Capacitor in parallel with negative feedback resistor
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

 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
 16th April 2011, 07:15 PM #1 Tyimo   diyAudio Member   Join Date: Nov 2002 Location: Hungary Capacitor in parallel with negative feedback resistor Hi! Is there any rule how to use it and how to calculate this capacitor's value? Greets: Tyimo
 16th April 2011, 07:21 PM #2 DF96   diyAudio Member   Join Date: May 2007 This capacitor usually has two functions: 1. set the closed-loop HF roll-off 2. add some phase advance to aid loop stability The first one is easy to calculate, as it is a normal CR response (near enough). The second depends on several other things, including stray capacitances so difficult to calculate. Some people use a third option: 3. adjust to get a 'good' square wave response
Tyimo
diyAudio Member

Join Date: Nov 2002
Location: Hungary
Thanks!
Could you give me the equation of the closed-loop HF roll-off?

Quote:
 The first one is easy to calculate, as it is a normal CR response (near enough).
Do you mean this?: 1/(C*R*2PI) = )=-3dB rolloff point

Last edited by Tyimo; 16th April 2011 at 07:53 PM.

 16th April 2011, 08:17 PM #4 jcx   diyAudio Member   Join Date: Feb 2003 Location: .. figuring out where to put the corner frequency is a little more complex Nyquist, Bode worked out the theory ~70 years ago
 16th April 2011, 08:33 PM #5 DF96   diyAudio Member   Join Date: May 2007 Yes, the equation is easy - deciding what to put in it is the hard part! I assume the OP is not familiar with loop stability theory?

 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 Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         Dx Classic Amplifiers         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post Binaural Tubes / Valves 15 12th March 2009 07:05 PM CarlosT Chip Amps 25 14th December 2006 10:18 PM Jack Thomas Tubes / Valves 6 5th May 2003 12:38 AM Solid Snake Solid State 33 14th March 2003 01:29 PM

 New To Site? Need Help?

All times are GMT. The time now is 04:31 AM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki