Aleph "L" Stepped attenuator on the input or the output?

Mark A. Gulbrandsen · 12th March 2003, 04:19 AM

Having built Jens digital stepped attenuator, and am very pleased with it, I was wondering what you all feel about having it on the input vs. the output of the "L". Right now it is on the output.
Thanks for any tips and advice!!
Mark

Mad_K · 12th March 2003, 10:52 AM

Better to have it on the output; this way it also attenuates noise produced by the circuit..

Aiace · 12th March 2003, 11:21 AM

better if you use on input, so at the normal listening volume you got very low distortion.
Aiace

Mark A. Gulbrandsen · 12th March 2003, 02:28 PM

Well, I'm not sure which way to go with it. I have never checked the s/n of my L and the input overload point either. for that matter. I'm inclined to put it at the input if the S/N of the L is good...and it really ought to be. Since the attenuator is only 8 bit I can't really hook it up as a cut in for the circuit at a certain level like Nelson did in the L.
Am working on getting parts together to build a P but it will be a while....
Mark

jam · 12th March 2003, 02:33 PM

Years ago Yamaha put attenuators at both the input and outputs. This avoided overload and provided the best noise performance.

Jam

Nickolas K. · 12th March 2003, 03:12 PM

Why don't u check the Aleph "L" Service Manual and do things like NP does?
Just insert a 22k resistor at the input to get about 6 db of gain and use the attenuator at the output.

Nick

Mark A. Gulbrandsen · 13th March 2003, 12:21 AM

Has anyone out there ever measured the overload point of any of the home brew L's and, or the SN ratio? With that high of operating voltage it should have quite a high overload(clip) point.
Mark

12th March 2003, 04:19 AM	#1
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Aleph "L" Stepped attenuator on the input or the output? Having built Jens digital stepped attenuator, and am very pleased with it, I was wondering what you all feel about having it on the input vs. the output of the "L". Right now it is on the output. Thanks for any tips and advice!! Mark

12th March 2003, 10:52 AM	#2
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	Better to have it on the output; this way it also attenuates noise produced by the circuit.. __________________ Mads K

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
What makes an amplifier "bright", "warm", or "neutral"?	JohnS	Solid State	51	13th December 2009 06:42 PM
What Does Fostex "Rated Input" and "Music Power"	mark02131	Full Range	3	2nd January 2007 08:31 PM
Balanced line stage- input or output attenuator	nobody special	Pass Labs	4	7th April 2006 01:18 PM
Fostex "rated input" and "music power"	hugz	Full Range	12	16th March 2006 04:33 PM
Aleph P input attenuator	ElectroNick	Pass Labs	1	16th September 2003 08:28 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

12th March 2003, 11:21 AM	#3
Aiace diyAudio Member Join Date: Feb 2003 Location: Florence	better if you use on input, so at the normal listening volume you got very low distortion. Aiace

12th March 2003, 02:28 PM	#4
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Well, I'm not sure which way to go with it. I have never checked the s/n of my L and the input overload point either. for that matter. I'm inclined to put it at the input if the S/N of the L is good...and it really ought to be. Since the attenuator is only 8 bit I can't really hook it up as a cut in for the circuit at a certain level like Nelson did in the L. Am working on getting parts together to build a P but it will be a while.... Mark

12th March 2003, 02:33 PM	#5
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Years ago Yamaha put attenuators at both the input and outputs. This avoided overload and provided the best noise performance. Jam

12th March 2003, 03:12 PM	#6
Nickolas K. diyAudio Member Join Date: Apr 2002 Location: Athens	Why don't u check the Aleph "L" Service Manual and do things like NP does? Just insert a 22k resistor at the input to get about 6 db of gain and use the attenuator at the output. Nick

13th March 2003, 12:21 AM	#7
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Has anyone out there ever measured the overload point of any of the home brew L's and, or the SN ratio? With that high of operating voltage it should have quite a high overload(clip) point. Mark

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)