how to attenuate aleph p 1.7

elviukai · 31st January 2007, 07:24 PM

hi, I am using kristijans board, and I have laying arround few dact 10kohm atenuators, how ever it way too high for p 1.7. at 10kohm sound is very loud. it should be 1-2kohm I think

what parts I should change do use this 10kohm dact in p 1.7?

thanks in advance

Nisbeth · 31st January 2007, 07:31 PM

You can use a 10k attenuator on the input instead.

/U.

wuffwaff · 31st January 2007, 07:31 PM

Hi,

are you shure you connected it the right way? The only difference between a 2k and a 10k pot is the output and input impedance. The attenuation should be the same.

William

elviukai · 31st January 2007, 07:44 PM

hi wuffwaff if I use on input I will need balanced atenuator(double price)

I am using in in the same place as in kristijan schematic. just instead 2kohm I use 10kohm. the sound is very loud with 10kohm even in mimimum position(10kohm)

apassgear · 1st February 2007, 12:05 AM

1K where the pot is runs fine according to NP

barryblue · 1st February 2007, 12:24 AM

Hi,

If you have the DACT connected as the 2K potentiometer in your schematic you effectively do are not attenuating the signal. The 2K potentiometer sets the Master gain for one channel as per the original P1.7. You do not require a DACT for this just s simple multiturn pot.

You need to move the DACT to the input or output (preferably) to reduce the volume......

Hope this helps!

elviukai · 1st February 2007, 07:15 AM

elviukai · 1st February 2007, 08:52 AM

I found thread
Aleph P 1.7: Need help to choose som caps

where Mr. Nelson said that there is possible to use 1kohm single pot to adjust volume.(place a single potentiometer between the Source
pins of the Mosfets, where a good value is about 1 Kohm.)

anybody tried that?

harryeng · 2nd February 2007, 08:58 AM

Hi Elviukai,

I tried, and gave up.... I have the same PCB as you have, but wanted to use large capacitors meaning I had all sort of problems with space.

You can use the 2K potmeter to play with the gain, but normally you also need to attentuate so that would be a no-go.
I had a pot I tried to put in front, but as my CD player had no bufferstage (don't ask) that ended into very strange effects.

I ended up using a 2K resistor bank on the output, using a board by Mikkel.

Now I have a great sounding P1.7!

Greetings, Harry.

Johnwkkwan · 8th March 2007, 07:37 PM

Hi Harry,

Your preamp lokk very nice.

Notice you have a display on front panel and relay volumn control.

Is it remote control ?

I like to have one like this for my BZLS.

Do you mind post a link where to buy this one, how much is this ?

Thanks !

John

31st January 2007, 07:31 PM	#3
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi, are you shure you connected it the right way? The only difference between a 2k and a 10k pot is the output and input impedance. The attenuation should be the same. William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

31st January 2007, 07:44 PM	#4
elviukai diyAudio Member Join Date: Apr 2003 Location: EU- Electronic Union country	hi wuffwaff if I use on input I will need balanced atenuator(double price) I am using in in the same place as in kristijan schematic. just instead 2kohm I use 10kohm. the sound is very loud with 10kohm even in mimimum position(10kohm) __________________ natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..

1st February 2007, 12:24 AM	#6
barryblue diyAudio Member Join Date: Jun 2004 Location: uk	Too loud Hi, If you have the DACT connected as the 2K potentiometer in your schematic you effectively do are not attenuating the signal. The 2K potentiometer sets the Master gain for one channel as per the original P1.7. You do not require a DACT for this just s simple multiturn pot. You need to move the DACT to the input or output (preferably) to reduce the volume...... Hope this helps!

1st February 2007, 07:15 AM	#7
elviukai diyAudio Member Join Date: Apr 2003 Location: EU- Electronic Union country	__________________ natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..

1st February 2007, 08:52 AM	#8
elviukai diyAudio Member Join Date: Apr 2003 Location: EU- Electronic Union country	I found thread Aleph P 1.7: Need help to choose som caps where Mr. Nelson said that there is possible to use 1kohm single pot to adjust volume.(place a single potentiometer between the Source pins of the Mosfets, where a good value is about 1 Kohm.) anybody tried that? __________________ natural sound reproduction from traditional dynamic drivers?!! come on.. no no, it can be.. it must be!..


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31st January 2007, 07:31 PM	#2
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	You can use a 10k attenuator on the input instead. /U.

1st February 2007, 12:05 AM	#5
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	1K where the pot is runs fine according to NP

8th March 2007, 07:37 PM	#10
Johnwkkwan diyAudio Member Join Date: Dec 2006	Hi Harry, Your preamp lokk very nice. Notice you have a display on front panel and relay volumn control. Is it remote control ? I like to have one like this for my BZLS. Do you mind post a link where to buy this one, how much is this ? Thanks ! John

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