Lightspeed Attenuator a new passive preamp

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#1,701
Terry, your Coda 03P with 150ohm output will be fine driving into the Lightspeed and Atma-Sphere M60s, the only proviso is if it will have enough voltage gain.
The way to try this is to plug the Coda 03P directly into the Atma-Sphere M60s and very carfully lower the arm onto a record you know starts off quietly, if it has enough volume for you or is too loud then the Lightspeed will work fine in this system.
If it is too quite for you, you'll need a gain stage after the Lightspeed or you can change the gain of the Atma-Sphere M60s by using a higher gain input tube or by reducing the Atma-Sphere M60s feedback a little.

Cheers George
 
#1,704
Lightspeed remote control

Hi folks,

There are now 18 people wanting VCCS boards/modules so I am going to assume that this interest will continue and place the order with the pcb manufacturer next week. Lead time is currently around 10 days from order for board shipment.

I will have to pay all the artwork, tooling and board manufacturing charges when the boards are ready so I want to see all those who have requested boards/modules send payment over the next week so I have the funds ready to pay the order. My original cost assessment has been confirmed as accurate by the board manufacturer, so I will be requiring £12 per board including the application note. This makes the module cost accurate too, at £60 built and tested, but without LDR's. Paypal payment is probably the most convenient for many of you and you can send the payment to paul@paulhynesdesign.com via the Paypal site. Those who do not have a paypal account should contact me and I will discuss alternative methods for funds transfer.

If any of you are having problems sourcing suitable infra red transmitter/receiver modules there will be boards/modules available for this function. I will advise you of costs of these shortly once I have a quote back from the board manufacturer.

Any questions, you know where I am.

Regards
Paul
 
#1,705
Lightspeed remote control

Sorry folks,

For some reason I could not edit my last post.

I forgot to post information about carriage and packaging charges for the VCCS board/module shipping. I will use the first class signed for service in the uk and international signed for airmail for europe and the rest of the world.

UK VCCS board £2.24
UK VCCS module £3.00
Europe VCCS board £5.74
Europe VCCS module £6.63
Rest of world VCCS board £6.14
Rest of world VCCS module £7.33

These carriage charges will have to be added to the board/module cost.

Also please remember to send funds in GBP (pounds sterling) as Paypal will charge me for conversion if you do not do this.

Regards
Paul
 
#1,711
Re: Lightspeed remote control

maximus said:
Hi Folks,

So far only 10 people have expressed interest in the VCCS remote control board/module for the Lightspeed. I can't believe that, like George, you are all sitting next to your volume control and would not therefore find a remote control for volume/balance of the Lightspeed useful. I need to see another 10 interested persons before I instigate a printed circuit board order.

I can report that there have been no operational anomalies occuring since installation in my system. The system is in use daily and the LDR's are burning in nicely.

This is, without doubt the finest volume control I have crossed paths with. It's uncanily adept at resolving subtle information even during large dynamic signal swings and the image remains stable as well.

Regards
Paul
Click to expand...


I'm in..

I am reading as fast as possible but haven't run across the post about a GB. May I ask for either more time to read the thread or the approximate page / post #?

I promise I'm reading!!!.....
 
#1,712
LSA Remote board

Paul,
I'm in for 2 boards and 2 IR board(s) when available. Putting cart before the horse here; haven't even built George's LSA yet, but figured I get in on this one early. I'll PayPal funds if I can verify this conversion for pounds to dollars (1 British pound = 1.4232 U.S. dollars)?. I'll send email also.

Uriah,
I'll get with you on matched LDRs.

Charles
 
#1,713
Lightspeed remote control

Hi folks,

I was half way through reading my e-mails this morning and the remaining unread ones just disappeared. I have not been able to recover them so if you have not had an answer from your e-mail today send it again. Don’t you just love computers?

Hi jkeny,

I have already e-mailed John but for those who are just starting with diy the VCCS board is just a printed circuit board and the VCCS module is the board with all the components except the LDRs and this is provided built and tested. Inexperienced constructors are less likely to get into trouble with the Module.

Hi Philip,

You need to follow the instructions in posts 1705 and 1706.

Hi agent.5,

Jh asked about having a better regulated power supply for the module. To keep the module cost at a level where interest would not be discouraged I would normally fit a 12 volt three terminal regulator and leave it up to the individual to decide whether to upgrade or not, as a high performance regulator is more expensive for the project. To give you an idea he S17LN regulator for the Buffalo costs £36. It is not on my website yet as I am still writing the latest revision. I have not yet done any trials on my VCCS board with improved regulation, as I have been a little too busy lately. When I find time for this I will report the results.

Hi Marc,

Assuming the VCCS board is sensitive to the power supply quality, and this does need to be verified before going any further in this direction, the SR1-12 stand-alone power supply is viable for this project but it adds considerably to the cost, the S17LN-12 regulator module with a simple DC power supply feeding it is a more sensible option for diy enthusiasts.

Hi Troy,

I have not got the time to go back through the thread looking for post numbers. I believe a summary of the various project options was prepared a while back so look for this first as it may save you some time.

Hi Charles

I got your mail earlier.

Regards
Paul
 
#1,714
Guys/Gals,
A family member has just been taken off of life support and we will be attending the funeral in a few days. We will be out in Minnesota, near a lot of other family and my daughter and I will be visiting other relatives after the funeral as we dont often get out to the MidWest anymore. We will be gone until the 4th.
When I get back I will get back to matching LDRs for you all and if you need some you can still email me and request them. I just wont be answering emails more often than every 3 or 4 days so if I dont respond quickly that is why.
I have orders for 15 sets of dual pairs right now. When those all get paid for I will have enough money to order a few hundred more and the matching will be incredibly tight. I plan on coming back on the 4th and having 300LDRs to match so if you have been thinking about getting some matched pairs man this is the time when I will have them closer than ever. The more you have the closer the matching gets.
Thanks
Uriah
 
#1,715
I hope Paul Hynes doesn't mind but I attach a word doc of his responses in the thread so far - this might help to answer some questions that have been asked before - I do this when there is a thread I'm interested in so as I don't have to read through a whole thread again to find out something that I know was covered
 

Attachments

#1,717
Re: Lightspeed remote control

maximus said:
Hi agent.5,

Jh asked about having a better regulated power supply for the module. To keep the module cost at a level where interest would not be discouraged I would normally fit a 12 volt three terminal regulator and leave it up to the individual to decide whether to upgrade or not, as a high performance regulator is more expensive for the project. To give you an idea he S17LN regulator for the Buffalo costs £36. It is not on my website yet as I am still writing the latest revision. I have not yet done any trials on my VCCS board with improved regulation, as I have been a little too busy lately. When I find time for this I will report the results.
Click to expand...


Thanks Paul. As the force of laziness is strong in me, I think I am going to order the tested module. I like the infra-red remote modules also. If the S17LN proves to improve things, I may as well order that as well. Have you tried using a 12V SLA battery as power supply?
 
#1,719
mk1.5

I am curious if anybody have done the comparison using
LDR as fixed resistance (like 27kohm) in the series and
LDR shunt and compare to mk1 and mk2. We can make
use of those unused LDR leaving behind after
we bought 10 or so to find matched pairs.

I named this configuration as mk1.5 if Georgehifi doesn't mind.
Since I recalled Georgehifi has tried different resistors in
mk1 and the result is worse than mk2. So I am wondering
is it because the material of LDR as resistance element better
than those hi-end resistors like Vishay S102, Nude TX2352,
TX2575, Tantalum, Caddock etc beside the rather constant
impedance in mk2.

This mk1.5 can be easiest done by setting a fixed current
through this series LDR. If there are someone has remaining
unmatched LDR, do you able to try this mk1.5 and compare to
mk2 at the same volume level?

I think I am going to order some LDRs and test it myself...just
wondering if anybody have done this exercise.

Thanks!

Philip
 
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