Go Back   Home > Forums > Source & Line > Analog Line Level

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

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
Reply
 
Thread Tools Search this Thread
Old 6th September 2010, 12:02 PM   #1
jotape is offline jotape  Europe
diyAudio Member
 
Join Date: Mar 2006
Location: Catalunya
Default More about LDR attenuators

Hope this design can be useful to someone.

It's an analog "quasi constant" input impedance attenuator, with adjustable output impedance.

This design requires some degree of matching L & R LDRs to avoid unbalances, and lesser matching with control net LDRs (to achieve desired impedances).

With 18 NSL-32SR2 on hand, I've build it (in fact, now it's my favourite volume's att.).
Works pretty well: Not too much unbalance, acceptable attenuation law & impedances.

Using same idea, a "quasi constant" output impedance (volume level independent) can be made.
Attached Images
File Type: png QUASI_CONSTANT_ZIN.PNG (46.5 KB, 153 views)
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
LDR Switch? markusA Analog Line Level 6 23rd February 2010 06:55 AM
LDR attenuator questions Carlp Analog Line Level 15 21st January 2010 01:01 AM
protection/limmit with ldr east electronics Solid State 9 5th November 2009 07:11 AM
LDR in Rhodes piano (help!) Magnetmaz Instruments and Amps 1 27th July 2004 06:55 AM
LED to LDR amplifier electro samurai Analogue Source 8 21st March 2004 05:07 PM


New To Site? Need Help?

All times are GMT. The time now is 09:38 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2