DIY Lightspeed Attenuator Passive LDR Volume Control ... The Lightspeed Passive Attenuator designed by George Stantscheff (GeorgeHiFi on the audio forums) is by far the very best passive attenuator that I have heard. There is perfect clarity, a widened soundstage, separation of instruments, and seemingly infinite detail. DIY Lightspeed Passive Attenuator DIY Audio Projects The Lightspeed Passive Attenuator uses optocouplers to establish the level control and this is done with no "contact points" through the attenuator. The optocoupler is a LED and Light Dependent Resistor (LDR) is one housing. The operation principle of the Lightspeed is simple by adjusting the intensity of the LED you can change the resistance of the LDR. DIY Lightspeed Attenuator Passive LDR Volume Control ... More signal meant more light from the panel (or LED in some cases), lowering the resistance of the LDR. The control limit tube is usually in a feedback loop and the panel LDR are at the input. The characteristic sound of the opto coupler attack delay made them really popular alternatives to the huge an expensive variable mu compressors like the Fairchild 670. Lightspeed Attenuator "LDR" Volume Controls I love the possibilities of something like that. I have a 100 step remote controlled attenuator I bought from Hong Kong a few years back. I have been contemplating the idea of using the relays & resistors to control a variable current source so the LDR's would be driven via a CS vs the variable resistor in the current setup. Passive Lightspeed Attenuator Pre Amplifier DIY | DASK ... It has a wide rich sound stage that you can get from a good active pre amp, esp tubes. Most 'pot in a box' step attenuator passives are detailed but always sound small, lacking energy and scale were the LDR lightspeed has the passive detail but with the width and organics of an active. Really unexpected. Lightspeed Attenuator DIY DIY Audio Projects StereoNET 2nd: Is the Lightspeed Attenuator stereo version, complete circuit diagram, note how the signal goes through nothing but one soldered resistor, no sound robbing light contact of a metal wiper on a resistive track of a volume control (potentiometers) or source switchning in the signal path. LDR volume control A passive preamp aka Lightspeed ... LDR volume control A passive preamp aka Lightspeed Attenuator. I am aware of the above for quite sometime now.. Have read with interest and somehow it (the interest) 'flame out' for no reason.. maybe I'm 'not in the mood' as usual.. The thread at diyaudio can be found here. parison Lightspeed DIY LDR Pre VS Stereo Coffee DIY ... There are hundreds of posts about George Stancheff’s Lightspeed preamp that uses LDR’s. I was eventually led to schematics of the Mk2 version which George generously placed in the public domain and it looked quite simple apart from having to match LDR’s. DIY Audio Projects Forum • Lightspeed Attenuator Audiohm ... 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. DIY Audio Projects Forum • Lightspeed Attenuator Audiohm ... Hello All I've now put one of these together, and am very pleased with the results, The only problem appears to be a massive increase in volume when I turn my amp off (I've plumbed it into my KT88 valve amp, and it runs off the heater supply), until the caps run dry. LIGHTSPEED ATTENUATOR diy Art of Sound Forum Hi guys, if you can hold a soldering iron and solder and have a small amount of electronic knowledge you can make a Lightspeed Attenuator yourself. Yes I also do a production ready made Lightspeed Attenuator over 800 units world wide now, which was released at the same time as I put up the diy version. What is a very simple idea I started back in the 1960's, can't be improved on, no matter ... DIY LDR Pre amp kit. Vinyl Engine The LDR kit is a passive circuit, it has no gain which we then term as a passive attenuator. If we added gain, which is quite easy with a buffer circuit, we then add distortion and the sound would then have a signature to it. support for multiple channels DIY Lightspeed Passive ... The Lightspeed Passive Attenuator uses optocouplers to establish the level control and this is done with no "contact points" through the attenuator. The optocoupler is a LED and Light Dependent Resistor (LDR) is one housing. The operation principle of the Lightspeed is simple by adjusting the intensity of the LED you can change the resistance ... Lightspeed Passive Attenuator DIY Project | EEWeb munity The circuit was designed to create a volume control with the use of optocouplers to produce a lightspeed passive attenuator. An optocoupler is a sealed device unit which has high performance LED that illuminates on a light dependent resistor (LDR) where the intensity of the LED determines the volume. DIY Audio Projects Forum • Lightspeed Attenuator Audiohm ... Update: Here are Uriah's detailed instructions for building a DIY Lightspeed Passive Attenuator (11 May 2009) I got a set of matched Silonex NSL 32SR2 Light Dependent Resistors (LDR) from RiGuy who also sent me a PCB for the "Lightspeed Attenuator". Thanks Ri! This will be a build log and some listening notes. LDR (Light Dependent Resistor) Volume Control Audio ... LDR (Light Dependent Resistor) Volume Control Sign in to follow this . Followers 5. ... SKA Audio sells LDR volume controls here. I have never personally used one, but quite a few DIY'ers have used them in their Millett Maxes, and many report good results. ... Lightspeed