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Old 4th July 2008, 03:26 AM   #131
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Nelson, I saw that the B1 boards will be available on PassDIY, will the B2 boards eventually be available as well?

-Justin
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Old 4th July 2008, 03:35 AM   #132
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Probably.
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Old 4th July 2008, 04:08 AM   #133
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what's the ETA for the B2 to be released?
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Old 4th July 2008, 05:31 AM   #134
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I have 10 boards to stuff when I have time.
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Old 4th July 2008, 05:53 AM   #135
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Quote:
Originally posted by despotic931
what's the ETA for the B2 to be released?
B2? Vass ees B2?

se
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Old 4th July 2008, 05:57 AM   #136
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Dual buffered bi-amp splitter with volume adjust.
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Old 4th July 2008, 06:51 AM   #137
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Quote:
Originally posted by Nelson Pass
Dual buffered bi-amp splitter with volume adjust.
Ah, thanks. Thought it might have been a balanced B1.

se
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Old 4th July 2008, 07:34 AM   #138
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Default B2 biamp buffer

Hi Steve,
The B2 Biamp Buffer. You say you tried bi-amping but didn’t get sound you wanted? The B2 uses two pairs of the buffers found in the B1 but configured for splitting the output of the preamp with variable relative gain to two sets of power amplifiers. This allows not only isolated amplifier impedance buffering, but adjusts the gain levels for different amplifiers. Even for identical amplifier channels it also allows the subtle adjustment required to get exactly the top/bottom balance you need.
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Old 4th July 2008, 07:38 AM   #139
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Quote:
Originally posted by udailey
Here is an even easier way to do something similar and yet completely different. This, I think, is my afternoon project sometime in July after F5 and B1 are built.



Dual Audio Taper Potentiometer with Pushbutton Control
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2778
* Two digitally controlled, 65-position potentiometers
* Ultra low-power consumption
* Software and hardware controlled mute
* Digital or mechanical pushbutton wiper control
* Potentiometers can be linked for stereo control
* Logarithmic resistive characteristics (1dB per step)
* Zero-crossing detection to eliminate noise
* Serial port communication
* Can be daisy-chained for single-processor, multidevice designs
* Operating temperature range: -40°C to +85°C
* Operating voltage range: 3V or 5V
* Resistance available: 45kΩ
$2.56 @ 1k

Where I can find the "schematic" (application) ?
I want the simplest one !
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Old 4th July 2008, 01:03 PM   #140
bappe is offline bappe  Sweden
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Default BJT switch attenuator

Hi Guys,

Here is my take on a BJT switch for a nice attenuator. It came to me this morning and i can't wait to wire it up tonight. It should have good BW and no DC offset, the only backside is that one needs two floating switch control voltages that are fairly well matched, the last bit of assymmetry can be trimmed away by adjusting individually for each switch R4 or R9.

BR,
Anders
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