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Old 29th January 2011, 04:27 PM   #181
AndrewT is offline AndrewT  Scotland
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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)
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Old 29th January 2011, 08:58 PM   #182
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Dact offer 0.1% or better accuracy.

Stepped Attenuators - Soundlabs Group
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Old 1st February 2011, 10:39 PM   #183
ramallo is offline ramallo  Europe
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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:

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Thanks Salas!
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Old 1st February 2011, 11:05 PM   #184
Horio is offline Horio  United States
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Looks great Ramallo!

How warm does the bottom of your case get with the hot-rod (200mA)? I'm doing something very similar.
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Old 1st February 2011, 11:07 PM   #185
Salas is offline Salas  Greece
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Thanks Salas!
Nice pictures, nice build. You are welcome, and enjoy.
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Old 1st February 2011, 11:17 PM   #186
ramallo is offline ramallo  Europe
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Quote:
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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.
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Old 2nd February 2011, 01:54 AM   #187
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Beautiful build ramallo!
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Old 2nd February 2011, 02:30 AM   #188
bkdog is offline bkdog  Australia
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Indeed that is a lovely build Ramallo - may I ask what the case is?
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Old 2nd February 2011, 09:06 AM   #189
ramallo is offline ramallo  Europe
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Indeed that is a lovely build Ramallo - may I ask what the case is?
Is a Hifi2000 case, 1NGXA347 modu
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Old 2nd February 2011, 09:43 AM   #190
AndrewT is offline AndrewT  Scotland
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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.
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