BOSOZ - P3 and P4, what if 20K?

lgreen · 6th January 2004, 09:33 PM

Here is yet another BOSOZ question:

If all I have is are 20K pots for P3 and P4 and want to use those as a volume control in BOSOZ rather than the 5K indicated in the circuit schematic, should I just go for it or are other circuit changes necessary? In particular I was thinking of changing R11 and R12 to something smaller than their listed value (100K) to compensate. Any thoughts? What are the tradeoffs?

Assume I'm driving a number of different amps, including Aleph 3 (23K ohm input impedance).

Fox · 7th January 2004, 06:57 AM

Hi Igreen,

What you could do is placing a 2 to 5K resistor in series with the signal after the 100k resistor to ground. After the 2 to 5 K resistor, you place the 20K pot between the signal and ground. Now you have just created an elegant shunt-attenuator.

With a 5 k series resistor you loose 2,5dB of gain, which may be to much. So it is probably best to take a 2K series resistor.

Hope this helps,

JP

6th January 2004, 09:33 PM	#1
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	BOSOZ - P3 and P4, what if 20K? Here is yet another BOSOZ question: If all I have is are 20K pots for P3 and P4 and want to use those as a volume control in BOSOZ rather than the 5K indicated in the circuit schematic, should I just go for it or are other circuit changes necessary? In particular I was thinking of changing R11 and R12 to something smaller than their listed value (100K) to compensate. Any thoughts? What are the tradeoffs? Assume I'm driving a number of different amps, including Aleph 3 (23K ohm input impedance).

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7th January 2004, 06:57 AM	#2
Fox diyAudio Member Join Date: Dec 2002 Location: The Netherlands	Hi Igreen, What you could do is placing a 2 to 5K resistor in series with the signal after the 100k resistor to ground. After the 2 to 5 K resistor, you place the 20K pot between the signal and ground. Now you have just created an elegant shunt-attenuator. With a 5 k series resistor you loose 2,5dB of gain, which may be to much. So it is probably best to take a 2K series resistor. Hope this helps, JP

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