Matched LDRs for Lightspeed Attenuator

udailey · 14th February 2009, 12:43 AM

LDRs Matched Sets Post #1678
Guys/Gals
I bought 125 LDRs. Was thinking on a equalizer but its not going to happen.
I have many matched sets and would sell them to you if you are interested. Email me for 4.
All are silonex nsl-32sr2
http://www.alliedelec.com/Search/Pro...ESC=NSL-32SR2S
http://www.alliedelec.com/Images/Pro...ES_6993011.PDF
http://www1.silonex.com/audiohm/levelcontrol.html

Process:
I placed them in a jig and ran voltage in through 100, 9.96k, 22.1k, 47k resistors each for about 10minutes placing the next resistor in series before removing the previous to make sure the LED never turned off. I wrote down each reading and entered into a spreadsheet. Made a graph and selected the best matches. I bagged and tagged each set of two pairs and am now halfway through putting each set of pairs into another test jig to listen to them and make sure that they are in fact matched. So far I am having stellar success with great matching.
After including the work on building the jigs, testing, entering data, testing again, placing and removing from jig I estimate each LDR has taken me well over an hour to test. I think I need a more efficient method!
If you are interested let me know by email.

Uriah

udailey · 14th February 2009, 12:45 AM

Price is 30 for 4 which will make one Lightspeed Attenuator.
In the US shipping is 1.60 and paypal fees make the total 32.85 US.
I will ship these international if you want. Obviously shipping fees will be different but shipping to Canada today was 2.62 so not bad at all.
Uriah

tritosine · 15th February 2009, 06:01 AM

i might be interested will tell you tomorrow (sunday)

EUVL · 15th February 2009, 06:18 AM

How well matched ?
Within 0.25dB on all test settings ?

Patrick

EUVL · 17th February 2009, 01:38 AM

It was a serious question, and I thinkit deserves an answer, doesn't it ?

Patrick

tritosine · 17th February 2009, 05:39 AM

he might turned off the subsription to his own thread , as he suggested to use his email adress. And btw theres this kit stuff happening in that LDR thread i might go for , so I wont need another set?

udailey · 17th February 2009, 11:56 AM

Patrick, I am here. I already explained how I did my testing and it has nothing to do with .25db. I have no idea how to figure .25db and would but I could ever hear .25db.
I am at this point sold out of LDRs however I have purchased another 100 because I have had several subsequent requests for matched pairs.
I include the test results to whoever buys them and they can make up their mind if they want the pair. If you are interested I can give you the results of a few pair later this week or weekend and you may put the results in the algorithm to find out if they meet your needs.
Uriah

14th February 2009, 12:45 AM	#2
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	Price Price is 30 for 4 which will make one Lightspeed Attenuator. In the US shipping is 1.60 and paypal fees make the total 32.85 US. I will ship these international if you want. Obviously shipping fees will be different but shipping to Canada today was 2.62 so not bad at all. Uriah __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

17th February 2009, 11:56 AM	#7
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	Patrick, I am here. I already explained how I did my testing and it has nothing to do with .25db. I have no idea how to figure .25db and would but I could ever hear .25db. I am at this point sold out of LDRs however I have purchased another 100 because I have had several subsequent requests for matched pairs. I include the test results to whoever buys them and they can make up their mind if they want the pair. If you are interested I can give you the results of a few pair later this week or weekend and you may put the results in the algorithm to find out if they meet your needs. Uriah __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

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14th February 2009, 12:43 AM	#1
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	Matched LDRs for Lightspeed Attenuator LDRs Matched Sets Post #1678 Guys/Gals I bought 125 LDRs. Was thinking on a equalizer but its not going to happen. I have many matched sets and would sell them to you if you are interested. Email me for 4. All are silonex nsl-32sr2 http://www.alliedelec.com/Search/Pro...ESC=NSL-32SR2S http://www.alliedelec.com/Images/Pro...ES_6993011.PDF http://www1.silonex.com/audiohm/levelcontrol.html Process: I placed them in a jig and ran voltage in through 100, 9.96k, 22.1k, 47k resistors each for about 10minutes placing the next resistor in series before removing the previous to make sure the LED never turned off. I wrote down each reading and entered into a spreadsheet. Made a graph and selected the best matches. I bagged and tagged each set of two pairs and am now halfway through putting each set of pairs into another test jig to listen to them and make sure that they are in fact matched. So far I am having stellar success with great matching. After including the work on building the jigs, testing, entering data, testing again, placing and removing from jig I estimate each LDR has taken me well over an hour to test. I think I need a more efficient method! If you are interested let me know by email. Uriah __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

15th February 2009, 06:01 AM	#3
tritosine diyAudio Member Join Date: Aug 2008	i might be interested will tell you tomorrow (sunday)

15th February 2009, 06:18 AM	#4
EUVL diyAudio Member Join Date: Oct 2003	How well matched ? Within 0.25dB on all test settings ? Patrick

17th February 2009, 01:38 AM	#5
EUVL diyAudio Member Join Date: Oct 2003	It was a serious question, and I thinkit deserves an answer, doesn't it ? Patrick

17th February 2009, 05:39 AM	#6
tritosine diyAudio Member Join Date: Aug 2008	he might turned off the subsription to his own thread , as he suggested to use his email adress. And btw theres this kit stuff happening in that LDR thread i might go for , so I wont need another set?

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