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Old 20th June 2004, 08:40 AM   #1
yoke is offline yoke  Croatia
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Default x-BoSoZ volume on in or output

Hi...
Well I am building X-BoSoZ by Henrik schematic...now I'am thinking of buying series attenuator for it and have some questions...

I remember reading some where that Nelson Pass likes putting pot. on the output , after everything is said and done...but in Henrik schematic it's on Input...Should I use it on input or output ???
I mean...probably I would need to use on input any way , but for volume control , should I use attenuator on input or output ???

and If I'am gona use it on output for which value I should go ??? In BZL stage Mr. Pass wrote 5KOhm...

Thanks
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Old 20th June 2004, 08:46 AM   #2
Variac is offline Variac  United States
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What amp are you driving?
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Old 20th June 2004, 08:53 AM   #3
yoke is offline yoke  Croatia
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It will be Aleph-X
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Old 20th June 2004, 09:19 AM   #4
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Hi,

you could use a balanced output attenuator if you´re driving an Aleph-X. I use one in my x-bosoz to drive my Aleph 5.

William
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Old 20th June 2004, 10:00 AM   #5
yoke is offline yoke  Croatia
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Hi wuffwaff ...
What value are you useing on output ?
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Old 20th June 2004, 08:50 PM   #6
yoke is offline yoke  Croatia
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Old 20th June 2004, 08:56 PM   #7
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i use this at the output of my BZLS : http://home.tu-clausthal.de/~tpa/relais/index.html
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Old 23rd June 2004, 11:28 AM   #8
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Hi,

I´m using 2 x 2k2 as output series resistors. You have to calculate the value for the stepped attenuator in between to get the steps you want. Using a standard log pot doesn´t work because it is way too sensitive at low values and you will always have one channel that´s still playing when the other one is already off.

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Old 23rd June 2004, 05:32 PM   #9
Variac is offline Variac  United States
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OK, so you have output resistors in there, then short between the outputs. Yoke & I are probably using stepped attenuators, which appear to be the best for this approach, as the channel tracking is very good.

Now I guess our problem is as you say- what are good values to get a reasonable range of control with say 24 steps with this shorting approach?
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Old 24th June 2004, 07:43 AM   #10
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Hi,

well the first step needs to be shorted (for silence) The last one open (for max. output). In between I would go for 3dB steps top down and maybe 6dB for the last 2 or 3 steps.
If you know wich output resistors you will use you can just calculate the value of the shorting resistor for any given dB value.

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