DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 22 Oct 2018, 12:48

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 36 posts ]  Go to page Previous  1, 2, 3, 4  Next
Author Message
PostPosted: 26 May 2009, 10:06 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 20:12
Posts: 972
Location: Houston, TX
My next project will be to build an RCA cable with LDRs built into it and a separate power supply. Keep watching :)
I am using Eichmann Silver Bullets and they are hollow which gives me room to store the LDRs in. So it will look like a normal set of RCA cables with a power inlet.
Ri

_________________
DIY Lightspeed Passive Attenuator


Top
 Profile  
 
PostPosted: 26 May 2009, 12:17 
Offline
Editor
User avatar

Joined: 28 May 2008, 21:53
Posts: 4565
Location: Winnipeg, CANADA
I like that idea! What will you use to house the circuit?

_________________
[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


Top
 Profile  
 
PostPosted: 26 May 2009, 13:05 
Offline
Project Author
User avatar

Joined: 06 Jun 2008, 20:12
Posts: 972
Location: Houston, TX
Dunno. Been scratching my head on that one for a while. Small and light? It moves around to much. Heavy as in a block of aluminum? Lots of work. Probably a small project box or something neat looking from ebay.
Ri

_________________
DIY Lightspeed Passive Attenuator


Top
 Profile  
 
PostPosted: 26 May 2009, 20:03 
Offline
Editor
User avatar

Joined: 28 May 2008, 21:53
Posts: 4565
Location: Winnipeg, CANADA
I think those small black ABS enclosures at Radio Shack would work well and look ok too,

Boxes and wooden blocks and boxes are not all that uncommon on speaker cables.

Image

Image

_________________
[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


Top
 Profile  
 
PostPosted: 11 Sep 2010, 01:02 
Offline

Joined: 11 Sep 2010, 00:59
Posts: 1
Has anyone attempted a balanced Lightspeed yet?


Top
 Profile  
 
PostPosted: 25 Sep 2010, 11:20 
Offline

Joined: 20 Jan 2010, 13:28
Posts: 3
Has anyone tried a remote control setup?
Thanks
Bob


Top
 Profile  
 
PostPosted: 18 Oct 2011, 14:06 
Offline

Joined: 18 Oct 2011, 13:15
Posts: 2
Hi,

I got here after a long search and registered.
It's quite a long story to tell want I want, but I will try to keep it short (I possibly will not succeed in that)

After building a few other sets of speakers I decided to build the Linkwitz Pluto's (see: www.linkwitzlab.com)
Those Pluto's have active filters and built-in power-amps. Maybe it was not wise of me to build the poweramps actually in the cabinets of the speakers and in fact I didn't yet, but I still want them there.

I was looking for a matching pre-amp that I can operate with a remote. Then I came across passive pre-amps and got interested. But I still want remote control for the source and for the volume-setting. I do not use an LP-player, just modern things like CD/DVD and a computer combined with a rather good chinese USB-DAC (with headphone and therefor pre-amp), so my input voltages should be no problem to a passive pre-amp.

However, my problem is I have all equipment physically in the middle of my speakers. This means from my passive pre-amp to any of the speakers is about 2.5 meters (say about 8.3 feet). Using the best (self-built) cables this still means I have long inter-connects to the poweramps that are built in the speaker-cabinets. So I was looking for a solution to that. I would rather not first weaken my signal in the passive pre-amp in the middle and have all distortion on the rather long cables fully amplified by the amps in the speaker-cabinet. I would like the weakening in the speaker-cabinet itself so all distortion on the cables is weakened as well. But I also would like remote control on volume and inputs. The inputs selection can be on the passive pre-amp in the middle of my set-up.

And there are all sorts of rather price-worthy remote-controls on e-bay, all chinese that is.
What if I use one of those POT-driven remote-controls to drive the POT on the passive pre-amp, but make an extra wire to the speaker-cabinets and build the LDR circuit into the pluto-speakers? My losses on the signal can be very low and I am still able to remote control the whole thing. Or am I now mistaken? Not seeing things clear?

kind regards.


Top
 Profile  
 
PostPosted: 10 Nov 2011, 15:24 
Offline

Joined: 18 Oct 2011, 13:15
Posts: 2
Hi all,

I was thinking of combining the LDR with some chinese/HongKong remote volume control based on a motorized POT, like http://www.ebay.de/itm/110672789815

I am planning to use the motorized POT as the 100K stereo POT that regulates volume in the LDR.
Furthermore I can also choose the channel remotely.

I came to this solution because I am building the Linkwitz Pluto´s and I already choose to build the power-amps in the stands/feet of the speakers. This means I will have long interconnects between the passive preamp and the power-amps in the speakers (2.5 meters/8 feet). I reccon it will be better to build the LDR's in the speakers . In this way I will not only lower the sound-signal, but also the noise that is picked up by the long interconnects. It does mean however that I will need a third cable running to each of the speakers (power cable, interconnect and cable from the POT), but I don't care about the extra cables.

What do you guys (or girls) think of this solution?

regards,

Czar.


Top
 Profile  
 
PostPosted: 14 Nov 2011, 13:16 
Offline
Editor
User avatar

Joined: 28 May 2008, 21:53
Posts: 4565
Location: Winnipeg, CANADA
Hi Czar. That sounds like it should work. Lets us know how you make out.

_________________
[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


Top
 Profile  
 
PostPosted: 31 Dec 2011, 14:38 
Offline

Joined: 30 Nov 2010, 15:35
Posts: 22
i was thinking about building this project but seems like not many have tried it even though it's been out there for a while. i've had really good results with alps and higher grade pots in passive attenuators used with tube power amps. will this project be really an upgrade from such volume control?

so, from http://buildanamp.com, i should order the $43 kit and it will include the matched optocouplers, boards, and all parts? i mean everything i need other than the rca, power supply, and chassis?

another question is for the power supply, can i use LM317 instead of LM78? maybe with a trimmer? i have a bunch of them left over from last project.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 36 posts ]  Go to page Previous  1, 2, 3, 4  Next

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 5 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy