Lightspeed Attenuator

[alb]

Looking at the blurb, it needs a low impedance source, which probably means i couldn't use it after a tube pre.
I would have to connect the DAC output to it, which is ok, except it would then be for CD only and not be a replacement for the pot in the amp.

Perhaps not as useful as i first thought.

[Tripmaster]

Hi

Here are the parts that I used for my Lightspeed clone. Please feel free to substitute.

4 x Silonex LDR NSL-32SR3 – We puchased these by mistake...Leo...but work fine if you solder a 22R Resistor across the pot

http://uk.farnell.com/silonex/nsl-32...18?Ntt=3692218

The correct LDRs can be found at the following link
http://uk.farnell.com/silonex/nsl-32...in_merch=true&


2 x Bourns 1K Trimmers
http://uk.farnell.com/bourns/3296w-1...78?Ntt=9353178


1 x 100K Pot
http://uk.farnell.com/tyco-electroni...87?Ntt=1173987

2 x RCA Red Sockets
http://uk.farnell.com/neutrik/nys367...29?Ntt=5008529

2 x RCA White Sockets
http://uk.farnell.com/neutrik/nys367...66?Ntt=5008566


You will also require 4x 1/4w 100R resistors and a piece of 60mm x 95mm stripboard. The blue LED is optional

Power Supply

1 x 7805 5v regulator
http://uk.farnell.com/stmicroelectro...0-3/dp/1087086

1 x 10uf Capacitor (All they have in stock)
http://uk.farnell.com/panasonic/eeuf...50v/dp/9692363

2 x 0.1uf Capacitors
http://uk.farnell.com/wima/mks2-0-1u...63v/dp/1006030

Case

http://www.maplin.co.uk/Search.aspx?...mond&source=15


I hope this helps

[leo]

Hi

Here are the parts that I used for my Lightspeed clone. Please feel free to substitute.

4 x Silonex LDR NSL-32SR3 – We puchased these by mistake...Leo...but work fine if you solder a 22R Resistor across the pot

http://uk.farnell.com/silonex/nsl-32...18?Ntt=3692218

The correct LDRs can be found at the following link
http://uk.farnell.com/silonex/nsl-32...in_merch=true&


2 x Bourns 1K Trimmers
http://uk.farnell.com/bourns/3296w-1...78?Ntt=9353178


1 x 100K Pot
http://uk.farnell.com/tyco-electroni...87?Ntt=1173987

2 x RCA Red Sockets
http://uk.farnell.com/neutrik/nys367...29?Ntt=5008529

2 x RCA White Sockets
http://uk.farnell.com/neutrik/nys367...66?Ntt=5008566


You will also require 4x 1/4w 100R resistors and a piece of 60mm x 95mm stripboard. The blue LED is optional

Power Supply

1 x 7805 5v regulator
http://uk.farnell.com/stmicroelectro...0-3/dp/1087086

1 x 10uf Capacitor (All they have in stock)
http://uk.farnell.com/panasonic/eeuf...50v/dp/9692363

2 x 0.1uf Capacitors
http://uk.farnell.com/wima/mks2-0-1u...63v/dp/1006030

Case

http://www.maplin.co.uk/Search.aspx?...mond&source=15


I hope this helps

Nice one!
The NSL-32SR3 was my fault for just quick searching to try and find the order codes, I don't often make too many errors , honest

[aquapiranha]

Hi

Here are the parts that I used for my Lightspeed clone. Please feel free to substitute.

4 x Silonex LDR NSL-32SR3 – We puchased these by mistake...Leo...but work fine if you solder a 22R Resistor across the pot

http://uk.farnell.com/silonex/nsl-32...18?Ntt=3692218

The correct LDRs can be found at the following link
http://uk.farnell.com/silonex/nsl-32...in_merch=true&


2 x Bourns 1K Trimmers
http://uk.farnell.com/bourns/3296w-1...78?Ntt=9353178


1 x 100K Pot
http://uk.farnell.com/tyco-electroni...87?Ntt=1173987

2 x RCA Red Sockets
http://uk.farnell.com/neutrik/nys367...29?Ntt=5008529

2 x RCA White Sockets
http://uk.farnell.com/neutrik/nys367...66?Ntt=5008566


You will also require 4x 1/4w 100R resistors and a piece of 60mm x 95mm stripboard. The blue LED is optional

Power Supply

1 x 7805 5v regulator
http://uk.farnell.com/stmicroelectro...0-3/dp/1087086

1 x 10uf Capacitor (All they have in stock)
http://uk.farnell.com/panasonic/eeuf...50v/dp/9692363

2 x 0.1uf Capacitors
http://uk.farnell.com/wima/mks2-0-1u...63v/dp/1006030

Case

http://www.maplin.co.uk/Search.aspx?...mond&source=15


I hope this helps

Richard, thanks for taking the time and trouble to list all the parts. I am sure I am not the only one who is very grateful. I hope I can build one before Christmas.

Steve

[Tripmaster]

Its the least I could do considering the help I have received in the past

[Tripmaster]

It might be worth sourcing an alternative 100k pot as I find its shaft a bit thick (so to speak)

[sondale]

One thing to consider is that the LSA likes a high impedance (50k+) amplifier on its output; because of this I (and a lot of others) use a Nelson Pass B1 buffer with the volume control replaced by an LSA.

On DIYAudio there is a new version of this buffer coming out soon - I will let you know how that goes with the LSA.

I cannot say I have had any problems on the input side - vinyl / digital - no mismatches.

Someone posted earlier about using a battery - I use SLA'a for both the LSA (2 x 6 volt) and the B1 (3 x 6 volts) - they last at least a week.

All in all this is the best pre-amp I have had in my system.

[The Vinyl Adventure]

pufin: tripmaster mentions a 22r resistor across the pot... is that what will fix mine? (im yet to find the time to get to maplins hence no feedback from me yet)

while i have your atention... the earth fix on the gainclones did nothing.. when i recase them i will post on here for ferther advice i think!

[Tripmaster]

pufin: tripmaster mentions a 22r resistor across the pot... is that what will fix mine? (im yet to find the time to get to maplins hence no feedback from me yet)

while i have your atention... the earth fix on the gainclones did nothing.. when i recase them i will post on here for ferther advice i think!

Hi Hamish

By soldering 22r resistor across the pot will make the volume control at little less sudden. You can always try a slightly higher value if you find the 22r not to your liking. Give it a go it will only take 5 mins

[The Vinyl Adventure]

at the moment im getting a lot of volume even at zero on the pot? will that fix that?

make it simple guys... rob made it so i dont really know what im doing