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Old 19th June 2010, 08:54 PM   #1
sblack6 is offline sblack6  United States
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Default Lighternote attenuator

Has any one built one of these? I bought the kit and put it together. . .works and sounds good except at lowest volume I am getting sound. . .I set it up exactly as the instructions indicated. Any suggestions would be appreciated. Thanks.
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Old 19th June 2010, 09:54 PM   #2
Zen Mod is offline Zen Mod  Serbia
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and that is ?
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Old 19th June 2010, 10:03 PM   #3
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and that is ?
A attenuator using LDRs... sort of similar to this one:

Poor Serbian Man Optical Volume Control

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Old 20th June 2010, 05:04 AM   #4
Variac is offline Variac  United States
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OK, ZM will be expositing more about his PSMOVC in a couple of days.. hint hint.
Your patience will be rewarded choky!

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Old 20th June 2010, 07:33 AM   #5
Blues is offline Blues  United States
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Quote:
Originally Posted by sblack6 View Post
Has any one built one of these? I bought the kit and put it together. . .works and sounds good except at lowest volume I am getting sound. . .I set it up exactly as the instructions indicated. Any suggestions would be appreciated. Thanks.
I have a rather very simple solution (IMHO elegant too ) to this...I'll not reveal it just yet though, sorry.

ZM's PSMOVC might be able to do it too...Choky?
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Old 20th June 2010, 09:26 AM   #6
Zen Mod is offline Zen Mod  Serbia
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Originally Posted by Blues View Post
I have a rather very simple solution (IMHO elegant too ) to this...I'll not reveal it just yet though, sorry.

ZM's PSMOVC might be able to do it too...Choky?
joy isn't in having it ...... joy is in developing another boiled water specimen

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Old 20th June 2010, 10:32 AM   #7
Bernie7 is offline Bernie7  Singapore
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Quote:
Originally Posted by sblack6 View Post
Has any one built one of these? I bought the kit and put it together. . .works and sounds good except at lowest volume I am getting sound. . .I set it up exactly as the instructions indicated. Any suggestions would be appreciated. Thanks.
There is a bit of sound at minimum volume because the shunt LDRs cannot be set to 0R at minimum volume as otherwise they will overheat. This will sound louder or softer depending on your source output, amp and speaker efficiency. It will also depend on the lowest shunt resistance you set, which should be less than 70R and greater than 50R. It will help if your series LDRs are set to some high resistance >10k at minimum volume.

In my Lighter Note and 88dB speakers this doesn't bother me as I always leave the volume control in my listening range (9 - 11 o'clock). It's a small price to pay for the quantum jump in sonics.
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Old 20th June 2010, 04:42 PM   #8
Blues is offline Blues  United States
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You are right Bernie7...on some amps though with higher gain or speakers with greater sensitivity, <70R and >50R might not be enough.

Right you are too Choky...mere mortals only have inspirations.
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Old 21st June 2010, 02:59 AM   #9
Bernie7 is offline Bernie7  Singapore
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Can also try adding a resistor of say 10k to the series LDR to reduce min volume level. This will reduce the entire volume range as well.

Not sure if this will affect SQ since it adds an extra part to the signal path, a non-LDR part at that
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Old 21st June 2010, 03:33 AM   #10
Blues is offline Blues  United States
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Not a welcome addition for some of the purists out there especially that it's on the signal path...
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