Attenuator a new passive preamp Page 1. Share this post. Link to post The Evolution of LDR Volume Control | Tortuga Audio In Q2 2017 Tortuga Audio released its fourth generation LDR technology which is included in all of our current passive preamp products. Tortuga Audio’s LDR technology moves beyond the old challenges of integrating LDRs into audio volume control. For those who like to look under the hood, here is a brief review of the evolution of LDR volume ... JazTech Audio: Lightspeed Attenuator LDR Volume control ... Lightspeed Attenuator LDR Volume control reading time! I have been reading the thread at diyaudio since yesterday, stopped at page 45 out of 80 (I think). Hell! 3 Input OR Gate Truth Table in 2019 | Nand gate, Gate ... ‪#‎JFET‬ amplifier (junction gate field effect transistor) is the simplest type of field effect transistor. That can be used as electronically controlled switches, amplifiers, or voltage controlled resistors. Find this Pin and more on Electronic Circuits by Edgefx Kits. Lightspeed Attenuator Best Preamp Ever? | Audiogon ... The Morrison Elad is just a normal active preamp using normal pot and a 50 cent Analog Devices AD797 opamp with no gain. It has nothing what so ever in similarity to the Lightspeed Attenuator and it has nothing what so ever to do with LDR's or LED's. DIY Audio Projects Forum • Lightspeed Attenuator Audiohm ... Lightspeed Attenuator Audiohm Optocouplers LDR. Page 3 of 4 [ 36 posts ] Go to page Previous 1, ... And Lightspeed Passive Attenuator was reduced it much more. I just using 18 Volt battery as source. ... My DIY Optocouplers Next time I put it on the casing for finishing touch. _____ Lighter Note LDR attenuator Art of Sound Forum Lighter Note LDR attenuator After first finding out about LDR (light dependant resistor) based attenuators a year or so ago I decided I simply must give one a try. After doing some research I stumbled across the Lighter Note which is an evolution of the Lightspeed Attenuator and addresses all of the weak points of the original's design. diyAudio Lightspeed Attenuator a new passive preamp 2nd: Is the Lightspeed Attenuator stereo version, complete circuit diagram, note how the signal goes through nothing but one soldered resistor, no sound robbing light contact of a metal wiper on a resistive track in a volume control (potentiometers) in the signal path. Review of Lightspeed Attenuator XtremePlace LS did no active advertising and I am ashamed to admit that as a self proclaimed audiophile for 20 years I chance upon the LDR circuitry in a diy forum only recently while seeking to improve my channel imbalance with the Alps variable resistor swipe type volume control. LDR Active Preamp does it exist? | Audiogon Discussion Forum LDR Active Preamp does it exist? I am using passive LDR (Light Dependent Resistor) volume control LightSpeed Attenuator. As much as clarity and all the good stuff about this little preamp, I wish I can have some gain for my low sensitivity amplifiers. 6moons audio reviews: Warpspeed V8xW1 The Lightspeed attenuator promoted by George Stantscheff has opted to not incorporate it. Allan Flores meanwhile concedes Pass' point and set out to address it in his own way. Enter the Warpspeed Control Engine©. It began as pure DIY project but now is an à la carte turnkey product with many built to order options. Lightspeed Attenuator Stereo Amplifiers & Pre Amps ... The Lightspeed Attenuator is, as the name suggests, an attenuator. A passive preamp. All it does is transfer the signal – and give you the capacity to turn the volume down (attenuate). Also as the name suggests, attenuation is done by the use of light. Turning the volume control up or down decreases or increases the resistance of the internal ... Lightspeed Attenuator (build yourself). DIY HiFi WigWam Yes the Dartzeel NHB 18NS does use the LDR volume control also, in fact they tried to patent it, which couldn't get passed because I first started using it back in the 70's for volume control duties. What's Wrong With Audio Volume Control? | Tortuga Audio What Is Volume Control? Whether you own $10k of high end gear or a humble $200 receiver from Best Buy, chances are about 100% that every note of recorded music played through your system is funneled through a volume control device (a.k.a. an attenuator) before it reaches your ears. Slagle AVC Modules & Lightspeed Attenuator Slagle AVC Modules & Lightspeed Attenuator Recently I’ve been fortunate to be in possession of two excellent passive preamps that won’t break the bank, in fact far from it. The following comments are based on some observations I made when listening to and comparing the Slagle Autoformer Modules to the Lightspeed Attenuator. LightSpeed Attenuator vs. GoldPoint SA1X | Audiogon ... But this can be desctructive over time to the led ldr's (as I stated in the Lightspeed diy thread linked) and then it can also lead to not having a very low lowest level volume. Like revving your car passed it's redline all the time, something's got to give after a while. Lightspeed Attenuator Best Preamp Ever? | Audiogon ... The Lightspeed attentuator is the first passive volume control that adds real dynamics to the mix regardless of the listening volume. I've had this said many times back to me by Lightspeed Attenuator owners, and asked by them why this is so. These are my beliefs. Try to stay with me with my explanation below.

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