BOSOZ volume control

ToB · 15th August 2002, 02:49 PM

Hi

If I have to chose only one side of volume control(input or output), where should i put it? Is there any modification on main board for elimination? I use balanced.

Thank you for input
ToB

Peter Daniel · 15th August 2002, 03:20 PM

If you can find small enough value (below 5K), it would be better at the output.

UrSv · 15th August 2002, 03:51 PM

I think that the manual for BoSoZ suggested that one of the best set-ups would be to put a fixed resistor attenuator at the input, as the performance was best with 1-2 V output, and then the volume control at the output. The 10 dB gain example was 0.3 V in for 1 V out.

Ref bottom right on page 7.

/urSv

Peter Daniel · 15th August 2002, 03:59 PM

If your source component has a high output this would be prefferable, but it's not always the case. Less resistors in the signal path the better sound.

ralf · 21st August 2002, 11:38 AM

I build a stepped attenuator with 5K and put it on the output of BoSoz, cause there the speakers are without "sssssss"

Regards,
Ralf

skaara · 21st August 2002, 01:01 PM

I have them at output, because when you are listening to lower levels, you reduce noise too.

ToB · 23rd August 2002, 04:12 PM

Thank you all

For P3, P4, I'm wondering in step attenuated calculation. If P1, P2, P5 will be deleted and R15=430 ohms(10db), what configuration to calculate? I will use 12 steps-4 decks rotary switch.

Shunt or Single sieries shunt attenuator, is good for this project?
Could you recomend any web that has resistor calulator?

Thank you

ToB

MarkL · 23rd August 2002, 06:39 PM

I build a BoSoZ with 3 controls, all discrete with stepped switches: 0 to -11dB ladder at the input (two, 4-deck switches), with separate left and right to enable some balance, a 5dB per step master shunt attenuator at the output (one, 4-deck switch), and a 5dB per step gain control linking the two MOSFETs (one, 2-deck switch).

If I were to do it again, I would eliminate the input ladder, expand the range of the gain control, and have fine attenuation as a shunt at the output (two, 2-deck switch).

15th August 2002, 02:49 PM	#1
ToB diyAudio Member Join Date: Aug 2002 Location: Thailand	BOSOZ volume control Hi If I have to chose only one side of volume control(input or output), where should i put it? Is there any modification on main board for elimination? I use balanced. Thank you for input ToB

15th August 2002, 03:20 PM	#2
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	If you can find small enough value (below 5K), it would be better at the output. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

15th August 2002, 03:59 PM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	If your source component has a high output this would be prefferable, but it's not always the case. Less resistors in the signal path the better sound. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

21st August 2002, 11:38 AM	#5
ralf diyAudio Member Join Date: Dec 2001 Location: Germany	stepped attenuator I build a stepped attenuator with 5K and put it on the output of BoSoz, cause there the speakers are without "sssssss" Regards, Ralf

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15th August 2002, 03:51 PM	#3
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden/Switzerland	I think that the manual for BoSoZ suggested that one of the best set-ups would be to put a fixed resistor attenuator at the input, as the performance was best with 1-2 V output, and then the volume control at the output. The 10 dB gain example was 0.3 V in for 1 V out. Ref bottom right on page 7. /urSv

21st August 2002, 01:01 PM	#6
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	I have them at output, because when you are listening to lower levels, you reduce noise too.

23rd August 2002, 04:12 PM	#7
ToB diyAudio Member Join Date: Aug 2002 Location: Thailand	Thank you all For P3, P4, I'm wondering in step attenuated calculation. If P1, P2, P5 will be deleted and R15=430 ohms(10db), what configuration to calculate? I will use 12 steps-4 decks rotary switch. Shunt or Single sieries shunt attenuator, is good for this project? Could you recomend any web that has resistor calulator? Thank you ToB

23rd August 2002, 06:39 PM	#8
MarkL diyAudio Member Join Date: May 2002 Location: Topeka, KS	I build a BoSoZ with 3 controls, all discrete with stepped switches: 0 to -11dB ladder at the input (two, 4-deck switches), with separate left and right to enable some balance, a 5dB per step master shunt attenuator at the output (one, 4-deck switch), and a 5dB per step gain control linking the two MOSFETs (one, 2-deck switch). If I were to do it again, I would eliminate the input ladder, expand the range of the gain control, and have fine attenuation as a shunt at the output (two, 2-deck switch).

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