Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Comparison of Light Dependent Resistors
Comparison of Light Dependent Resistors
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 15th November 2010, 07:06 PM   #1
jackinnj is offline jackinnj  United States
diyAudio Member
jackinnj's Avatar
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Comparison of Light Dependent Resistors
Default Comparison of Light Dependent Resistors

I altered the current source setup with some auxiliary transistors so that it could do 100mA (the LT1990 does about 10mA). The Vactrol seems to have a slight edge on the Silonex -- into a 100K load. Of course, the Vactrol will not attain the low level resistance of the Silonex (I can get samples down around 40 ohms).

The Fairchild PhotoFET's are pretty good as well -- they are the fat surface mount so probably easier to solder up.

Click the image to open in full size.

The Perkin Elmer and Fairchild Devices aren't quite as "twitchy" as the Silonex.
  Reply With Quote
Old 16th November 2010, 07:03 PM   #2
Blues is offline Blues  United States
diyAudio Member
Blues's Avatar
Join Date: Sep 2003
Location: The Milky Way
Thanks for the data...these are really low numbers. Is it safe to say the harmonic content is insignificant above H5? If so THD of the Silonex, if my math is correct, is about 0.000275% and considering Noise at around say -140dBV will add to about 0.000282%? The other 2 devices are slightly less. Is the Silonex LDR at 40R during the test?

Any chance for the NSL-32SR2 getting tested? I very much appreciate your efforts.
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote


Comparison of Light Dependent ResistorsHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FDNR in active filters (Frequency Dependent Negative Resistor) peranders Parts 41 19th February 2011 07:23 PM
June 2010 Silonex Light Dependent Resistors udailey Group Buys 2 25th May 2010 01:41 AM
Light bulbs as cathode resistors? Jeb-D. Tubes / Valves 19 28th June 2008 02:11 PM
Technical Discussion about Frequency Dependent Terminal Impedance dkemppai Full Range 22 18th August 2005 02:32 AM
LPF function dependent on phase? Lusso5 Solid State 1 7th October 2003 08:41 PM

New To Site? Need Help?

All times are GMT. The time now is 08:46 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio