Ramallo! How warm does the bottom of your case get with the hot-rod (200mA)? I'm doing something very similar.

2nd February 2011, 01:54 AM	#187
johnwmclean diyAudio Member Join Date: Oct 2009	Beautiful build ramallo!

2nd February 2011, 02:30 AM	#188
bkdog diyAudio Member Join Date: May 2005 Location: in a house	Indeed that is a lovely build Ramallo - may I ask what the case is?

2nd February 2011, 09:43 AM	#190
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi Ram, looks fantastic. Be proud and enjoy. I am surprised at your remark "cold". Using a 15+15Vac transformer and 200mA CCS there is some 8W of dissipation. That should not feel cold.