Lightspeed Attenuator a new passive preamp - Page 353 - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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
Reply
 
Thread Tools Search this Thread
Old 25th August 2010, 02:20 PM   #3521
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
You'll throw the impedance matching out the window if you use a voltage divider.
Best to lower the gain of the cdp or the amp. Via their feedback networks.
Cheers George
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 25th August 2010, 02:21 PM   #3522
diyAudio Member
 
Join Date: Nov 2008
Quote:
Originally Posted by georgehifi View Post
You'll throw the impedance matching out the window if you use a voltage divider.
Best to lower the gain of the cdp or the amp. Via their feedback networks.
Cheers George
Hmm, on consideration, that probably applies to the single series resistor as well.

Last edited by wapo54001; 25th August 2010 at 02:34 PM.
  Reply With Quote
Old 28th August 2010, 09:54 PM   #3523
diyAudio Member
 
LucasAdamson's Avatar
 
Join Date: Feb 2009
Has anybody successfully integrated one of these into their lightspeed attenuator?

Remote Control

I ask because I am hoping to integrate a remote control pot that does not affect the signal path purity, and a combination of this and the lightspeed would seem to be just that. The remote pot would control the Vdc of the leds, nothing more. The switcher is just by relays, controlled by some nasty non-audio grade electronics that is isolated from the signal path.
__________________
Lucas
  Reply With Quote
Old 28th August 2010, 10:11 PM   #3524
udailey is offline udailey  United States
diyAudio Member
 
Join Date: Mar 2008
Hi Lucas
I think quite a few have used this. Skip the relay part for signal purity.
__________________
purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com
  Reply With Quote
Old 28th August 2010, 10:13 PM   #3525
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
I friend ask me the same question and to maybe make it an opinal extra for my production Lightspeed Attenuator, I said my product is so reliable I have never had one back yet for repair or service out of hundreds around the planet, do you think it will stay that way if I put this into it?
For the indivdual to do it themselves it's fine so I said to him to get it for himself, and gave him some pointers below.
You need to make sure that the pot is log not lin, also you will have to do some surgical work to the pot board as it is meant to be a replacement for normal volume controls not the Lightspeed, as it works as you probally know totally different.
I wouldn't use the input swicthing board either as I have heard those relays in the siganal path compared to going direct. And the you will aslo need 12acv for this motor drive so you will need another wall wart. And last thing is how long will that remote last? and are they going to be available in the future?
Cheers George
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 28th August 2010, 10:50 PM   #3526
diyAudio Member
 
LucasAdamson's Avatar
 
Join Date: Feb 2009
Are you dismissing relay based input switchers in general or these in particular?

I ask because I have a much higher quality relay switcher, that uses 12v triggered relays that have gold plated silver connectors that mate perfectly, and keep the signal path much shorter than a rotary switcher, which has small and usually lousy alloy spring connectors.

I use several sources, primarily Vinyl, DAC and Tuner, so I need a switcher of some sort.
__________________
Lucas
  Reply With Quote
Old 29th August 2010, 12:07 AM   #3527
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
I have even tried what's considered the best, mercury based relays, and gold plated contact, they can all be heard to have a slight detriment compared to direct connection, as they are all a light pressure contact, unless you get some 50amp jobs they have stronger pressure contact but are huge in size and maybe not available in gold plate, and there are some silver contact ones, also but remember silver tarnishes very quickly.
Cheers George
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 29th August 2010, 08:51 AM   #3528
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
The discussion here seems to be going along the line of
single direct input for best quality
or
multiple relay connected inputs at reduced quality
or
multiple switched inputs with longer wiring at reduced quality

It is very easy to make a decision in which camp one needs to be in.
__________________
regards Andrew T.
  Reply With Quote
Old 29th August 2010, 10:10 AM   #3529
jonners is offline jonners  United Kingdom
diyAudio Member
 
jonners's Avatar
 
Join Date: Jan 2007
Location: Cheltenham
Quote:
Originally Posted by LucasAdamson View Post
Has anybody successfully integrated one of these into their lightspeed attenuator?

Remote Control

I ask because I am hoping to integrate a remote control pot that does not affect the signal path purity, and a combination of this and the lightspeed would seem to be just that. The remote pot would control the Vdc of the leds, nothing more. The switcher is just by relays, controlled by some nasty non-audio grade electronics that is isolated from the signal path.
I'm using one of these with a udailey board and I'm very happy with it . I'm not using the input switching board. To use the control board you have to cut some earth traces on the pcb. Take a look here:Optical Volume Control Professional PCB
  Reply With Quote
Old 29th August 2010, 12:01 PM   #3530
diyAudio Member
 
LucasAdamson's Avatar
 
Join Date: Feb 2009
Quote:
Originally Posted by jonners View Post
Great! Thanks for that! Just the link I needed.
__________________
Lucas
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 07:34 AM.


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