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BOSOZ as low pass filter
BOSOZ as low pass filter
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Old 22nd January 2007, 06:46 PM   #1
audionut is offline audionut
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BOSOZ as low pass filter
Default BOSOZ as low pass filter

Can I turn a channel of a BOSOZ preamp into a one pole low pass filter?? For various reasons this would be convenient, as apposed to an RC network down stream from the BOSOZ.

Thanx
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Old 22nd January 2007, 07:01 PM   #2
tschrama is offline tschrama  Netherlands
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or an active filter diy project from the boss him self......cann't wait to get started on a project like that
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Old 22nd January 2007, 08:10 PM   #3
Nelson Pass is offline Nelson Pass  United States
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BOSOZ as low pass filter
A simple resistor with a capacitor to ground at the input
would do it. The resistor can be fairly high in value, as the
input capacitance of the Mosfet is the only load to speak of.

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Old 22nd January 2007, 08:43 PM   #4
audionut is offline audionut
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BOSOZ as low pass filter
I have the volume control in front of the preamp...would that interact with the capacitor??
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Old 22nd January 2007, 11:38 PM   #5
Babowana is offline Babowana  South Korea
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Quote:
Originally posted by audionut


I have the volume control in front of the preamp...would that interact with the capacitor??

With the RC network, the critical frequency fc=1/(6.28RC).
So, R value is variable, the fc value is also getting variable.
I would replace the input volume with an output volume.
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Old 22nd January 2007, 11:50 PM   #6
Zen Mod is offline Zen Mod  Serbia
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BOSOZ as low pass filter
Quote:
Originally posted by audionut
I have the volume control in front of the preamp...would that interact with the capacitor??

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Old 23rd January 2007, 06:47 PM   #7
Nelson Pass is offline Nelson Pass  United States
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BOSOZ as low pass filter
Clever enough would mean putting the filter before the
volume control so that the changing source impedance of the
volume control will not affect the filter much.
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