A better formula for Silonex LDR's - diyAudio
 A better formula for Silonex LDR's
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 5th November 2010, 06:29 PM #1 diyAudio Member     Join Date: Apr 2002 Location: Llanddewi Brefi, NJ A better formula for Silonex LDR's I plugged in about 100 data points for Current (x) and ON-Resistance (y) for the Silonex NSL32SR3 Attenuator -- the errors for the very low currents are close to zero -- This is much better than the results using the Silonex equations. Here's the equation - ymmv: __________________ Why, silly hare, are you fleeing from the fierce jaws of the lion now grown tame?
 5th November 2010, 06:46 PM #2 diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders Can I assume that e5 = 10^5? __________________ regards Andrew T. Sent from my desktop computer using a keyboard
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Quote:
 Originally Posted by AndrewT Can I assume that e5 = 10^5?
Yep, that is the notational custom - as I know it at least

 5th November 2010, 06:55 PM #4 diyAudio Member     Join Date: Apr 2002 Location: Llanddewi Brefi, NJ I liked it because there is no exponentiation, and only a few terms. The equations with multiple terms offer no improvement in accuracy. A stepwise approximation can probably resolve the low ohms error. __________________ Why, silly hare, are you fleeing from the fierce jaws of the lion now grown tame?
 5th November 2010, 07:38 PM #5 diyAudio Member   Join Date: Mar 2008 How many different LDRs is this based on John? One with 100 measurements or several with several measurements? Yeah, their datasheet is nothing close to real use. Uriah __________________ purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com
 5th November 2010, 09:07 PM #6 diyAudio Member     Join Date: Sep 2003 Location: The Milky Way Nice one Jack...btw, x=current in uA. Actual testing/matching is still the way to go but it can serve as cross reference. __________________ Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
 5th November 2010, 09:17 PM #7 diyAudio Member     Join Date: Sep 2003 Location: The Milky Way On second thought...your formula is pegged down at 47R...it certainly can go lower __________________ Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
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Quote:
 Originally Posted by Blues On second thought...your formula is pegged down at 47R...it certainly can go lower
the very low resistance points are the insertion loss.

do the math for a 0.5dB 100K+100K attenuator -- you need accuracy in the tens of picoamps in the part of the range where we do most of our listening.
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Join Date: Sep 2003
Location: The Milky Way
Quote:
 Originally Posted by Blues On second thought...your formula is pegged down at 47R...it certainly can go lower
And can also go much higher, I might add, and controllable too.

Quote:
 Originally Posted by jackinnj the very low resistance points are the insertion loss. do the math for a 0.5dB 100K+100K attenuator -- you need accuracy in the tens of picoamps in the part of the range where we do most of our listening.
Not quite...with a more precise power delivery "engine" . Listening range is mostly in 10s of uA to 100s of uA. With this design working range is from <1uA thru 10s of mA.

I'll probably start a thread...
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 12th November 2010, 04:19 PM #10 diyAudio Member     Join Date: Apr 2002 Location: Llanddewi Brefi, NJ Several forms of equations will work -- but I have to say that the Silonex devices are all over the place! Here's my setup -- using an LTC or ADI difference amp allows stable current in the picoAmperes: __________________ Why, silly hare, are you fleeing from the fierce jaws of the lion now grown tame?

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