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Old 24th April 2008, 07:25 AM   #1271
kp93300 is offline kp93300  Malaysia
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Default remote control LS clone

Hi ed linssen

"Btw the remotecontrolething I did I can advice to anyone. It's the Remote1 with the 16-Alps motorpot. From: Dantimax."

Can you post a picture of this and indicate which modules of the kit you bought from Dantimax.
I am confused by the Dantimax website

I have also built the Lightspeed clone and is truly impressed. It bring the musician into the room !
I think we should nominate georgehifi as diy hi fi personality of the year if there is such a thing.

Thanks in advance.

kp93300
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Old 24th April 2008, 09:35 AM   #1272
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Default Re: remote control LS clone

Quote:
Originally posted by kp93300
Hi ed linssen

I have also built the Lightspeed clone and is truly impressed. It bring the musician into the room !
I think we should nominate georgehifi as diy hi fi personality of the year if there is such a thing.

Thanks in advance.

kp93300
Oh shucks, your my new best friend



Cheers George
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Old 24th April 2008, 01:30 PM   #1273
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Hi 93300,

Things I got from Mikkel,: " info@dantimax.dk" are:

Rem1 kit
Alps RK16 log motorpot 100K
And if you don't have it he sells cheap 12V dc wallwarts for powering the remote.
The codes he uses are the one's used by Philips on all his stuff.
RC5 code.
The hand-controlepart you can buy from him too for I think 5euros.

Succes and keep your ears up and open.

Ed
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Old 24th April 2008, 03:04 PM   #1274
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I bought one of the remote kits from DIY Club. It was the 100K model using the Alps motorized pot. The PC board was designed to take a 12 volt DC signal and regulate it down to 5 volts for the pot. I just bypassed the 12 volt input and applied 5 volts from my Lightspeed supply. I then removed the solder on the pot signal pins and cut out the PC board area around them with a dremel. This allows you to isolate the pins for the rest of the circuit. Now wire up the correct pins like George had designed running 5 volts to them.
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Old 29th April 2008, 07:17 AM   #1275
Tolu is offline Tolu  Germany
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Built and tested OptiVol for 31 AU$! Wow! And I was measuring the best pairs out of 12 and spending a whole evening and this guy gives it away for that lousy amount of money! Great!
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Old 29th April 2008, 10:09 AM   #1276
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Quote:
Originally posted by Tolu
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Built and tested OptiVol for 31 AU$! Wow! And I was measuring the best pairs out of 12 and spending a whole evening and this guy gives it away for that lousy amount of money! Great!
As I have stated before this was the same way (series resistor/ shunt ldr MKI) I built the first MKI Lightspeed Attenuator around some 35 years ago, and the start of the production Lightspeed Attenuator a few years back.
It works but it's performance/sound quality is considerably down on the on the (series ldr/shunt ldr MKII) system.
Bass is tighter and overhaul more transparent and dynamic on the MKII version. The MKI sounds very much like a good old school tube amp, a bit soft, thickish in the bass and bit veiled and lacking in dynamics and transparency, but comfortable.
This is why all my MKI Lightspeed Attenuators were recalled and all upgraded to MKII status, and everyone of the owners said it was a vast improvement, except for one, who said now it is not very tolerant of hard sounding equipment anymore, that to me is a plus.
The MKI (series resistor/shut ldr) has a varying input impedance presented to the source and also a varying output impedance presented to the input of the amplifier, it also has a lot louder minimum volume, all these factors contribute to the reduction in sound performance/quality, also from memory it has a lot higher second harmonic distortion to it, that may be the reason for it's veiled thicker sound.
I think back in this thread a way I posted the distortion figures from Silonex on the difference between the MKI and MKII, and for a typical 1-2 volt input from a cd player and the MKI system had far greater 2HD distortion figure to that of the MKII version.
I wish I could have still made the MKI because it was so much less time consuming to make, but it is comprimised, and that won't do.

Cheers George
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Old 29th April 2008, 10:44 AM   #1277
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This is the post that gives the 2HD figures at CD (2v) input level for the MKI and the MKII configurations, as you can see the MKII has far less 2HD than the MKI.
http://www.diyaudio.com/forums/showt...65#post1399965

Cheers George
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Old 29th April 2008, 12:18 PM   #1278
Tolu is offline Tolu  Germany
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Hi George

you are absolutely right. I haven't seen that the OptiVol is comparable to LS MkI.

I am very happy with my series/shunt version (mkII in your language ). Yesterday I have heard a new CD of Tord Gustafsen Trio - The Ground. The first minutes I was a little bit disappointed about the music but after 20 minutes the music began to fly. I am not sure if the reason was the warm-up perdiod of my power amp, the Chianti or a possible warm-up of the LS. Is there some kind of warm-up necessary for the LS? I have seen the Silonex parts have a high temperature dependancy (0,7%/C).

My amp has 47k input impedance but my new one will have 262k so I am very excited how it fits with the LS. One problem is the low output power of my well sounding Playstation 1 of just 1.4 Veff. Some CDs have low recording level so the LS pot is at 70% to get a satisfying volume. I think I will optionally try the FET BOZ of John65. Haven't you wrote somewhere in this thread that Nelson Pass will develop a buffer for the LS?

Another question to the Silonex parts. All optocouplers of Silonex have no RoHS compliance. So, these parts are not legally allowed for manufacturers in the EU. Are there any substitutes with RoHS compliance on the market?
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Old 29th April 2008, 09:28 PM   #1279
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Tolu hi,
The Lightspeed 's as I build them do like them to be left on 24/7, but with the volume control left at mid position when not in use.
As it is in this warmed up state that the channels are balanced out in the final calibration stage of the manufacture, when cold they can be out by a few db, this could be what you heard, bad imaging.

And sorry but there is no substitute for the NSL32R2S, that does the same job without some sort of negative compromise

And there will be a new DIY discrete buffer designed by none other than Nelson Pass for the Lightspeed soon, and this will solve any impedance mismatch problems with low input impedance power amps, here are the Links to the new Pass buffer reply.

http://www.diyaudio.com/forums/showt...09#post1464609

http://www.diyaudio.com/forums/showt...15#post1465015

Cheers George
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Old 2nd May 2008, 07:04 PM   #1280
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George has taken to nagging me on when the buffer will be
out.

Patience.

The work is done, the graphs are all labeled, but the article is
still being written.

The piece is not a focus on the Lightspeed Attenuator (tm),
rather it deals with some arcane aspects of optimizing the
performance of discrete buffers. I'm sure you will find it useful.
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