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Old 12th March 2003, 04:19 AM   #1
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Default 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
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Old 12th March 2003, 10:52 AM   #2
Mad_K is offline Mad_K  Norway
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Better to have it on the output; this way it also attenuates noise produced by the circuit..
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Old 12th March 2003, 11:21 AM   #3
Aiace is offline Aiace  Italy
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better if you use on input, so at the normal listening volume you got very low distortion.
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Old 12th March 2003, 02:28 PM   #4
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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
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Old 12th March 2003, 02:33 PM   #5
jam is offline jam  United States
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Years ago Yamaha put attenuators at both the input and outputs. This avoided overload and provided the best noise performance.

Jam
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Old 12th March 2003, 03:12 PM   #6
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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
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Old 13th March 2003, 12:21 AM   #7
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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
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