Warpspeed -An Optocoupler Volume Control - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Vendor's Bazaar

Vendor's Bazaar Commercial Vendors large & small hawking their wares

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 8th November 2010, 05:32 AM   #1
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
Default Warpspeed -An Optocoupler Volume Control

The Warpspeed came about to address some of the shortcomings of current LDR volume controls. On the list are:

-the inability to adjust to complete silence
-on low/high volume level settings, power levels on the LEDs endanger/shorten/toast the life out of the optocouplers
-the need to improve the power delivery to the optocouplers
-the need to improve on quality of the volume adjustment pot
-the Lightspeed, simple as it is, still has a number of variables/design factors that affect performance

The Warpspeed solves the above and then some. Added bonus are:

-low volume levels are more engaging and equally enjoyable (ie. the music details are as much as when at moderate/loud levels)
-low volume listening is perfect in conjunction with NP's monotonic amps -decreasing distortion at lower audio levels (might explain above experience)
-wider range of volume level settings
-battery power means less ac power related artefacts on optocouplers
-precise power delivery and control at safe levels on optocouplers
-by design keeps optocouplers' power level ratio at/near equilibrium
-peace of mind at any volume level

Forgive me for what may sound like a controversial choice of name...some of Star Trek's storylines are still controversial and significant to this day.

More to come soon...
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 8th November 2010, 05:34 AM   #2
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
Initial discussion started here A better formula for Silonex LDR's and in some of the other LDR related threads...
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 12th November 2010, 02:17 PM   #3
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
For your weekend reading pleasure, hopefully. The theme is my amateur attempt not to bore readers... I also felt some members thought this was fiction
Attached Files
File Type: zip FTL -Fiction or Fact.zip (383.8 KB, 1040 views)
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 13th November 2010, 04:37 AM   #4
diyAudio Member
 
Join Date: Mar 2007
Location: California
Dark matter/antimatter???

How about posting a plot of distortion versus attenuation at 1V signal level. That should get to the heart of the dark matter in your new LDR attenuator.

Here is a link to a post on this forum from Nelson pass, on the distortion of the popular lightspeed attenuator at 1V:
Lightspeed Attenuator a new passive preamp

So far, I am not impressed.

-Charlie
  Reply With Quote
Old 13th November 2010, 06:58 AM   #5
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
So far, I am assuming, you have not built one (any variant is easy enough) and given it a listen...maybe numbers don't tell the whole story? I also see you're not a Star Trek fan?
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 13th November 2010, 04:11 PM   #6
diyAudio Member
 
Join Date: Mar 2007
Location: California
No, haven't built one, and don't plan on it.

I don't really see the advantage of building a volume control that adds distortion, sometimes a lot of it. All the so called "advantages" of the LDR based attenuators, like no contact noise, having an "off" position, etc. don't make up for that deficiency in my opinion.

So, if your warpspeed bridge design can address the distortion issue, that would be a huge advance for these sorts of controls. Please consider measuring and posting info on distortion so that a fair comparison can be made.

-Charlie
  Reply With Quote
Old 13th November 2010, 06:42 PM   #7
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
If you get a chance please do build one. I'm speaking for myself here, but I know there are others out there and I was a doubting Thomas too until I decided it's too simple to pass on building it. It is ridiculously amazing the way the music ebbs and flows! Distortion is really that good? I haven't come across anyone who have tried and not like it soundwise.

Once you have one built, and it doesn't have to be a Warpspeed, then listen. Let us know if you are able to tell the x amount of distortion there. Then please measure...

Down the road will do...
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 14th November 2010, 09:52 PM   #8
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
I usually evaluate a new component inserted in my system, which I have for the past 6 years -speakers at 10, by listening to familiar music. Physical and emotional responses I take mental notes on can be -tight, clenched jaw/teeth or relaxed with eyes closed; ear fatigue or not after half-hour of listening at moderate to loud levels; tapping of feet/hands/fingers and even getting up to bust some moves; tightness/rhythm of bass lines and sparkle of highs compared to past listening; addition of microdynamics never heard before; soundstage definition at listening sweet spot and to about 2ft from and center of stereo speakers; low level listening and noting difference; ability for long-term listening and enjoyment; moving about within the house and listening; watching a movie with the system and noting slam-bang abilities, and dialogue -usually a system that performs well with music does well with movie soundtracks too.

I'm happy to say, for almost a month now, the Warpspeed does all the positives with the added bonus of low power battery and zero noise operation; zero turn-on thumps with bi-amps powered on; and true volume control capabilities. I'm tempted to conclude CD sound was given a bum rap after all these years...after my pre-amp was taken out of the signal chain, listening has become a lot more easy-going with a lot more music/lyric clarity and definition...
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 15th November 2010, 03:20 PM   #9
maxw is offline maxw  United Kingdom
diyAudio Member
 
maxw's Avatar
 
Join Date: Jun 2004
Location: London
Quote:
Originally Posted by Blues View Post
-on low/high volume level settings, power levels on the LEDs endanger/shorten/toast the life out of the optocouplers
Can you elaborate on this? Why is this so when the devices tolerances are adhered to? Just curious....

Also, why don't you mention the input/output impedance issues too? ie source impedance has to been less than 100Ω, amp impedance more 50kΩ etc.
  Reply With Quote
Old 15th November 2010, 05:23 PM   #10
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
Quote:
Originally Posted by maxw View Post
Can you elaborate on this? Why is this so when the devices tolerances are adhered to? Just curious.....
This issue is with the Lightspeed and some of the other variants that followed. Not the case with the Warpspeed.

[/QUOTE]Also, why don't you mention the input/output impedance issues too? ie source impedance has to been less than 100Ω, amp impedance more 50kΩ etc.[/QUOTE]

I have tried a couple of Toshiba CD/DVD players with a quoted output impedance of 200Ω and 220Ω (2Vrms max); and two Sony - one an SACD/CD and another Blu-ray/DVD/CD, both at 10k (2Vrms max) on the specs. It did not make a difference in performance ie. listening levels were still from 9:00 thru 3:00.
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html

Last edited by Blues; 15th November 2010 at 05:23 PM. Reason: edit
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Volume control on DVD player remote. Lose resolution at low volume? Circlotron Digital Source 2 10th June 2011 07:20 PM
CDM-4/19 running at warpspeed Pharao.Pharao Digital Source 13 5th May 2008 12:43 PM
i need preamp schematics w/o tone control or volume control hernanstafe Parts 7 30th January 2008 03:12 AM
The remote control paratactic volume control audio-gd Solid State 33 7th June 2007 11:16 PM
remote control motorised control for volume pot/knob CharlesY Parts 0 25th July 2005 11:12 AM


New To Site? Need Help?

All times are GMT. The time now is 12:46 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