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Old 17th March 2012, 01:09 AM   #4461
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Quote:
Originally Posted by udailey View Post
George obviously sells the Lightspeed but he doesnt try to sell it here, only describe it to DIYers and help them build their own.
"
Well everyone is happy then. , as long as the same demonstrated freedoms including use of thread name, product names, avatars are available to all members.... and this is i think is a question for moderators to answer.

Cheers / Chris


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Last edited by Chris Daly; 17th March 2012 at 01:17 AM.
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Old 17th March 2012, 01:52 AM   #4462
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Old 17th March 2012, 01:55 AM   #4463
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How did I know a couple of days ago where this would end up.
The moderators are watching, please do not get this thread shut down.
If anyone wants to try a different way of doing things, Nelson Pass spent a bit of time doing different things for the Lightspeed Attenuator a few years ago with no though of monitory gains and had my thanks and others as well.
Here are two ways he did things both had a buffer, I omitted it one of the diagrams.
Please feel free to use them personally, but remember they are protected and do not try to make them a financial going concern, as from what I've read and seen Nelson Pass does not like cloners who try make money on his designs, and he has the legal people to back it up.

Cheers George
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Old 17th March 2012, 04:27 AM   #4464
BFNY is offline BFNY  United States
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It's best to remember that brief off topic is allowed here.

And moderation duties/ advice / guidance are best left to the moderators.

As a long time founder and moderator of another fairly large audio group that just celebrated 10 years, I can share something.

Moderators really don't want to interrupt good audio oriented discussion.
Usually, they only feel the need to do something when people start getting personal / attacking other people. As long as posting contributors are fairly focused on audio discussion, polite, or even somewhat impersonal, all is cool. Everyone is trying to contribute to the discussion, in their own way. Let it be.

And many thanks to George for posting his design, and contributing here over the long haul. It's a great design, which has spurred many innovations and offshoot designs. Most of which, were initially posted here in this thread. Very cool.

Now, off to have some more green IPA
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Old 17th March 2012, 01:41 PM   #4465
AndrewT is offline AndrewT  Scotland
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I was thinking, but had not yet acted on Udailey's concern.

So I ask the question:
Is current control sufficiently different from the Lightspeed that detailed discussion of the topologies to achieve current control should be discussed in a separate thread?

I vote for a new Thread.
And ask for the relevant posts to be copied across to the new thread.
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Old 20th March 2012, 11:40 PM   #4466
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SPICE Model for NSL32SR3


.SUBCKT NSL32SR3 1 2 4 5
RIN 4 6 1
VT 6 5 0
GRES 1 2 VALUE = {V(1,2)/(97.7+(29970*((V(4,5))^1.5))+(0.1976/(V(4,5)))-(6780*(V(4,5))))}
.ENDS
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Old 31st March 2012, 10:23 PM   #4467
fotios is offline fotios  Greece
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LIGHTSPEED attenuator conversion to remotely controllable unit. A quite easy work, just one 4.5mm hole on the front panel for the IR receiver.
PCB compatible with less expensive motorized potentiometer: BOURNS (Mouser price: 9.5 Euro).
Here the link for a detailed description of remote control unit: http://www.diyaudio.com/forums/analog-line-level/207419-remotely-controlled-motorized-volume-pot.html
Please don't take it as advertisement, schematics and PCB drawings and above all the program code in hex format (to be compatible with any type programmer) are offered FOR FREE.
Thank you!
Attached Images
File Type: jpg LightSpeed_1.jpg (282.3 KB, 317 views)
File Type: jpg LightSpeed_2.jpg (170.5 KB, 297 views)
File Type: jpg LightSpeed_5.jpg (308.7 KB, 295 views)
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Old 1st April 2012, 03:05 PM   #4468
udailey is offline udailey  United States
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I think its pretty great and nice for you to provide the code for those that would like to build it themselves. This should work on any Lightspeed, original or DIY, that takes a 100k pot.
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Old 2nd April 2012, 08:49 PM   #4469
fotios is offline fotios  Greece
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Quote:
Originally Posted by udailey View Post
I think its pretty great and nice for you to provide the code for those that would like to build it themselves. This should work on any Lightspeed, original or DIY, that takes a 100k pot.
Good for me, much better for you! The program code and the circuit are of professional level - tried and tested on actual devices 6 months so far without any problem - and may well be used in any commercial product. Anyway, since it was shared free, the code is "burned" IMHO. Despite all this, can be used in any project where the 4 basic remotely controlled functions (VOL+, VOL-, MUTE, STBY) are applicable. The brand and the value of potentiometer does not matters. Here the direct link to the project description and code in HEX:

Matrix Multimedia user forums • View topic - Remotely Controlled Motorized Volume Pot.

Enjoy!

P.S. BTW, i have ready a program code for a mini remote control handset of high quality with just 4 buttons to complement the whole project. Exactly like this on the picture. No more use of remote control handsets cluttered from 20 or 30 or 40 buttons! I am in the process of drawing a new PCB, because recently i received samples of some last generation PICs and i feel obliged to try these. HEX code, circuit and PCB drawing, very soon available for free!
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Last edited by fotios; 2nd April 2012 at 08:54 PM.
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Old 2nd April 2012, 10:53 PM   #4470
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Glad it got to you safe and sound it's a long way from Australia to Greece, thanks for doing such a professional job on Johns new Lightspeed Fotios, he will be pleased when you forward it to him in freezing Norway, and if I decide to go remote with the production version I will be sure to contact you, it's far better than some of the rubbish available.
I have something in the oven for a Lightspeed Attenuator no expense spared version with your remote with contactless input switching, volume setup, balance and active unity/+6db gain buffer for those who need it or passive for the purists as it is now, contactless all the way through from input to output.

Cheers George
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