diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Analog Line Level (http://www.diyaudio.com/forums/analog-line-level/)
-   -   Lighternote attenuator (http://www.diyaudio.com/forums/analog-line-level/168899-lighternote-attenuator.html)

sblack6 19th June 2010 07:54 PM

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.

Zen Mod 19th June 2010 08:54 PM

and that is ?

Greg Erskine 19th June 2010 09:03 PM

Quote:

Originally Posted by Zen Mod (Post 2221384)
and that is ?

A attenuator using LDRs... sort of similar to this one:

http://www.diyaudio.com/forums/analo...?highlight=LDR

:D

Variac 20th June 2010 04:04 AM

OK, ZM will be expositing more about his PSMOVC in a couple of days.. hint hint.
Your patience will be rewarded choky!

Mark

Blues 20th June 2010 06:33 AM

Quote:

Originally Posted by sblack6 (Post 2221338)
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?

Zen Mod 20th June 2010 08:26 AM

Quote:

Originally Posted by Blues (Post 2221684)
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

:clown:

Bernie7 20th June 2010 09:32 AM

Quote:

Originally Posted by sblack6 (Post 2221338)
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.

Blues 20th June 2010 03:42 PM

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.

Bernie7 21st June 2010 01:59 AM

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 :rolleyes:

Blues 21st June 2010 02:33 AM

Not a welcome addition for some of the purists out there :nownow: especially that it's on the signal path...


All times are GMT. The time now is 02:06 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2